There are many, many causes of night sweats...such as changes in medications, viruses, weight changes, hormonal changes and many more.
Here are some references that may assist you in narrowing your search:
http://sleepdisorders.about.com/cs/sweats/a/sweatbasics.htm
http://www.diagnose-me.com/cond/C521732.html
Please let me know if you have any other questions or have any additional information that may assist me in assisting you.
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BarbaraTaylor, ARNP, CAP
My suggestions are not intended to replace consultation with your physician.
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