Subclinical and overt hyperthyroidism is present in 1.6% and 1.3% of the Indian population according to one study. The equivalent number is 1% in an American population.
Hyperthyroidism or thyrotoxicosis is an overactive thyroid where the thyroid gland produces too much of the thyroid hormones. Hyperthyroidism can accelerate your body's metabolism, causing unintentional weight loss and a rapid or irregular heartbeat.
Hyperthyroidism is classified into two types:
Primary Hyperthyroidism is essentially Graves' disease which accounts for 60-80% of all cases of hyperthyroidism. It is an autoimmune disorder.
Secondary Hyperthyroidism can be due to a nodule, goitre or any rare cause.
Read more about Graves' Disease here
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