Over-response to hyperthyroidism treatment.However it happens, these antibodies affect the thyroid's ability to produce hormones. Scientists aren't sure why this happens, but it's likely a combination of factors, such as your genes and an environmental trigger. Sometimes this process involves your thyroid gland. Autoimmune disorders occur when your immune system produces antibodies that attack your own tissues. The most common cause of hypothyroidism is an autoimmune disorder known as Hashimoto's thyroiditis. Hypothyroidism may be due to a number of factors, including:Īutoimmune disease. Hypothyroidism results when the thyroid gland fails to produce enough hormones. These hormones also influence the control of vital functions, such as body temperature and heart rate. Hormones produced by the thyroid gland - triiodothyronine (T3) and thyroxine (T4) - have an enormous impact on your health, affecting all aspects of your metabolism. Your thyroid is a small, butterfly-shaped gland situated at the base of the front of your neck, just below your Adam's apple. ![]() There can be a number of causes, including autoimmune disease, hyperthyroidism treatments, radiation therapy, thyroid surgery and certain medications. When your thyroid doesn't produce enough hormones, the balance of chemical reactions in your body can be upset. And over time, the dose you need may change. Initially, it's important to make sure you're receiving the correct dose of medicine. ![]() If you're receiving hormone therapy for hypothyroidism, schedule follow-up visits as often as your doctor recommends. See your doctor if you're feeling tired for no reason or have any of the other signs or symptoms of hypothyroidism, such as dry skin, a pale, puffy face, constipation or a hoarse voice.
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