Excessive sweating or hyperhidrosis can be caused by poor regulation of body temperature. Some people with this condition sweat heavily.
Scientists believe that this happens due to what is called an autonomic dysfunction within the hypothalamus, the area in the brain that controls sleep and regulates sweating, bowel movements, and other body functions.
Fluctuations in temperature and sweating can also occur when people with fibromyalgia experience stress. Stress aggravates not only sweating but also pain and other symptoms of fibromyalgia.

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