Hashimoto's Thyroiditis

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Selenium
The Toulis 2010 meta-analysis pooled 4 randomized trials (most patients were already on levothyroxine): after 3 months of selenium, anti-thyroid peroxidase (TPO) antibody titers were lower; effects on thyroid function, dose needs and thyroid structure were either not seen or not reported. Selenium has a U-shaped dose response and too much is harmful, so do not megadose.

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Iodine
The thyroid needs iodine to make hormone, but people with Hashimoto's thyroiditis are more sensitive to iodine than others: long-term excess iodine is linked with worsening thyroid autoimmunity, while too little means too little hormone. The aim is enough without excess, not as much as possible; do not eat large amounts of high-iodine foods such as kelp every day.
Endocrine
Hashimoto's thyroiditis is an autoimmune disease in which the immune system attacks the thyroid, and one of the most common causes of an underactive thyroid; it plays out along the hormone axis of hypothalamus, pituitary and thyroid. Seen along that axis, it becomes clear why thyroid-stimulating hormone (TSH) is the test to watch, and why levothyroxine is taken on an empty stomach and kept apart from acid-suppressing drugs and iron supplements.
Depression & Anxiety
An underactive thyroid brings tiredness, loss of interest, weight gain and slowed thinking, which look much like depression. So checking thyroid-stimulating hormone (TSH) before treating depression is routine practice; depression is also more common in people with Hashimoto's thyroiditis than in others (an observed association).
Cold hands and feet
With an underactive thyroid, feeling the cold more than usual is one of the common symptoms, often alongside extreme tiredness, constipation and weight gain. For someone who has only recently started to feel unusually cold, a thyroid blood test is a cheap step.
Hair Loss
Thyroid hormone influences the hair growth cycle. With an underactive thyroid (hypothyroidism), hair often thins all over and turns dry and brittle, usually alongside fatigue and feeling cold. This kind of hair loss shows up on a blood test and usually recovers with treatment, so it is worth ruling out early.
Chronic Fatigue
An underactive thyroid is a routine item in a fatigue work-up: once found, it is corrected with levothyroxine, which makes it a reversible cause rather than something to be written off as chronic fatigue.

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What is Hashimoto's

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Hashimoto's thyroiditis (Hashimoto's for short) is the immune system mistaking its own thyroid — the gland at the front of the neck that sets how fast the whole body runs — for an enemy, and attacking it.

The immune cells go after two of the thyroid's own tools: the enzyme that attaches iodine to the hormone (thyroid peroxidase, ), and a large protein that serves as the warehouse for half-built hormone (thyroglobulin, Tg). The body starts making anti-TPO and anti-Tg antibodies, T cells move into the gland and keep it inflamed for years, and thyroid cells are destroyed a little at a time.

Output falls, and the gland can no longer make enough thyroid hormone (or , the active form that tissues make from it). As soon as the pituitary senses too little hormone, it turns up its "work harder" signal (thyroid-stimulating hormone). Thyroid hormone is the throttle for every cell in the body; with the throttle turned down, the whole person slows: feeling cold, feeling sleepy, gaining weight quietly, thinking through fog.

So Hashimoto's is the cause (an immune attack) and hypothyroidism is the result (not enough hormone); the two are not the same thing. Rarely, someone whose hypothyroidism is severe and has gone untreated for a long time develops a very slow heart rate, a very low body temperature and clouded consciousness. That is myxedema coma, and it needs emergency care immediately.

Educational content, not medical advice — consult a clinician.

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