Hyperthyroidism can cause hair loss. When there is hyperthyroidism (such as Graves’ disease), the thyroid hormone increases, the 5-alpha reductase enzyme in the body is elevated or its action is enhanced, and the testosterone in the body is converted into dihydrotestosterone, which will cause the hair follicles to gradually atrophy, leading to pathological hair loss. In addition Graves disease is an autoimmune disease, autoimmune diseases are prone to the symptoms of hair loss. Hyperthyroidism is also associated with stress and emotional factors that can also cause hair loss. For most hyperthyroidism patients, hair loss symptoms can be improved if thyroid hormone levels are gradually controlled to normal. If hyperthyroidism is under control but hair loss persists, it is recommended to visit the hospital to clarify the cause of the condition.