 [ Symptoms ] used a heating pad on my stomach for pain the next day i had very sudden diarrhea coincidence or not  i never before used a heating pad on my stomach it was a low setting today i had one sharp cramp then diarrhea since then i have been okay [ Disease ] the description of the history indicates your son might be having some psychological stress disorder oppositional defiant disorder behavior problems or depression you might consult with a pediatric psychiatrist for your son who might be able to examine him and provide proper counselling and specific treatment