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Stroke · the one thing most likely to happen to you
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In one pass The brain is only about 2% of body weight, yet it uses about a fifth of the body's oxygen and energy (Raichle 2002).
Educational content, not medical advice — consult a clinician.
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Chapter 1
How badly the brain takes ischemia
The brain is only about 2% of body weight, yet it uses about a fifth of the body's oxygen and energy (Raichle 2002). It stores almost no fuel, so when blood stops, it starts to die within minutes.
The brain does have a little backup. Small detour channels between arteries, called collaterals, can squeeze some blood in from the side when the main road is blocked. As blood flow falls, it crosses two thresholds in turn. Below the first, neurons stop firing, and one side of the body stops obeying. Below the second, cell membranes can no longer hold, and only then do cells truly die (Astrup 1981). In people whose collaterals can carry enough blood around the block, the tissue sits between the two thresholds: still alive, just shut down, and it can be saved once blood flows again. Where the collaterals cannot, the tissue falls straight through.
So if one side of the face suddenly droops, an arm cannot be lifted, or speech is slurred, call emergency services now (120 in China) even if it clears up within minutes. Do not wait.
The brain does have a little backup. Small detour channels between arteries, called collaterals, can squeeze some blood in from the side when the main road is blocked. As blood flow falls, it crosses two thresholds in turn. Below the first, neurons stop firing, and one side of the body stops obeying. Below the second, cell membranes can no longer hold, and only then do cells truly die (Astrup 1981). In people whose collaterals can carry enough blood around the block, the tissue sits between the two thresholds: still alive, just shut down, and it can be saved once blood flows again. Where the collaterals cannot, the tissue falls straight through.
So if one side of the face suddenly droops, an arm cannot be lifted, or speech is slurred, call emergency services now (120 in China) even if it clears up within minutes. Do not wait.
Numbers · What each minute of delay costs
The two thresholds are how Astrup 1981 defined the ischemic penumbra: the ring of tissue caught between electrical failure (neurons stop firing) and membrane failure (the pumps give out and cell structure starts to break down). That tissue has already stopped working, which is why one side of the body stops obeying; but its structure is still there, and if blood flows back in time, the ring can still be saved.Why time is so expensive has been worked out as a model, not by counting neurons in patients' brains. Saver 2006 used known neuron density and how fast a typical large-vessel ischemic infarct grows, and estimated that a typical untreated large-vessel ischemic stroke destroys about 1.9 million neurons every minute, along with about 14 billion synapses and 12 km of nerve fibers. Converted, the ischemic brain ages about 3.6 years for every hour. This is a model estimate, not a number measured in a clinical trial.
So behind the phrase time is brain there is an estimate: every minute of hesitation takes a piece out of your later years of speaking, walking and recognizing people. The better the collaterals, the larger the ring between the two thresholds, and the more that can still be won back.
Numbers · How common stroke is in China
Stroke is the leading cause of death in China, with more than 2 million new cases a year, and it costs more years of healthy life than any other disease (Wu 2019).The lifetime risk is starker. The Global Burden of Disease study calculated, across 195 countries, the probability that an adult over 25 will have a stroke in their lifetime: about 24.9% on average worldwide, while China's is 39.3%, the highest in the world (41.1% in men, 36.7% in women) (GBD 2018).
A national door-to-door survey of 480,000 adults also gives the breakdown (Wang 2017):
Of new strokes, 69.6% are ischemic23.8% are intracerebral hemorrhage4.4% are subarachnoid hemorrhageAmong stroke survivors, 88% had high blood pressure, 48% smoked and 44% drank alcohol
Hold on to that 23.8% for hemorrhage. Roughly one stroke in four is a bleed, and that is why no one at the scene should give aspirin on their own.
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Chapter 2
Clot and bleed are opposite diseases
The word stroke hides two diseases that run in opposite directions. In an ischemic stroke a clot blocks an artery and cuts off blood downstream, so treatment has to open the block. In a hemorrhagic stroke an artery breaks and blood leaks into brain tissue, so treatment has to stop the bleeding. The drug that saves someone with an ischemic stroke is fuel on the fire for someone with a bleed.
The trouble is that the two can look exactly the same. A face suddenly drooping on one side, an arm that cannot be lifted, slurred speech: from these alone, nobody at home can tell a block from a bleed. Only a head CT scan can, and it takes minutes.
So the emergency order is fixed: imaging first, drugs second. Only once CT has ruled out bleeding do doctors move toward clot-dissolving and antiplatelet drugs (AHA/ASA 2026). That step cannot be skipped in the living room, and it is why the aspirin people take for a heart attack does not carry over to stroke.
The trouble is that the two can look exactly the same. A face suddenly drooping on one side, an arm that cannot be lifted, slurred speech: from these alone, nobody at home can tell a block from a bleed. Only a head CT scan can, and it takes minutes.
So the emergency order is fixed: imaging first, drugs second. Only once CT has ruled out bleeding do doctors move toward clot-dissolving and antiplatelet drugs (AHA/ASA 2026). That step cannot be skipped in the living room, and it is why the aspirin people take for a heart attack does not carry over to stroke.
Safety · Why not take an aspirin first
The line older relatives love to pass around, take an aspirin first, makes sense for a heart attack, but carried over to stroke it becomes dangerous. Aspirin makes platelets less likely to clump. If this is a hemorrhagic stroke, that is exactly the direction you do not want: on a vessel that is actively leaking, you have slowed down the step that stops the bleeding (AHA/ASA 2022 guideline on intracerebral hemorrhage).China's numbers raise the stakes. The 23.8% in the national survey means that roughly one stroke in four is a bleed. Gambling on an aspirin in the living room is not a one-in-ten-thousand bet; it is one in four.
So do not give medication at the scene. Imaging first, drugs second: only once CT has ruled out bleeding will doctors move toward clot-dissolving and antiplatelet drugs (AHA/ASA 2026). With the order right, the same drug turns from a danger into a tool a doctor can use.
Red flag · What to do and not do at the scene
If you suspect a stroke, what not to do:Do not give any medication: aspirin, blood-pressure pills, heart pills, the herbal remedy in the cabinet, none of them. You cannot tell a block from a bleed, so any of them could be the wrong one.Do not give water or food. Stroke often knocks out swallowing as well, so anything you give can go into the lungs. Hospitals themselves run a swallowing screen first and only allow eating and drinking by mouth once it is passed (AHA/ASA 2026).Do not give blood-pressure medication just because the reading is high. Blood pressure in the acute phase has its own rules; leave it to the doctors.Do not pinch pressure points, draw blood from the fingertips, shake the person or slap them.
What to do:
Call emergency services immediately (120 in China).Note the time the person was last seen normal: that single fact decides which treatments doctors can give.Lay them on their side with the head slightly raised, and loosen the collar.Find the medications they usually take and bring them along.
Why an ambulance rather than your own car: the ambulance can alert the hospital on the way, so the CT scanner and the clot-dissolving team are standing by and the patient goes straight into the pathway. Driving there yourself means starting over in the queue at the emergency triage desk.
Chapter 3
Three roads into ischemic stroke
The same blocked artery in the brain can have completely different stories upstream. In one, a plaque inside the wall of a large artery ruptures and platelets form a clot on the spot. In another, a clot shaken loose inside the heart rides up the carotid artery into the brain. In the third, years of high blood pressure slowly narrow the hair-thin perforating arteries deep in the brain until they close.
One symptom, three entirely different upstream causes, and the key for prevention differs too. The large-artery road calls for driving down the lipoprotein particles that burrow into the artery wall; a clot from the heart calls for anticoagulation; small vessels call for lower blood pressure. The wrong key opens no door, which is also why doctors want the cause pinned down quickly.
One symptom, three entirely different upstream causes, and the key for prevention differs too. The large-artery road calls for driving down the lipoprotein particles that burrow into the artery wall; a clot from the heart calls for anticoagulation; small vessels call for lower blood pressure. The wrong key opens no door, which is also why doctors want the cause pinned down quickly.
Mechanism · Where each of the three roads begins
Road one · large-artery atherosclerosis. Over years, a plaque builds up in the wall of the carotid artery or a large artery inside the skull. One day the fibrous cap on its surface tears, and platelets pile on at once to form a clot. Either it blocks that artery on the spot, or fragments wash downstream and plug a finer branch (Libby 2011). The real upstream cause on this road is -containing lipoprotein particles (the kind read alongside on a lab report) burrowing into the artery wall; for how particle counts work, see the story on blood lipids (see Dyslipidemia).Road two · cardioembolism. In atrial fibrillation, the left atrium stops contracting in rhythm and quivers instead. Blood lingers in a dead-end pouch called the left atrial appendage and slowly clots, and one day a clot is washed out and rides the carotid artery straight up to the brain. In non-rheumatic atrial fibrillation, about nine in ten left-atrial clots sit in that appendage (Blackshear 1996). These clots tend to be large and block large vessels, which is why cardioembolic strokes are usually more severe. As for how atrial fibrillation is fed in the first place, sleep apnea is one route (see Obstructive Sleep Apnea).
Road three · small-vessel disease. Years of high blood pressure slowly remodel the perforating arteries deep in the brain (only 40 to 200 microns across): the walls thicken and undergo hyaline change and lipohyalinosis, the channel narrows and finally closes, leaving a tiny lacunar infarct (Wardlaw 2013). The insidious part is that each small infarct may cause no symptoms at all, but piled up they turn into unsteady walking, slower reactions and declining thinking. For how blood pressure remodels vessels like this, see the story on high blood pressure (see Hypertension).
Clinical · Pinning down the cause within 48 hours
Clinically, ischemic stroke is classified by cause, and the scheme in use for more than thirty years is called TOAST (Adams 1993). Its trunk is the same three roads: large-artery atherosclerosis, cardioembolism and small-vessel disease.One symptom, three entirely different upstream causes: that is why doctors must pin down the cause. The 2021 secondary-prevention guideline of the American Heart Association and American Stroke Association (AHA/ASA) even sets a clock. After a first stroke or a transient ischemic attack (TIA, where the symptoms clear by themselves within minutes to an hour), the work-up for the cause should start within 48 hours (Kleindorfer 2021). A different cause of the block means completely different prevention: large-artery atherosclerosis needs driven down, cardioembolism needs anticoagulation, and small-vessel disease needs lower blood pressure.
Chapter 4
Why treatment has a time window
At the moment an artery is blocked, the brain tissue downstream does not all die at once. The central patch, farthest from the collaterals, really does die within minutes; this is the infarct core. The ring around it lives on the little collateral blood squeezed in from the side and sits at an awkward middle value: not enough for neurons to work, but still enough to keep them alive.
That ring is the ischemic penumbra: caught between the loss of electrical firing and the failure of cell membranes, still alive but shut down (Astrup 1981). Once blood flows back, these cells can go back to work. Clot-dissolving drugs and clot removal are never racing for the core, which is already gone; they are racing for this ring.
The time window is not an administrative rule. It is how long this ring can hold out, and today's imaging can look directly at how much of that tissue a person has left.
That ring is the ischemic penumbra: caught between the loss of electrical firing and the failure of cell membranes, still alive but shut down (Astrup 1981). Once blood flows back, these cells can go back to work. Clot-dissolving drugs and clot removal are never racing for the core, which is already gone; they are racing for this ring.
The time window is not an administrative rule. It is how long this ring can hold out, and today's imaging can look directly at how much of that tissue a person has left.
Clinical · Why the treatment window keeps widening
The physiology of the penumbra grew directly into today's treatment windows:Intravenous thrombolysis (a drug given into a vein to dissolve the clot): the standard window is within 4.5 hours of onset (Hacke 2008, the ECASS III trial). The earlier NINDS trial set 3 hours in 1995 (NINDS 1995), and ECASS III later pushed it to 4.5 hours.Endovascular thrombectomy (a catheter that pulls the clot straight out of the artery): for a blocked large vessel, the window stretches to 6 to 24 hours after onset. The DAWN trial (Nogueira 2018) went out to 24 hours; the DEFUSE 3 trial (Albers 2018) covered a shorter part of that range.
Why that last window stretches so far is worth seeing clearly. DAWN and DEFUSE 3 chose patients not by the clock but by imaging, using perfusion scans to see how much penumbra a person had left. Someone with a large penumbra and a small core still benefits from reopening even after 20 hours; someone whose penumbra burned out long ago gains nothing even at 3 hours.
So the real rule is not how many hours but how much salvageable brain you have left. On average, that amount shrinks with every minute: measured across 58,000 real cases, the earlier thrombolysis started, the better the outcome, and the association was continuous (Saver 2013).
The window is still widening. In the 2026 AHA/ASA guideline on acute ischemic stroke, some patients selected by imaging can receive intravenous thrombolysis 4.5 to 9 hours after onset, and thrombectomy for a blocked basilar artery is allowed out to 24 hours (AHA/ASA 2026). The direction is consistent: judge the patient by imaging, not only by the clock.
But this is not permission to wait. Every window above is a ceiling, not a target. The sooner the artery is reopened, the more is saved, and whether someone qualifies for these windows at all depends on whether the time of onset can be stated. That is why the instruction at the scene, note the time the person was last seen normal, matters so much.
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Chapter 5
Recognize · call now
Stroke symptoms almost always share two features: they are sudden, and they are on one side. One side of the face droops, one arm cannot be lifted, speech is slurred, and it does not come on gradually; it happens all at once.
The mnemonic taught internationally is FAST; the one promoted in China specifically for recognizing stroke is called Stroke 1-2-0. Both check the same three things: one face, two arms, one spoken sentence. If any one of them is wrong, call emergency services now (120 in China). Do not drive the person yourself, do not wait for family to get home from work, and do not give any medication first.
If the symptoms disappear on their own after a few minutes, go to the emergency department all the same: that is often the warning before a bigger stroke.
This story is education to help you understand why; it cannot replace a doctor. If any of the signs above appears, seek medical care immediately.
The mnemonic taught internationally is FAST; the one promoted in China specifically for recognizing stroke is called Stroke 1-2-0. Both check the same three things: one face, two arms, one spoken sentence. If any one of them is wrong, call emergency services now (120 in China). Do not drive the person yourself, do not wait for family to get home from work, and do not give any medication first.
If the symptoms disappear on their own after a few minutes, go to the emergency department all the same: that is often the warning before a bigger stroke.
This story is education to help you understand why; it cannot replace a doctor. If any of the signs above appears, seek medical care immediately.
Red flag · How to recognize a stroke
The mnemonic taught internationally is FAST:F (face): ask the person to smile. Is one corner of the mouth drooping?A (arm): ask them to hold both arms out level. Does one drift down?S (speech): ask them to say a sentence. Is it slurred or impossible, or can they not understand you?T (time): if any of these is present, note the time and call an ambulance immediately.
The Chinese-speaking world has a version that is even easier to remember, made specifically for recognizing stroke, called Stroke 1-2-0 (Zhao 2017):
1, look at one face: is it uneven, is the mouth pulled to one side?2, check two arms: held out level, is one side weak?0, listen to the speech: is it unclear?
If any one of the three appears, dial 120 immediately. The clever part of the design is that it makes the mnemonic and the number you have to dial one and the same.
Call emergency services right now (120 in China) if any of these appears (do not drive the person yourself, do not wait for family to get home from work, do not give any medication first):
Sudden numbness or weakness of the face, arm or leg on one sideSudden trouble speaking, or trouble understanding what others saySudden trouble seeing in one or both eyesSudden dizziness, unsteady walking or loss of balanceA sudden headache that is the worst of their life (possibly a subarachnoid hemorrhage)
This story is education to help you understand why; it cannot replace a doctor. If any of the signs above appears, seek medical care immediately.
Red flag · Why vanished symptoms still mean the ER
The most expensive decision at the scene of a stroke is let's wait and see whether it gets better on its own.Why it is so expensive has already been worked out in Why treatment has a time window: every minute you wait, the ring of brain that could be saved shrinks.
And wait and see often seems to win, because stroke symptoms really do sometimes ease on their own. That brings us to the most dangerous situation of all.
Transient ischemic attack (TIA): symptoms identical to a stroke that disappear on their own within minutes to an hour. Many people breathe a sigh of relief, decide it was nothing and skip the hospital.
That is exactly backwards. A TIA is not a false alarm. It is the strongest warning you will ever get: an artery in the brain has already been blocked once, and this time the clot happened to break up by itself. Next time it may not. And the most dangerous window after a TIA is precisely the first few days.
The good news is that this warning can be acted on. The EXPRESS study in Oxford, UK, did something very plain: it moved patients with a TIA or minor stroke from waiting their turn for a clinic appointment to assessment the same day and secondary-prevention drugs started the same day. Compared with patients in the same area before the change, the risk of an early repeat stroke fell by about 80% (Rothwell 2007). This was a before-and-after comparison, not a randomized trial, but the effect was large and its direction clear. The same drugs; only the median time to the first prescription fell from 20 days to 1 day.
So hold on to this line: if the symptoms went away, that is all the more reason to go to hospital now, and to the emergency department, not next week's clinic.
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Chapter 6
Most of the risk can be changed
Plaque, a clot in the heart's upper chamber, perforating arteries narrowed by years of high pressure: none of these grows in minutes. The real battlefield of stroke is the decades before it happens.
The good news is that in a large case-control study across 32 countries (O'Donnell 2016), ten modifiable factors together statistically accounted for about nine-tenths of stroke risk, with high blood pressure at the top worldwide. This is an estimate from an observational study, but it shows that most of the risk of stroke lies in things that can be changed; it is not fate.
China's own two large trials each pin down one end: an antiplatelet drug a doctor starts on the day of the stroke, and a bag of salt swapped in the kitchen.
The good news is that in a large case-control study across 32 countries (O'Donnell 2016), ten modifiable factors together statistically accounted for about nine-tenths of stroke risk, with high blood pressure at the top worldwide. This is an estimate from an observational study, but it shows that most of the risk of stroke lies in things that can be changed; it is not fate.
China's own two large trials each pin down one end: an antiplatelet drug a doctor starts on the day of the stroke, and a bag of salt swapped in the kitchen.
Evidence · Nine-tenths of risk, two China trials
INTERSTROKE ran a case-control study in 32 countries and concluded that 10 modifiable factors together account for about 90.7% of stroke risk worldwide (91.5% for ischemic stroke, 87.1% for intracerebral hemorrhage) (O'Donnell 2016). That percentage is the population attributable risk (PAR): if these associations are all causal, it is how many strokes would in theory disappear if every one of these factors were removed. It comes from an observational study and is an estimate, not an effect measured in a trial.The ten are: high blood pressure (global PAR 47.9%, the largest single factor), physical inactivity, blood lipids, diet, waist-to-hip ratio, psychosocial factors, smoking, cardiac causes (atrial fibrillation and others), alcohol and diabetes.
In other words, most of the risk of stroke is written in things you can change.
China's own two large trials each pin down one end.
CHANCE (Wang 2013): 5170 Chinese patients were randomized within 24 hours of a minor stroke or a high-risk transient ischemic attack (TIA) to one of two groups: clopidogrel plus aspirin for 21 days followed by a single drug, or aspirin alone throughout. Stroke recurrence within 90 days fell by about 32% in relative terms, with no increase in bleeding. This result from China was later written into guidelines around the world.
Note that it does not contradict do not give aspirin yourself from Clot and bleed are opposite diseases: the difference is after a CT scan, with ischemic stroke confirmed, prescribed by a doctor. With the order right, the same drug turns from a danger into a lifesaver.
SSaSS (Neal 2021): more than twenty thousand rural Chinese residents (most with a previous stroke, the rest aged 60 or over with high blood pressure) were randomized village by village, in an open-label design, to swap their household cooking salt for a low-sodium salt of 75% sodium chloride and 25% potassium chloride. Over about 5 years, stroke fell by 14%, cardiovascular events by 13% and death from any cause by 12%, all relative reductions. From swapping one bag of salt. (Not for people with chronic kidney disease or taking potassium-sparing drugs, because of the risk of high blood potassium; details in the story on high blood pressure (see Hypertension).)
Clinical · The four parts of secondary prevention
The 2021 secondary-prevention guideline of the American Heart Association and American Stroke Association (AHA/ASA) (Kleindorfer 2021) comes down, roughly, to four things:1. Find the cause first. Start the work-up within 48 hours of a first stroke or transient ischemic attack (TIA). Large-artery, cardioembolic or small-vessel: the drugs that follow are completely different.
2. Blood pressure. It is the largest single factor by global PAR (47.9%). But INTERSTROKE states plainly that the ranking differs by region: in China, the highest PAR actually belongs to physical inactivity. So do not map the global ranking straight onto yourself. The robust finding is that the ten factors together account for about nine-tenths, not that any one of them always comes first. The mechanism, the DASH diet and low-sodium salt are all in the story on high blood pressure (see Hypertension).
3. Blood lipids. After an ischemic stroke, the -containing particles (the kind read alongside on a lab report) need to come down. In a of statin randomized trials covering 170,000 people, every 1 mmol/L drop in LDL cut major vascular events by about a fifth in relative terms (CTT 2010). The particle arithmetic is in the story on blood lipids (see Dyslipidemia).
4. Clot prevention. Here is a fork you must not blur: ischemic stroke from large-artery or small-vessel disease takes an antiplatelet drug, while cardioembolism caused by atrial fibrillation needs an anticoagulant, not aspirin. The two are not interchangeable.
Add to that quitting smoking, moving more and controlling blood glucose (see Type 2 Diabetes & Prediabetes), plus checking for sleep apnea: it feeds high blood pressure and atrial fibrillation at the same time, which means it feeds two of the three roads at once (see Obstructive Sleep Apnea).
On whether people who have never had a stroke should routinely take aspirin for primary prevention: the answer has changed in recent years and is no longer everyone should. Talk it over with a doctor rather than deciding on your own.
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Myth · Claims about stroke that spread widely
A seasonal IV drip to clear the blood vessels? A blood vessel is not a water pipe, and the plaque in it is not limescale; it cannot be flushed out. Plaque grows inside the vessel wall, not floating in the channel (Libby 2011), so flushing the channel cannot reach it, anatomically speaking. Mainstream Stroke guidelines list many measures, and periodic drips are not among them (Kleindorfer 2021). And the ginkgo preparations often used in those drips produced no convincing evidence in the Cochrane systematic review on acute ischemic stroke (10 trials, 792 people) (Zeng 2005). What you pay is money, time and an unnecessary needle in a vein.Pricking the fingertips to let blood at the first sign of stroke saves lives? This one spreads hardest on WeChat and is the most dangerous. Nothing supports it, and its real harm is delay: by the arithmetic of Saver's 2006 model, the 20 minutes you spend pricking fingers at home is about 38 million neurons (Saver 2006). This is not no harm in trying; trying costs brain.
Nattokinase, ginkgo or fish oil dissolve clots? It is worth being precise here, because the truth is not simply they all get digested. The evidence for nattokinase only reaches : the 2023 (6 randomized trials, 546 people) looked at blood pressure, blood lipids and clotting measures, and not one endpoint was stroke or a cardiovascular event (Li 2023). In other words, it has never been shown to dissolve a real clot stuck in your brain, let alone replace clot-dissolving treatment. Supplements work on a scale of months and years; stroke works on a scale of minutes. The two are not even in the same order of magnitude.
The symptoms vanished in a few minutes, so it is nothing? That is a transient ischemic attack (TIA), the strongest warning you will ever get, not nothing (Rothwell 2007).
Young people do not have strokes? They do. The burden of stroke deaths among people aged 15 to 49 in China has never gone away, and among young men the death burden from ischemic stroke and subarachnoid hemorrhage is still rising (Wang 2024). Youth is not a talisman: high blood pressure, smoking and atrial fibrillation do their work at any age.
One last honest point: a person in China has a lifetime probability of stroke of about 39.3%, the highest in the world (GBD 2018). The number sounds frightening, but read it alongside INTERSTROKE's nine-tenths and the conclusion is actually hopeful: the country with the highest risk is also the country with the most room to change it. Blood pressure, tobacco, atrial fibrillation and salt go a long way toward deciding how much of that 39.3% lands on you.
And if it does happen, there is only one thing to do, already written above: look at one face, check two arms, listen to the speech, and call 120 (your local emergency number) now.
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