What Is an Overactive Thyroid?

Hyperthyroidism happens when the thyroid becomes overactive and produces too much of its hormones. Hyperthyroidism affects women five to 10 times more often than men and is most common in people younger than 40.

People with hyperthyroidism have problems that reflect overactivity of the organs of the body, resulting in symptoms such as sweating, feeling hot, rapid heartbeats, weight loss and sometimes eye problems.

What are the causes of hyperthyroidism?

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