Diarrhea without fever

Patient: My son has had diarrhea for four days now, he was taken to the doctor on the first day it occurred, he has no fever, he just states how his tummy hurts severely, fluids has been given to him daily, light diet also, but yet he stills complain and still has severe diarrhea.

Symptoms: Diarrhea with stomach aches lasting 4 days