Hi. my 9 yrs. old son has been sweating at every little activity as long as i can remember. he's 4 feet 6 inches tall and weighs 105 pounds. he's not a very active boy at all times and likes to play his video and computer games every chance he gets. for instance today at the mall i noticed he was walking and was perspiring on his head even though the mall was cool. i will be calling his dr. tomorrow, but i was wondering can anyone tell me what might be some of the causes that kids can over perspire. he does not seem to have the signs of diabetic because he drinks water moderatly and does not urinate in excess and has not lost weight. (thank god) so hopefully its not anything serious. i thank you in advance.