The most common cause of hyperthyroidism is:

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Graves' disease is the most common cause of hyperthyroidism, accounting for approximately 85% of all cases. The disease is caused by an autoimmune disorder in which the body's immune system attacks the thyroid gland, leading to an overproduction of thyroid hormones. Multiple sclerosis, Addison's disease, and Cushing's disease are not associated with hyperthyroidism. The most common cause of hyperthyroidism is Graves' disease, an autoimmune disorder where antibodies stimulate the thyroid gland to produce too much thyroid hormone. Multiple sclerosis, Addison's disease, and Cushing's disease are not related to hyperthyroidism.

The Most Common Cause of Hyperthyroidism Is