What Causes Severe Sweating On Palm And Underarm?

IM 15 AND I SWEAT ALOT MY PALMS ARE CONSTANTLY SWEATY I SWEAT UNDER MY UDER ARMS EVERYDAY TO THE POINT WERE I HAVE TO CHANGE SHIRTS BECAUSE ITS A 3RD OF THE WAY DOWN MY SHIRT MY FEET ALSO SWEAT AS MUCH AS MY HANDS EVEN IF I FEEL COLD OR ITS NOT HOT I STILL SWEAT ALOT IS THERE ANYTHING I CANT TAKE TO REDUCE THE SWEATING?