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Why do I sweat while I'm sleeping?

I don't have a sweating problem, I work out and don't even sweat that much then. But when I sleep, I sweat a lot and wake up and my hairs all wet. Is there something wrong with me? Why do I sweat in my sleep?
Sweating at night ('nightsweats') is a relatively common problem. While this can be a normal process that some people have, this can also be a sign of a disease (which can be serious). I would recommend that you discuss this with your primary care doctor at your next visit. As mentioned above, this can be normal for some people. If you have always had this, then it is likely a sign of just your normal body temperature regulation (sweating is how the body eliminates heat). However, if this is a new change for you -- this is worrisome and should be investigated by your doctor. There are a few diseases that classically cause nightsweats. Tuberculosis is one -- which is a lung infection caused by a bacteria. Really, any infection can cause it -- so if you are having fevers or other symptoms please see your doctor. Nightsweats are also known as a "b symptom" along with weight loss and fevers -- the three of them together can be a sign of lymphoma (a type of blood cancer). This is relatively rare. A common cause of nightsweats is also menopause in women of the appropriate age. Autoimmune disease can rarely cause it as well. Please talk to your doctor for more information about how this could affect you.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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