Well don't take medication to stop sweating because this way you may cause fever to your self .Also keepin mind that when we sweat our bodies throw off useless or harmful things for us.
Now if the sweating in the palms is accompanied by other symptoms, it may be due to hyperthyroidism (tachypnea, increased appetite), diabetes (excessive thirst, blurred vision), menopause (irregular period, fallen libido) or lymphoma (I don't know the other symptoms that can accompany the palm sweating).
If you some of the symptoms I described I think the best you have to do is to go to a doctor just to be sure.But again just the hand sweating means nothing on its own ,the only thing to remember as I said before is to not take medication to stop sweating because it is unhealthy.Also as the other members said in most of the cases it is associated with stress,so perhaps doing more void meditation to control your thoughts better and blue energy (because it is relaxing) will solve the problem!!!