What is it that causes my scalp to itch uncontrollably everytime i sweat?

Dermatitis: Certain skin conditions like seborhheic dermatitis can make the scalp itch, increased often with sweating. Try using head and shoulders shampoo or selsun blue, and you may be pleasantly surprised over the next few weeks. If it persists, see a dermatologist. Good luck.

Itchy scalp: May have dandruff or other condition that inflames scalp that is further irritated by salty sweat. If otc dandruff shampoos haven't helped, see pcp or dermatologist for rx help—antifungal shampoo or steroid shampoo/ foam to calm inflammation & reduce/ eliminate itching.