“Does Hashimoto's disease cause hair loss?”

Abnormal thyroid levels can cause her loss. Hashimoto's autoimmune disease share the same root cause as autoimmune alopecia.

Yes it can. Hashimoto's disease is an auto-immune problem that comes through your genes. It can result in a hypothyroid state in which your organs do not function well. This can effect your hair follicules that may die and produce no new hair. Hair loss and/or graying may be the result. Be aware though that there are other causes of hair loss so see your physician or a Dermatologist to determine the cause of the hair loss.

Hashimotos thyroiditis is an autoimmune disease that damages the thyroid gland. It usually startes after the age of 5 years. It is more common in the older population. In children, the incidence rate of Hashimotos thyroiditis is about 1.5% per year while in adults it is about 3.5%. Hasimatos thyroiditis is an autoimmune destruction of the thyroid gland. This may lead to inadequate production of thyroid hormone, leading to hypothyroidism. This is not always true. You can have hashimatos thyroiditis but not develop hypothyroidism, though, hashimatos thyroiditis is the commmonest cause of hypothyriodism in the USA. Hashimotos thyroditis affects about 2% of the USA population. Hashimotos thyroiditis can affect many organs of the body with or without hypothyroidism. It can cause hives, encephalitis, encephalopathy, malaise, fatigue, brain fog, body aches, joint pain, muscle pain, low grade fevers, cold intolerance, hair loss etc.
Hashimatos thyroiditis with or without causing hypothyroidism can lead to the above mentioned symptoms including hair loss. Hashimatos thyroiditis may or may not cause hypothyroidis and hypothyroidism can occur independent of hashimatos thyroiditis (without autoimmune process).
Good Luck

It can. Be sure to take the right dose of your thyroid medicine and check your TSH periodically to minimize this effect.