This can cause some of your body’s functions to slow down. Your thyroid gland is underactive and can’t produce enough of its hormones. Hypothyroidism is the opposite of hyperthyroidism. If you have radioactive iodine treatment or surgery that destroys your thyroid gland, you’ll develop hypothyroidism and need to take thyroid hormone daily. This may return your thyroid levels to typical ones. Surgery can be performed to remove your thyroid gland. But this option isn’t safe for people who are pregnant or breastfeeding. As your thyroid gland takes in iodine, it also pulls in the radioactive iodine, which damages the gland. You can take it as a pill or liquid by mouth. A large dose of radioactive iodine damages your thyroid gland. Antithyroid drugs such as methimazole (Tapazole) can prevent your thyroid from producing its hormones and reduce symptoms. Treatments for hyperthyroidism destroy your thyroid gland or block it from producing its hormones. This low level of radioactivity resolves quickly and isn’t dangerous for most people. Taking in a lot of radioactive iodine is a sign that your thyroid is overactive. Your thyroid takes in iodine to produce its hormones. High thyroxine and low TSH levels can indicate that your thyroid gland is overactive.Ī doctor might also give you radioactive iodine by mouth or as an injection and then measure how much of it your thyroid gland takes up. Your pituitary gland releases TSH to stimulate your thyroid to produce its hormones. overactive thyroid nodules, also known as toxic nodular goiter or multinodular goiterĮxcessive thyroid hormone production may lead to symptoms that can include:Ī doctor or healthcare professional can diagnose hyperthyroidism by running tests that measure your levels of thyroid hormone or how effectively your thyroid is working.Ī blood test measures the levels of thyroid hormone (thyroxine, or T4) and thyroid-stimulating hormone (TSH) in your blood.taking too much thyroid hormone medication.Nodules on your thyroid - a condition called toxic nodular goiter or multinodular goiter - can also cause the gland to overproduce its hormones. Graves’ disease is the most common cause of hyperthyroidism, affecting about 70 percent of people with an overactive thyroid. Hyperthyroidism affects between 1 and 3 percent of people in the United States and is more common in women. This can cause many of your body’s functions to speed up. In hyperthyroidism, your thyroid gland is overactive.
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