Diarrhea happens to everyone, but diarrhea that is not caused by IBD will typically resolve itself in a few days. With IBD, diarrhea will not abate on its own. For most people, the normal range for bowel movements is between one and three a day. During a flare-up, people with IBD could experience many more -- in a severe case, that could mean 10 or more bouts of diarrhea a day. Diarrhea that is accompanied by blood or abdominal pain should always be discussed with your physician as soon as possible.