Place · Level 3 · Condition
Menstrual Cycle · Period Care
HPO 轴 4 期 · FIGO 正常上限 · 前列腺素 → NSAID 时机窗 · PMDD vs PMS · 经前/中/后三段实操 · 经期禁忌拆穿
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Chapter 1
4 phases · HPO axis
4 phases · HPO axis
Menstruation is not "the uterus performing on its own" — it is the hypothalamus → pituitary → ovary → endometrium four-tier choreography, a precise chemical relay reset every month. Understanding this axis = understanding the source of all the pain / mood / bleeding changes that follow.
1. The HPO axis (Hypothalamic-Pituitary-Ovarian):
Hypothalamus: pulsatile GnRH (gonadotropin-releasing hormone) secretion — the master metronomeAnterior pituitary: receives GnRH → secretes FSH (follicle-stimulating hormone) + LH (luteinizing hormone)Ovary: receives FSH/LH → follicle development + secretes estradiol (E2) + progesterone (P)Endometrium + systemic tissues: receive E2/P → proliferation / differentiation / shedding + systemic effects (mood / temperature / sleep / sebum / appetite)Feedback loop: at moderate-high levels E2, positive feedback triggers the LH surge (the chemical trigger of ovulation); during the luteal phase, E2/P provide negative feedback suppressing GnRH
2. The 4 phases of a standard 28-day cycle (counting from Day 1 of menstruation):
Menstrual phase (Day 1-5): endometrium sheds + bleeds; FSH has quietly begun rising, recruiting the next cycle's follicleFollicular phase (Day 1-13): FSH ↑ → follicle development + gradually rising E2; endometrium proliferates (proliferative phase)Ovulation (Day 13-15): E2 peaks → positive feedback triggers the LH surge → follicle rupture and ovulation within 24-36 h; basal body temperature (BBT) rises 0.3-0.5 °C afterwardsLuteal phase (Day 15-28): the ovulated follicle collapses into the corpus luteum → secretes P + some E2; endometrium differentiates (secretory phase) to prepare for possible implantation; lasts a fixed ~ 14 ± 2 days — the physiological limit of the corpus luteum
3. Key concept: the luteal phase is fixed; almost all cycle-length variation is in the follicular phase:
Normal cycle length range: 21-35 days (FIGO 2018 / Munro)A woman with a 35-day cycle is not "long-cycle," she has a long follicular phase; the luteal phase is still ~ 14 daysA 21-day cycle is not "a problem," just a short follicular phasePractical value: to estimate ovulation / pre-menstrual phase, count back 14 days from the predicted next period — more accurate than "Day 14"
The next pages cover the evolutionary logic of menstruation + the atlas perspective on "detox blood", the cycle's influence on whole-body rhythms (BBT / sleep / appetite / sebum), and the FIGO quantification of "is anything other than 28 days abnormal?".
1. The HPO axis (Hypothalamic-Pituitary-Ovarian):
Hypothalamus: pulsatile GnRH (gonadotropin-releasing hormone) secretion — the master metronomeAnterior pituitary: receives GnRH → secretes FSH (follicle-stimulating hormone) + LH (luteinizing hormone)Ovary: receives FSH/LH → follicle development + secretes estradiol (E2) + progesterone (P)Endometrium + systemic tissues: receive E2/P → proliferation / differentiation / shedding + systemic effects (mood / temperature / sleep / sebum / appetite)Feedback loop: at moderate-high levels E2, positive feedback triggers the LH surge (the chemical trigger of ovulation); during the luteal phase, E2/P provide negative feedback suppressing GnRH
2. The 4 phases of a standard 28-day cycle (counting from Day 1 of menstruation):
Menstrual phase (Day 1-5): endometrium sheds + bleeds; FSH has quietly begun rising, recruiting the next cycle's follicleFollicular phase (Day 1-13): FSH ↑ → follicle development + gradually rising E2; endometrium proliferates (proliferative phase)Ovulation (Day 13-15): E2 peaks → positive feedback triggers the LH surge → follicle rupture and ovulation within 24-36 h; basal body temperature (BBT) rises 0.3-0.5 °C afterwardsLuteal phase (Day 15-28): the ovulated follicle collapses into the corpus luteum → secretes P + some E2; endometrium differentiates (secretory phase) to prepare for possible implantation; lasts a fixed ~ 14 ± 2 days — the physiological limit of the corpus luteum
3. Key concept: the luteal phase is fixed; almost all cycle-length variation is in the follicular phase:
Normal cycle length range: 21-35 days (FIGO 2018 / Munro)A woman with a 35-day cycle is not "long-cycle," she has a long follicular phase; the luteal phase is still ~ 14 daysA 21-day cycle is not "a problem," just a short follicular phasePractical value: to estimate ovulation / pre-menstrual phase, count back 14 days from the predicted next period — more accurate than "Day 14"
The next pages cover the evolutionary logic of menstruation + the atlas perspective on "detox blood", the cycle's influence on whole-body rhythms (BBT / sleep / appetite / sebum), and the FIGO quantification of "is anything other than 28 days abnormal?".
Evolution + body rhythms
4. Why menstruation at all? (the evolutionary logic of endometrial shedding)Most mammals do not menstruate — their endometrium is resorbed rather than shed when pregnancy doesn't occurHumans + primates + bats + elephant shrews show "spontaneous decidualization": the endometrium differentiates into decidua during the luteal phase even without an embryoResult: P withdrawal (corpus luteum apoptosis) → decidualized endometrium cannot simply revert → ischemia + shedding + bleeding = menstruationEvolutionary hypothesis (Emera 2012): the human embryo's implantation is highly invasive → maternal endometrium needs to "rehearse" its defence → spontaneous decidualization → menstruation as a by-product
5. Atlas perspective: menstruation is not "detoxifying waste blood"
Menstrual fluid = endometrial tissue (~ 35-50%) + blood (~ 30-50%) + cervical mucus + vaginal microbiome metabolitesContains no toxins, and does not need to be "flushed clean" — one of the most common cognitive errors in Chinese internet discourseThe mystification of "menstrual blood colour = a health indicator" is overdone — colour is primarily affected by oxidation time (bright red = fresh / dark or brown = oxidised), not directly mapping to "cold-dampness" or "toxins"
6. The cycle and whole-body rhythms
Basal body temperature (BBT): rises 0.3-0.5 °C in the luteal phase → can confirm ovulation (but cannot predict it)Core-temperature threshold: narrowed in the luteal phase → the same room temperature feels warmer (some shared pathway with KNDy neurons, see the perimenopause island)Sleep architecture: in late luteal phase REM ↓ + awakenings ↑ (allopregnanolone, a P metabolite, is a GABA modulator — early helpful for sleep, late rebound)Appetite + preference: luteal energy intake rises — mean across 19 studies ~1.0 MJ/day (≈240 kcal), with individual studies above 2.5 MJ/day (Buffenstein 1995 review) — with a pull toward carbs + fatSebum + acne: post-ovulation P ↑ → sebaceous gland activity → acne peak 3-5 days pre-menstrualBreasts: late-luteal proliferation → tenderness, a normal P effect
Bottom line: menstruation is not "an inconvenience to endure" or "mystical feminine energy" — it is an endocrine process that can be understood, measured, and intervened upon. The next 5 scenes turn that understanding into actionable tools.
Is non-28 abnormal?
"A normal cycle is 28 days" is a common misconception.FIGO 2018 / ACOG 2023 normal ranges:
Cycle length: 21-35 days (up to 45 days in the first 5 years post-menarche, can shorten to 17 days in perimenopause)Period duration: 2-7 daysBlood volume: 5-80 mL (Hallberg 1966 classic; > 80 mL = heavy menstrual bleeding, HMB)Cycle-to-cycle variation: a difference of ≤ 7-9 days between adjacent cycles is normal
True abnormality signals (next scene details):
< 21 days or > 35 days for ≥ 3 consecutive cyclesPeriod > 7 days or < 2 daysSubjective sense of substantially heavier flow (saturating 1 pad per hour / large clots) — semi-quantify with the PBAC scoreIntermenstrual bleedingPostcoital bleedingAmenorrhea (no menses for 3+ months) without pregnancy / breastfeeding
Common physiological causes of irregularity (not necessarily disease):
First 2-5 years post-menarche: immature HPO axis; anovulatory cycles commonPerimenopause (45+): HPO rhythm dysregulation, see atlas perimenopause islandStress (hypothalamic–pituitary–adrenal axis: The body's stress-response chain (hypothalamus → pituitary → adrenal) that releases cortisol. → HPO suppression): acute / chronic stress delays ovulationEnergy deficit: dieting / heavy training + low intake → functional hypothalamic amenorrhea (FHA), see sarcopenia + low energy availability literatureSharp weight changes: rapid loss of 10% body weight or sudden gain → cycle disturbanceTime-zone changes + shift work: see atlas shift-work-circadian island
Practical value of cycle tracking
A 3-6 cycle log = the cheapest diagnostic tool (more informative than any single blood hormone draw)Required: period start date / duration / volume (light / medium / heavy) / pain (0-10) / abnormal bleeding / key symptoms (PMS / mood / headache)Optional: basal body temperature (measured upon waking before getting up) + cervical mucus (Billings method) → for fertility awareness in conception planning, not a standalone contraceptiveApps: Clue / Flo / Apple Health built-in — for privacy prefer locally-stored apps; be cautious of cross-border data (since Roe v. Wade, US courts have subpoenaed data in some states)
buffenstein-1995-menstrual-intakeemera-2012-evolution-menstruation
Chapter 2
Normal vs AUB
Normal vs AUB
"Can my period wait to be checked" is one of the most-deferred medical decisions. Let's quantify it using FIGO 2018 PALM-COEIN — the global gynaecology common language.
1. PALM-COEIN: 9 causes of abnormal uterine bleeding (AUB) (Munro 2018)
PALM (structural, visible on imaging):
P olyp — endometrial or cervical polypA denomyosis — endometrium invading myometriumL eiomyoma — uterine fibroid (FIGO L0-L7 sub-classification)M alignancy — endometrial / cervical cancer or precancer
COEIN (non-structural):
C oagulopathy — most commonly vWD, highly underdiagnosed — 13% of women with severe HMB have vWDO vulatory dysfunction — PCOS / hypothyroidism / hyperprolactinemia / stress-related FHAE ndometrial — local endometrial factors (endometritis / prostaglandin imbalance)I atrogenic — hormonal IUD / anticoagulants / chemotherapyN ot otherwise classified
2. Quantifying menstrual bleeding: is your "a lot" actually a lot?
80 mL/cycle is the evidence-based threshold for HMB — it comes from Hallberg 1966, a population study that measured actual blood loss and then asked where normal stops80 mL = 16 fully soaked standard pads or 8 fully soaked super-absorbent padsPrecise daily quantification is hard → use PBAC (Pictorial Blood Loss Assessment Chart):Lightly soaked pad = 1 pointModerately soaked = 5 pointsFully soaked = 20 pointsPBAC ≥ 100 points/cycle ≈ 80 mL ≈ HMBQuick subjective signs: "saturating one standard pad per hour for 2+ hours" / "need to change during the night" / "large clots > 2.5 cm" → suggest HMB
The next page covers tiered red flags (ER / this-month), the real cost of "just endure it", and the standard work-up checklist for an abnormal-bleeding visit.
1. PALM-COEIN: 9 causes of abnormal uterine bleeding (AUB) (Munro 2018)
PALM (structural, visible on imaging):
P olyp — endometrial or cervical polypA denomyosis — endometrium invading myometriumL eiomyoma — uterine fibroid (FIGO L0-L7 sub-classification)M alignancy — endometrial / cervical cancer or precancer
COEIN (non-structural):
C oagulopathy — most commonly vWD, highly underdiagnosed — 13% of women with severe HMB have vWDO vulatory dysfunction — PCOS / hypothyroidism / hyperprolactinemia / stress-related FHAE ndometrial — local endometrial factors (endometritis / prostaglandin imbalance)I atrogenic — hormonal IUD / anticoagulants / chemotherapyN ot otherwise classified
2. Quantifying menstrual bleeding: is your "a lot" actually a lot?
80 mL/cycle is the evidence-based threshold for HMB — it comes from Hallberg 1966, a population study that measured actual blood loss and then asked where normal stops80 mL = 16 fully soaked standard pads or 8 fully soaked super-absorbent padsPrecise daily quantification is hard → use PBAC (Pictorial Blood Loss Assessment Chart):Lightly soaked pad = 1 pointModerately soaked = 5 pointsFully soaked = 20 pointsPBAC ≥ 100 points/cycle ≈ 80 mL ≈ HMBQuick subjective signs: "saturating one standard pad per hour for 2+ hours" / "need to change during the night" / "large clots > 2.5 cm" → suggest HMB
The next page covers tiered red flags (ER / this-month), the real cost of "just endure it", and the standard work-up checklist for an abnormal-bleeding visit.
Red flags + impact + work-up
3. Red flags — see these → gynaecology without delayAcute (this week):
Abnormal heavy bleeding + dizziness / ↑ HR / pallor → ER, rule out decompensated anemiaAny vaginal bleeding during pregnancySevere postcoital bleedingUnexplained abdominal mass + cycle disturbance
Subacute (this month):
Cycle > 35 days or < 21 days for ≥ 3 cyclesPeriod > 7 daysRecurrent postcoital bleedingIntermenstrual bleeding (outside the ovulatory spotting window)Any postmenopausal vaginal bleeding — highest priority to rule out endometrial cancerSevere dysmenorrhea + NSAIDs ineffective + impacting work/school → screen for endometriosisAmenorrhea > 3 months (exclude pregnancy)Heavy menstrual bleeding + easy bruising / nosebleeds / gum bleeding → coagulopathy screen (vWD!)
4. Don't underestimate "period impacts life"
Nnoaham 2011 multi-country cohort: endometriosis average misdiagnosis delay 7-10 years — many women are told "period pain is normal, endure it" until infertility work-up finally finds itHMB → iron-deficiency anemia → chronic fatigue + cognition + work efficiency — chronically "tired" women should first rule out HMB + check ferritin (see atlas iron island)Period symptoms cost a mean of 8.9 lost productivity DAYS per year (Schoep 2019 BMJ Open, N=32,748) — mostly not absence (mean 1.3 days) but presenteeism: 80.7% worked through it, a mean 23.2 days a year at roughly a third off their output"Endure it" is not a moral virtue, it is the cost of information asymmetry
5. Standard work-up checklist (common at first AUB visit)
Must: pregnancy test (β-hCG) → exclude pregnancy / ectopicCBC + ferritin + thyroid-stimulating hormone: A pituitary hormone that prods the thyroid to work — it rises when the thyroid is underactive. + PRL (prolactin)Coagulation panel + vWF antigen + activity (especially adolescent HMB since menarche)Pelvic ultrasound (transvaginal preferred) — fibroids / polyps / endometrial thickness / ovariesAs needed: hysteroscopy (polyp / endometrial cancer) + endometrial biopsy (45+ HMB / endometrium > 11 mm postmenopausal) + MRI (deep adenomyosis + complex endometriosis)
Bottom line: medical decisions about abnormal periods do not require heroism. "Endure" is not a virtue — "quantify + check early" is.
schoep-2019-bmjopen-productivity
Chapter 3
Primary dysmenorrhea · PG
Primary dysmenorrhea · PG
Dysmenorrhea splits into two types with completely different management:
Primary dysmenorrhea: no organic pathology, functional pain driven by prostaglandins — affects ~ 45-95% of reproductive-age women (Iacovides 2015), peaks in adolescence and early 20sSecondary dysmenorrhea: organic disease (endometriosis / fibroid / adenomyosis / PID) — usually new-onset after 25; new/escalating pain. See next scene.
This scene covers the chemistry of primary dysmenorrhea, one of the cleanest "understand the mechanism → use medication precisely" cases on the atlas.
1. The chemical root: PGF2α + PGE2 surge on cycle days 1-2
Corpus luteum apoptosis → P withdrawal → endometrial lysosome release → phospholipase A2 cleaves phospholipids → arachidonic acid (AA)AA → COX-2 → PGF2α + PGE2 mass synthesis (Iacovides 2015)Endometrial PGF2α rises to 3-7× follicular-phase levels on cycle days 1-2PGF2α actions:Strong uterine smooth-muscle contraction → intrauterine pressure ↑ to ~ 150-180 mmHg (normal < 80) → ↓ blood supply → uterine ischemic pain (same mechanism as angina)Sensitises peripheral nociceptors → ↓ pain thresholdPGE2 drives systemic symptoms: nausea / vomiting / diarrhea / headache
Primary dysmenorrhea: no organic pathology, functional pain driven by prostaglandins — affects ~ 45-95% of reproductive-age women (Iacovides 2015), peaks in adolescence and early 20sSecondary dysmenorrhea: organic disease (endometriosis / fibroid / adenomyosis / PID) — usually new-onset after 25; new/escalating pain. See next scene.
This scene covers the chemistry of primary dysmenorrhea, one of the cleanest "understand the mechanism → use medication precisely" cases on the atlas.
1. The chemical root: PGF2α + PGE2 surge on cycle days 1-2
Corpus luteum apoptosis → P withdrawal → endometrial lysosome release → phospholipase A2 cleaves phospholipids → arachidonic acid (AA)AA → COX-2 → PGF2α + PGE2 mass synthesis (Iacovides 2015)Endometrial PGF2α rises to 3-7× follicular-phase levels on cycle days 1-2PGF2α actions:Strong uterine smooth-muscle contraction → intrauterine pressure ↑ to ~ 150-180 mmHg (normal < 80) → ↓ blood supply → uterine ischemic pain (same mechanism as angina)Sensitises peripheral nociceptors → ↓ pain thresholdPGE2 drives systemic symptoms: nausea / vomiting / diarrhea / headache
NSAIDs first-line + timing
2. Why NSAIDs are first-line (Marjoribanks 2015 Cochrane, Level A)NSAIDs = non-selective COX inhibitors (ibuprofen / naproxen / diclofenac) or selective COX-2 inhibitors (celecoxib)Directly block the AA → PG pathway = target the rootvs acetaminophen (Tylenol): NSAIDs are substantially more effective (Marjoribanks 2015)NNT (number needed to treat): ibuprofen 400 mg vs placebo = 2.4 (a hallmark of a highly effective drug)
3. The critical timing window (this is what many women first learn on the atlas)
"Wait until it hurts to take a pill" is too late — PGs already released + pain sensitisation in progressCorrect approach: start 1-2 days before the expected period + take regularly for 2 days into the period, maintaining blood levels → prevent PG accumulationIbuprofen: 400 mg every 6 hours during the worst days 1-3 (total OTC ceiling 2400 mg/day)Naproxen: 500 mg loading → 250-500 mg every 8-12 hoursMefenamic acid: COX inhibitor + PG-receptor antagonist; some studies favour it over ibuprofen, but slightly more GI side effectsAfter 2-3 days: PG peak has passed, switch to PRN
Side effects + contraindications
4. NSAID side effects + contraindications (don't ignore)Duration caveat (ACOG / FDA OTC labels): OTC NSAIDs per cycle should not exceed 3-5 consecutive days; typical dysmenorrhea window = start 1-2 days pre-menses + 2-3 days into the period, 3-4 days total covers the PG peak. If > 5 days are still needed → gynaecology evaluation of underlying cause + consider COC / LNG-IUD, not continued NSAIDsGI: taken with food + short courses, risk is low; long-term / high-dose → gastric mucosa damage + ulcerRenal: PG inhibition → afferent arteriole vasoconstriction → transient ↓ GFR; caution in CKD + dehydration + hypertension + elderlyCV: selective COX-2 inhibitors + high-dose long-term → ↑ CV risk (FDA black box); short-term cycle use is very low-riskCoagulation: COX-1 inhibition → ↓ platelet TXA2 → ↑ bleeding risk (in short-term cycle use this actually reduces menstrual blood loss by 20-30%, a double benefit)Absolute contraindications: active GI ulcer / severe renal impairment / aspirin-induced asthma / NSAID allergyRelative: pregnancy (especially late) / breastfeeding (short OK) / concurrent anticoagulant
Alternatives + myths
5. What if NSAIDs are ineffective or contraindicated?Heat therapy (40-44 °C, 4-6 hours) — Akin 2001 OBGYN RCT: equivalent to mefenamic acid + synergistic when combinedTENS (transcutaneous electrical nerve stimulation): Level B, an option for recurrent episodesHormonal:Combined oral contraceptive (COC): suppresses ovulation + thins endometrium → ↓ PG → dysmenorrhea ↓ 70-90%LNG-IUD (Mirena): HMB ↓ 70-95% over 5 years, marked dysmenorrhea reductionSuited to: NSAIDs ineffective / also needs contraception / HMB + dysmenorrheaGnRH agonist + add-back hormone: severe endometriosis / adenomyosis, gynaecology decisionSurgery: extreme endometriosis / large fibroid / adenomyosis → laparoscopic evaluation
6. Common misconceptions
"NSAIDs stop your period": wrong, NSAIDs don't affect ovulation / cycle, and actually slightly reduce flow"Long-term NSAID use is addictive": wrong, NSAIDs are not opioids, not addictive"Period pain is good → detoxifies": wrong, dysmenorrhea = PG over-activity, no "toxins" expelled"Dysmenorrhea improves after childbirth": half true — some primary dysmenorrhea improves after delivery (pelvic nerve + endometrial remodelling), but secondary dysmenorrhea (endometriosis) may worsen
Atlas connections: fats-omega-3 (PG pathway) + magnesium/relax (uterine smooth-muscle relaxation) + vitamin-b6 + vitamin-d.
Secondary + endo screening
Secondary dysmenorrhea = period pain hiding an organic disease, with a completely different management strategy from primary.Common causes + their features:
Endometriosis:Ectopic endometrial tissue (ovary / pelvis / pouch of Douglas) bleeds + inflames + adheres with the cycleGlobal prevalence ~ 10% of reproductive-age women (Critchley 2020); estimated 6-10% in ChinaTypical: progressively worsening dysmenorrhea + dyspareunia + dyschezia + infertilityNnoaham 2011 multi-country cohort: average diagnostic delay of 7-10 years — one of the heaviest medical injustices on the atlasGold standard: laparoscopy + pathology; imaging (TVUS + MRI) can show deep lesions + ovarian endometrioma
Adenomyosis:Endometrium invading the myometrium → diffuse / focal myometrial thickeningCommon in 30-40+ multiparous womenTypical: dysmenorrhea + HMB + enlarged uterus ("early-pregnancy" appearance)Diagnosis: TVUS + MRI (T2-weighted high-signal junctional zone widening)
Leiomyoma (fibroid):Benign smooth-muscle tumorCommon 35+, earlier and more frequent in Black womenPain depends on location + size (submucosal < intramural < subserosal more painful)Main symptom: HMB > dysmenorrhea
Pelvic inflammatory disease (PID): acute / chronic, usually history of STI + fever / abnormal discharge
Cervical stenosis / uterine anomalies: outflow obstruction of menstrual blood
Red flags for secondary dysmenorrhea (different from primary)
New-onset — wasn't painful before, starts after age 25Progressively worsens — each month worse than the lastNSAIDs no longer fully relievePain not limited to cycle days 1-2 — starts 1 week pre-menses / persists outside menses / dyspareuniaAssociated symptoms — HMB / infertility / abnormal bleeding / postcoital bleeding / pain on defecation or urination
Diagnostic path
1. History + pelvic exam + pregnancy test
2. Transvaginal ultrasound (TVUS) — first-line imaging, evaluate fibroids + ovarian endometrioma + adenomyosis + endometrium
3. Pelvic MRI — deep endometriosis + complex adenomyosis + surgical planning
4. Laparoscopy + biopsy — gold standard for endometriosis; can also treat at the same time
Don't wait 7 years: persistent severe dysmenorrhea + NSAIDs ineffective + impact on life → gynaecology directly; don't be talked out of it with "period pain is normal"
Pharmacotherapy (under gynaecology guidance)
COC: suppresses ovulation + thins endometrium → first-line for most endometriosis + primary dysmenorrheaLNG-IUD (Mirena): first-line for endometriosis + adenomyosis, 5-year durationProgestin (oral / injection / SC): suppresses endometrial proliferationGnRH antagonists (elagolix / relugolix): moderate-severe endometriosis (FDA-approved 2018+), with estrogen add-back to protect boneSurgery: conservative (excision of lesions) / semi-radical (hysterectomy preserving ovaries) / radical (hysterectomy + oophorectomy) — depending on age + fertility wishes + disease
Chapter 4
PMS · PMDD · luteal mood
PMS · PMDD · luteal mood
The 5-10 days of low mood / irritability / appetite change / poor sleep before menses affect ~ 80% of women, but severity spans a huge range: from "mild and ignorable" to "functionally disabling". Split this continuum into two tiers:
1. PMS (Premenstrual Syndrome) — mild-to-moderate:
In the late luteal phase (5-10 days pre-menses), ≥ 1 mood + ≥ 1 somatic symptom appears, resolving after menses20-30% of reproductive-age women have PMSDiagnosis: prospective 2-cycle diary (retrospective is unreliable)Does not impair core work / school functioning
1. PMS (Premenstrual Syndrome) — mild-to-moderate:
In the late luteal phase (5-10 days pre-menses), ≥ 1 mood + ≥ 1 somatic symptom appears, resolving after menses20-30% of reproductive-age women have PMSDiagnosis: prospective 2-cycle diary (retrospective is unreliable)Does not impair core work / school functioning
Diagnosis: PMDD DSM-5 criteria
2. PMDD (Premenstrual Dysphoric Disorder) — severe, DSM-5 diagnosis:DSM-5 criteria (5+ symptoms, ≥ 1 from group A):
Group A (core mood, ≥ 1 required):
Marked mood lability / sudden sadness / tearfulnessMarked irritability / anger / interpersonal conflictMarked depressed mood / hopelessness / self-deprecationMarked anxiety / tension / on-edge feeling
Group B (other symptoms, total ≥ 5):
Decreased interestConcentration / thinking difficultyHypersomnia / fatigue / low energyMarked appetite change / overeating / food cravingsSleep disturbance (hypersomnia / insomnia)Feeling out of control / overwhelmedSomatic: breast tenderness / bloating / arthralgia / muscle pain / headache / edema
Key qualifiers:
Symptoms must cluster in the late luteal phase + resolve within 1-2 days after onset of menses (i.e., follow the hormone curve)Confirmed by 2-cycle prospective diary (DRSP scale standard)Causes clinically significant functional impairment (work / school / interpersonal)Not better explained by another disorder (e.g., premenstrual exacerbation (PME) of depression is not PMDD)
PMDD prevalence: 3-8% of reproductive-age women meet strict criteria (Halbreich 2003 review); a further 13-18% have premenstrual symptoms severe enough to impair them without meeting the thresholdOften misdiagnosed as "anxiety / bipolar" — the key differentiator is whether symptoms follow the cycle
Mechanism: ALLO + GABA-A + 5-HT
3. Mechanism (the atlas doesn't pretend we fully know, but there are core pathways)Hormone levels are not abnormal — PMDD patients have the same absolute E2/P levels as controls; what matters is brain sensitivity to normal hormone fluctuationAllopregnanolone (ALLO), a P metabolite, is a GABA-A receptor positive modulator (same site as alcohol / benzodiazepines)Luteal-phase ALLO ↑ → most women feel relaxed / aided sleepIn PMDD the same ALLO instead triggers anxiety + irritability — Bäckström 2014 calls this a paradoxical effect, and notes it tracks concentration on an inverted-U: very low and very high are fine, the middle band is where mood breaks, and the luteal phase passes straight through it5-HT system: greater luteal-phase serotonin drop + receptor density changes in PMDD → the chemical rationale for SSRI efficacyhypothalamic–pituitary–adrenal axis: The body's stress-response chain (hypothalamus → pituitary → adrenal) that releases cortisol. axis: blunted HPA response pre-menses → weak stress buffering
Treatment: SSRI + nutrition + red flags
4. SSRIs: Level A first-line for PMDD (Steiner 1995 NEJM, first RCT)Fluoxetine 20 mg/day — first FDA-approved PMDD drug (brand Sarafem)Sertraline 50-150 mg / paroxetine 20-30 mg also approvedRapid onset (unique to PMDD): unlike depression's 4-6 weeks, PMDD response within 1-2 cycles — suggesting direct neurotransmitter effect rather than neuroplasticityTwo dosing regimens:Continuous: daily — simple, stable side effectsLuteal-phase only: from ~ Day 14 post-ovulation to days 1-2 of menses → fewer side effects + lower cost, efficacy broadly similar to continuous (Marjoribanks 2013 Cochrane). Yonkers 2015 tested an even leaner schedule — dosing only from symptom onset — but its primary endpoint reached only P = .06, so do not shrink the window further on its strength
5. Other evidence-based interventions
CBT (cognitive behavioural therapy): worth trying, but know where the evidence stops — the Lustyk 2009 systematic review found a dearth of trials showing statistically significant CBT effects and called for methodologically rigorous work. Low-risk and stackable, not proven better than medicationExercise (moderate, 30 min × 3-5 sessions/week): for dysmenorrhea there is Cochrane-grade evidence (Armour 2019); for PMS mood and somatic symptoms the 2009 Daley review found a paucity of research and declined to make an evidence-based recommendation. Worth doing on low-risk-plus-other-benefits grounds, not because it is proven for PMSCa 1000-1200 mg/day (food + supplement) — in Thys-Jacobs 1998 (n=466) the calcium arm fell 48% from baseline but placebo fell 30% in the same trial; both halves together are the real effect sizeAdequate vitamin D (Bertone-Johnson 2005 NHS II): higher D intake → lower PMS risk (Level B)B6 50-100 mg/day (Wyatt 1999 BMJ Cochrane meta): overall PMS improvementReduce alcohol + caffeine + sodium (luteal phase): helps breast tenderness + irritability + edemaMg 200-400 mg/day: mild edema + mood improvement. ⚠️ The trial behind this (Quaranta 2007) is a pilot using a fixed 250 mg modified-release tablet — 200-400 is a practical range, not a tested oneVitex agnus-castus (chasteberry): some small RCTs positive (Level B), but product standardisation poor
6. Ineffective / weak
Progesterone supplementation (oral / vaginal / injection): the Cochrane review (Ford 2012) found only 2 eligible trials, and its verdict, verbatim, is that they did not show that progesterone is an effective treatment for PMS nor that it is not. So it is unsupported, not disproven — but the intuition that PMS comes from low P and should therefore be topped up still has no trial behind itEvening primrose oil: multiple RCTs negative"Heat-clearing" herbal mixtures (commercial TCM formulations): not standardised + may contain undeclared hormonal-activity compounds
7. Acute suicide risk
PMDD women have significantly elevated suicidal ideation + behaviour risk — in a nationally representative survey, PMDD vs women with no premenstrual symptoms: ideation OR 2.22 · plans OR 2.27 · attempts OR 2.10 (Pilver 2013)Suicide risk concentrates 1-3 days pre-mensesAny self-harm ideation → immediate psychiatry, not "it'll pass when the period comes"
Bottom line: PMS / PMDD is not a character flaw + not "loss of self-control" + not "period being too severe" — it is the nervous system's differential sensitivity to normal hormonal fluctuation. The rapid onset of SSRIs in PMDD is itself mechanistic evidence.
Chapter 5
Before / during / after · checklist
Before / during / after · checklist
This scene is the operational core of the atlas menstrual island — distilling the upstream mechanisms into an executable checklist for pre / during / post-period, ordered by evidence strength + time sensitivity.
🌙 7-10 days pre-period (luteal phase — dysmenorrhea prevention + PMS buffering)
Prophylactic NSAIDs (history of dysmenorrhea + moderate-to-severe pain) — start 1-2 days before the expected period, not after pain begins (PGs already released)Ibuprofen 400 mg q6h × 2-3 daysNaproxen 250-500 mg q8-12h × 2-3 daysWith food + don't exceed OTC ceilingMg 200-400 mg/day (citrate / glycinate) — smooth-muscle relaxation + NMDA modulation + migraine reduction (Peikert 1996 RCT); from luteal phase through cycle day 2B1 (thiamine) 100 mg/day — Gokhale 1996 large RCT: significant dysmenorrhea improvementB6 50-100 mg/day — Wyatt 1999 BMJ Cochrane: overall PMS improvement; do not chronically exceed 100 mg/day (peripheral neuropathy risk, see vitamin-b6 island)Omega-3 EPA + DHA 1-2 g/day — Rahbar 2012 RCT + Pattanittum 2016 Cochrane: dysmenorrhea + inflammatory PG modulation (atlas fats-omega-3 + fish-oil)Ginger (Zingiber officinale) 250 mg × 4/day — start 3 days pre-menses + first 3 days of period, Ozgoli 2009 RCT: equivalent to mefenamic acid + ibuprofenCa 1000-1200 mg/day (food-first) + adequate vitamin D — Bertone-Johnson 2005 NHS II: PMS risk significantly ↓Reduce sodium + alcohol + caffeine (luteal phase) — reduces edema + breast tenderness + irritabilityAdequate sleep + reduce blue-light exposure — sleep loss in the week before menses worsens PMSMaintain exercise — don't skip due to luteal fatigue; moderate aerobic 30 min improves mood + reduces bloating
🌙 7-10 days pre-period (luteal phase — dysmenorrhea prevention + PMS buffering)
Prophylactic NSAIDs (history of dysmenorrhea + moderate-to-severe pain) — start 1-2 days before the expected period, not after pain begins (PGs already released)Ibuprofen 400 mg q6h × 2-3 daysNaproxen 250-500 mg q8-12h × 2-3 daysWith food + don't exceed OTC ceilingMg 200-400 mg/day (citrate / glycinate) — smooth-muscle relaxation + NMDA modulation + migraine reduction (Peikert 1996 RCT); from luteal phase through cycle day 2B1 (thiamine) 100 mg/day — Gokhale 1996 large RCT: significant dysmenorrhea improvementB6 50-100 mg/day — Wyatt 1999 BMJ Cochrane: overall PMS improvement; do not chronically exceed 100 mg/day (peripheral neuropathy risk, see vitamin-b6 island)Omega-3 EPA + DHA 1-2 g/day — Rahbar 2012 RCT + Pattanittum 2016 Cochrane: dysmenorrhea + inflammatory PG modulation (atlas fats-omega-3 + fish-oil)Ginger (Zingiber officinale) 250 mg × 4/day — start 3 days pre-menses + first 3 days of period, Ozgoli 2009 RCT: equivalent to mefenamic acid + ibuprofenCa 1000-1200 mg/day (food-first) + adequate vitamin D — Bertone-Johnson 2005 NHS II: PMS risk significantly ↓Reduce sodium + alcohol + caffeine (luteal phase) — reduces edema + breast tenderness + irritabilityAdequate sleep + reduce blue-light exposure — sleep loss in the week before menses worsens PMSMaintain exercise — don't skip due to luteal fatigue; moderate aerobic 30 min improves mood + reduces bloating
Days 1-3: active management
🩸 Period days 1-3 (peak dysmenorrhea, active management)NSAID already started (1-2 days pre-menses) → continue on schedule — the single most important interventionHeat therapy (40-44 °C, 4-6 h, 1-2 times/day) — Akin 2001 RCT: equivalent to mefenamic acid; synergistic with NSAIDsHot water bottle / heat pad / heated trousers (worth it for recurrent users)Beware low-temperature burns (especially while sleeping)Adequate water + moderate exercise (low-to-moderate intensity) > complete bed restArmour 2019 Cochrane (Level B): moderate exercise 30 min × 4 weeks/week → significant dysmenorrhea reduction"No exercise during menses" is wrong — it should be "avoid maximal effort + stop if uncomfortable," not "no exercise at all"Walking / yoga / stretching / moderate aerobic all OKIron + vitamin C (HMB / anemic) — start 1-2 days after the period; 30-60 mg iron/day + 50-100 mg vitamin C concurrent (atlas iron + vitamin-c/iron L4)Alternate-day iron (Stoffel 2017) improves total absorption in mild-to-moderate deficiency (hepcidin reset)Gentle, easily-digestible diet — PGE2 increases gut motility, some women have menstrual diarrhea → reduce spicy + caffeine + ensure fiber"Be gentle with yourself" is not superstition — late luteal + first 2 days of menses have weakened cortisol regulation + heightened pain sensitivity; reducing high-stakes decisions + big arguments + extreme social load is reasonable
Post-period + supplement truth table
🌱 1-2 weeks post-period (follicular phase — repair + strength)Iron repair: HMB / deficient individuals supplement iron + vitamin C, but avoid taking with Ca / tea / coffee / dairy / antacids (at least 2 hours apart)Strength-training peak window — in Wikström-Frisén 2017, the group whose leg training was concentrated in the follicular phase gained significantly in squat, countermovement jump and hamstring peak torque over four months, while the luteal-concentrated group did not. Note it tested how you periodise, not which day you are stronger — and it is one small trialWant a strength PR / HIIT / heavy intensity? This is the windowAdequate protein 1.2-1.6 g/kg/day — for endometrial rebuilding + systemic repair (atlas protein/muscle)Diary review + adjust next cycle's strategy — record this cycle's peak pain / blood volume / red flags, decide whether next cycle's NSAID should start 24 or 48 hours earlierChronic-disease check / ferritin recheck — recurrent HMB → check ferritin + hemoglobin every 6 months; catch and treat early
Truth table for common "period supplements"
Brown-sugar water (widespread Chinese custom): mostly sugar + very little iron (~ 0.5 mg/100 g); essentially useless for iron repletion; subjective "warming" comes from the hot water itself. Not harmful but do not let it replace real iron sourcesDonkey-hide gelatin (e-jiao) / red dates (TCM "blood-tonics"): e-jiao has extremely low iron (~ 0.2 mg/g), protein is mostly collagen; red dates have ~ 2 mg iron/100 g, food-grade is fine but not a therapeutic dose"Period detox teas" / "period-regulating pills" / "brown-sugar ginger teas": no evidence; some products contain irregular ingredients (laxatives / herbal hormonal compounds)Chocolate / dark chocolate (≥ 70%): Mg + polyphenols + endorphin induction → subjective relaxation; some evidence support, but not a therapeutic tool"Womb-warming patches" (a Chinese consumer product): primarily iron-powder exothermic oxidation, physically equivalent to a hot water bottle (40-44 °C), not "TCM energy." The heat effect is genuinely effective, the name is misleading but the product isn't necessarily bad
Atlas connections
fats-omega-3 + fish-oil — PG pathway + EPA/DHA sources + form choicemagnesium + magnesium/relax L4 — uterine smooth-muscle relaxation + NMDA + migraine (Peikert 1996)vitamin-b6 — Wyatt 1999 PMS + upper-limit warningvitamin-b1 — Gokhale 1996 dysmenorrheavitamin-d + calcium — Bertone-Johnson 2005 PMSiron + vitamin-c/iron L4 — HMB → iron repletion + alternate-day + Stoffel 2017protein/muscle L4 — protein for post-menses repair + endometrial rebuilding
Period exercise: yes or no?
"Can I exercise during my period?" is one of the most misreported health questions. Let's answer with evidence, then provide an executable template.Core answer: yes, and for most women it is beneficial
Armour 2019 Cochrane meta: moderate exercise (30 min × 3-4 times/week) → significant reduction in dysmenorrhea severity + durationDaley 2009 review: on exercise for PMS specifically it found a paucity of research and declined to make an evidence-based recommendation — so the Cochrane line above covers dysmenorrhea, and this one does not extend it to PMSYonglitthipagon 2017 RCT: a yoga programme reduced menstrual pain in primary dysmenorrhea and improved physical fitness and quality of life. ⚠️ It did not measure PMS, so it is not evidence that yoga treats PMS
How to train? — stratified by intensity
OK during periods (most people)
Walking / jogging: 30-45 min at 50-70% max HRYoga / Pilates: emphasise stretching + breath, avoid extreme inversions (theoretically harmless but some women feel uncomfortable subjectively)Swimming: use a menstrual cup / tampon; does not contaminate pool water (water pressure prevents leakage)Dance / low-intensity HIIT intervals: as toleratedRegular strength training: pay attention to feel, may reduce load 5-10%
Adjust as tolerated
Heavy strength PRs / high-intensity HIIT: women with severe day-1-2 dysmenorrhea can delay to day 3Long-distance running (15+ km): depends on anemia + painCrossFit / extreme training: as tolerated
Not recommended short-term (severe dysmenorrhea)
If severe dysmenorrhea cannot be controlled with NSAIDs, don't tough it outDeep inversion postures (headstand, shoulderstand) feel uncomfortable for some women on days 1-2Excessive dehydration + hot environments (hot yoga + sauna): menses already lose water + narrowed thermoregulation, caution
Key principles
1. Listen to the body, not slogans — if tired, scale back; no need to insist on a "period PR"
2. Full warm-up + hygiene products ready — menstrual cups / tampons suit heavy activity better than pads
3. Hydration + electrolytes — period water loss + sweating, supplement Na/K as appropriate
4. Avoid very cold showers post-exercise — not superstition; peripheral vascular reactivity is slightly elevated during menses, no need to stress it
"Complete bed rest during your period" is a wrong tradition
Long sitting / bed rest → pelvic congestion ↑ → dysmenorrhea worseLight-to-moderate exercise = ↑ uterine blood flow + endorphin release → subjectively better than analgesics (in some women)Restriction should apply only to severe dysmenorrhea + red flags + heavy bleeding with anemia
Menses + high-level athletes (RED-S, low energy availability)
Female Athlete Triad → RED-S (Relative Energy Deficiency in Sport): low energy intake → functional hypothalamic amenorrhea (FHA) + ↓ bone density + stress fracturesSerious training + cycle disturbance / amenorrhea / very light periods → not "training is going well" but an energy-deficit warningManagement: more calories + lower training volume + nutrition counselling + gynaecology / endocrinology as needed
Bottom line: period exercise is individual, but the default should be keep moving rather than "lie down to recover"; intensity = listen to the body + plan equipment ahead + don't be tied to the slogan "periods need rest."
yonglitthipagon-2017-yoga-dysmenorrhea
Chapter 6
Myths debunked + escalate
Myths debunked + escalate
Most "period taboos" passed down on Chinese internet and from elders lack evidence, but like all folk wisdom a few of them really do hold. Let's put each one on the table.
🚫 No evidence (safely ignore)
"No hair-washing during periods" — no study supports this; modern bathrooms with warm water + a hairdryer have no causal link to "headache" or "head-wind." The taboo arose in an era without water heaters or hairdryers, where "avoid getting chilled" was reasonable, but it doesn't apply now"No cold water / cold food during periods" — "the uterus catches cold" is not a medical concept; the uterus does not directly contact GI contents; cold food is warmed to body temperature before reaching the intestine; no direct causal link to dysmenorrhea. Small observational studies fail to confirm cold food/dysmenorrhea association (although warm water beats cold water subjectively + increases hydration, a real benefit, but not from the taboo)"No swimming during periods" — use menstrual cup / tampon to prevent leakage; water pressure prevents outflow; chlorine disinfection + showering afterwards eliminates hygiene concerns"No sex during periods" — medically not forbidden, comfort + personal choice; contraception still needed (menstrual conception is rare but possible) + STI protection (cervical os slightly open, theoretical infection-risk slightly elevated, practical difference minimal)"No dental work / surgery during periods" — emergencies proceed; elective major surgery routinely avoids menses, but the rationale is "reduce bleeding interference + patient comfort," not "harms vital energy""Periods detoxify / menstrual blood is dirty" — menstrual fluid = endometrial tissue + blood + mucus, no "toxins""Red dates / e-jiao / brown sugar replenish blood" — see the truth table; cultural symbols, not therapeutic iron doses"Eating fruit / vegetables / cold dishes = cold" — no evidence"No photos + no ancestor worship + no temples during periods" — cultural / taboo topics, unrelated to physiology
🚫 No evidence (safely ignore)
"No hair-washing during periods" — no study supports this; modern bathrooms with warm water + a hairdryer have no causal link to "headache" or "head-wind." The taboo arose in an era without water heaters or hairdryers, where "avoid getting chilled" was reasonable, but it doesn't apply now"No cold water / cold food during periods" — "the uterus catches cold" is not a medical concept; the uterus does not directly contact GI contents; cold food is warmed to body temperature before reaching the intestine; no direct causal link to dysmenorrhea. Small observational studies fail to confirm cold food/dysmenorrhea association (although warm water beats cold water subjectively + increases hydration, a real benefit, but not from the taboo)"No swimming during periods" — use menstrual cup / tampon to prevent leakage; water pressure prevents outflow; chlorine disinfection + showering afterwards eliminates hygiene concerns"No sex during periods" — medically not forbidden, comfort + personal choice; contraception still needed (menstrual conception is rare but possible) + STI protection (cervical os slightly open, theoretical infection-risk slightly elevated, practical difference minimal)"No dental work / surgery during periods" — emergencies proceed; elective major surgery routinely avoids menses, but the rationale is "reduce bleeding interference + patient comfort," not "harms vital energy""Periods detoxify / menstrual blood is dirty" — menstrual fluid = endometrial tissue + blood + mucus, no "toxins""Red dates / e-jiao / brown sugar replenish blood" — see the truth table; cultural symbols, not therapeutic iron doses"Eating fruit / vegetables / cold dishes = cold" — no evidence"No photos + no ancestor worship + no temples during periods" — cultural / taboo topics, unrelated to physiology
Partly true + genuinely true
🤔 Partially true (the mechanism is not as in legend)"Keep warm during periods" — partly true: abdominal + lumbar warmth (40-44 °C × 4-6 h) is effective non-pharmacologic analgesia (Akin 2001 RCT); but you don't need to "avoid all cold," just targeted heat + appropriate ambient warmth"No intense exercise during periods" — see the prior scene: partly true, but it's "as tolerated," not "no exercise""Lower immunity during periods" — partly true: subtle luteal-phase immune modulation (slight T-helper 2 shift) + HSV / some infections more likely to recur the week before, but not "severely immunocompromised"; no special isolation needed"Heightened emotional sensitivity during periods" — see PMS/PMDD above; real neuroscience, not "melodrama"
✅ Genuinely true
Adequate sleep + reduce caffeine + alcohol (the week before) — sleep loss premenstrually worsens both PMS + dysmenorrhea (data + mechanism both support)Adequate water + warm drinks — not "avoid cold" but compensating for fluid loss + subjective comfortNSAID + heat combination + start 1-2 days early — the evidence-based gold combination for pain controlHMB → early ferritin + iron supplementation — not "heavy periods are normal" but the most common reversible cause of iron-deficiency anemia
Escalation: when to see a doctor / ER
⬆️ When to escalate to medical care?Period management can be 70-80% covered by NSAIDs + heat + lifestyle, but several clear escalation triggers apply:
Escalate to OTC + nutritional intervention (no clinic needed)
Moderate dysmenorrhea + 1-2 day work impactRegular cycle + normal volume + no red flags
Escalate to gynaecology outpatient (this month)
NSAIDs ineffective / contraindicated → gynaecology assessment of COC / LNG-IUDHMB (PBAC > 100 or subjective "1 hr saturation") → gynaecology + iron statusPersistent dysmenorrhea ≥ 6 months + progressively worsening → endometriosis work-upPersistent cycle abnormality (< 21 or > 35 days for ≥ 3 cycles) → endocrinology + gynaecologyPeriods + easy bruising / nosebleeds → coagulopathy screen (vWD)PMS severely impacting work / suicidal ideation → joint psychiatry + gynaecology evaluation for PMDD
Escalate to ER (today)
Heavy bleeding + dizziness / tachycardia / pallorSevere abdominal pain + positive pregnancy test (ectopic risk)Any postmenopausal vaginal bleedingHigh fever + abnormal discharge (PID)
Medical treatment tools (under gynaecology guidance)
COC: suppresses ovulation + thins endometrium → dysmenorrhea ↓ 70-90% + HMB ↓; simultaneously contraceptiveRisk: VTE (especially smokers + 35+ + aura migraine)Suited to: dysmenorrhea + needing contraception + endometriosis + PCOSLNG-IUD (Mirena / Kyleena etc.): local progestin release → thins endometrium → HMB ↓ 70-95% + dysmenorrhea ↓ + 5-year contraceptionSuited to: HMB + dysmenorrhea + endometriosis + adenomyosis; first-choice for manyProgestin only: situationalGnRH antagonists (elagolix / relugolix): moderate-severe endometriosis / fibroids, short-term estrogen suppression + add-back to protect boneTranexamic acid: HMB acute relief (taken in the first 5 days of menses) → menstrual blood loss ↓ 30-50%; does not affect the cycleSurgery: only for the most severe endometriosis / large fibroid / adenomyosis / refractory HMB; hysterectomy is terminal
Tools, privacy + for everyone
Period-tracking tools (privacy first)Apps: Clue / Flo / Apple Health (prefer local storage) / Garmin Health syncPrivacy warning: post-Roe v. Wade some US states have seen "menstrual data subpoenaed by courts" → prefer apps with local storage + end-to-end encryption + non-US serversRequired, long-term usable: cycle start date / length / volume / pain / abnormal bleeding / PMS scoreA 3-6 month log = more informative than any single hormone draw, and the strongest leverage at the gynaecology visit
For non-women readers
Menstruation is not "a women's matter" — it is everyone's health literacyPartners / fathers / friends / colleagues understanding the basics + recognising red flags = sparing her from carrying information asymmetry alone"Just endure it" + "normal period pain" are the two phrases this generation of women has heard the most — the atlas hopes to make those phrases occur a few fewer times
Bottom line: periods are not a taboo subject, they are a health topic that is quantifiable, optimisable, escalable. "Endure" is history's cost; understanding + tools + early checking is now's option.
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