What is the best cure for over-sweating hands?

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I have a friend whose hands are always wet due to over-sweating. There is no time that her hands are not sweating so she really avoids shaking hands coz it really feels quite awful if you shake hands with her. Is it an illness? Would you know an effective cure for this, because the doctor told her that this is a kind of abnormality in her sweat gland and recommended an surgery. Imagine a simple case that seems to me is now requiring surgery. but, maybe you have alternative heal to help her. Kindly share.