Hyperthyroidism is a pathological condition characterized by the excessive synthesis and release of thyroid hormones by the thyroid gland. It is identified by high or normal thyroid radioactive iodine uptake, known as true hyperthyroidism or thyrotoxicosis with hyperthyroidism. In cases of thyrotoxicosis without hyperthyroidism, the cause can be either an extrathyroidal source of thyroid hormone or the release of preformed thyroid hormones into the...
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