What is the cause of palms and hand sweating

Our sweat glands sweat to help us control our core body temperature.  However, excess or uncontrolled sweating is known as hyperhidrosis.  The list of possible causes, beyond social embarrassment feeding cyclically upon itself, is quite long & varied.  Check out the Wikipedia link for some things to consider as instigators.  Options for treatment range from over-the-counter remedies to prescription medications to surgery.  Best to check w/your family physician and get referred if standard therapies aren't enough (or lead to intolerable side effects).  Good luck!  (assuming you're asking b/c you're suffering from this and to anyone who is).

Dear Dr.Alvin,

Thanks for your reply and as you guessed it right I sweat frequently through my palms and foot from 4th grade and still I sweat a lot and when panic or in anxiety i sweat more through my palms and foot. But I do not suffer from any disease because of this and only worried about social stigma. I am aged 38 now and do not like surgeries. can you suggest me certain oral creams or medication which will control this.