Can't believe I'm posting in here...
From a
Web MD article on constipation:
Quote:
Originally Posted by Poop Expert
Generally, constipation is difficult to define clearly because as a symptom it varies from person to person. - The frequency of bowel movements also varies greatly, ranging from 3 movements per day to 3 per week. Generally, if your bowel has not opened for 3 successive days, the intestinal contents harden, and you may have difficulty or even pain during defecation.
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And wikipedia comes through with a fantastic chart: