Excessive sweating or hyperhidrosis is a condition where certain glands sweat beyond what the body requires.
Hyperhidrosis is unrelated to heat. You will sweat even if it's cold.
The medical causes of excessive sweating are often related to a genetic condition and can affect one's social interaction and cause emotional distress.
The part of the body that is at the root of excessive sweating is our autonomous nervous system, among other things it affects our blood pressure, heart rate, anxiety level.
The condition can also be aggravated by alcohol , drugs and certainly caffeine.
Excessive sweating is a common problem and the areas effected are usually the arm pits, face, palms, under the breasts, soles and groin. When it's really bad it causes public embarrassment and / or hinders social interaction.
Some treatments include botox injections, and even surgery!
But before you take such drastic actions I suggest you visit stop excessive sweating and start living .
They have excellent advice and a completely natural method on how to stop excessive sweating.
Anyway, hope that answers some of your questions about the medical causes of excessive sweating, and that you manage to stop your excessive sweating.
All the best.