Sweating helps your body stay cool it is perfect natural we sweat more in warm weather than cold. When you exercise you sweat in some situations if you get angry nervous embarrassed or afraid.
Excessive sweating occur without any reason it can affect your hands, feet and armpit, it is called primary or focal Hyperhidrosis.
People that have overactive sweat glands suffer badly of it, emotional and physically.
The good news is it is treatable with injection into the armpit