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Overactive thyroid, also known as hyperthyroidism, occurs when the thyroid gland produces an excess of thyroid hormone, leading to symptoms such as weight loss, rapid heartbeat, tremors, anxiety, and heat intolerance. Treatment for overactive thyroid aims to normalize thyroid hormone levels, alleviate symptoms, and prevent complications such as heart problems and bone loss. Common treatment options include antithyroid medications like methimazole or propylthiouracil, which inhibit the production of thyroid hormones.