Introduction
Constipation is defined as no bowel movements for three days (for adults).  This is a fairly extreme definition though, and depending on your usual pattern, you may not have to wait three days to decide you are constipated.  Any change from your normal routine should be noted.

Causes
There can be a number of causes of constipation, some more serious than others.  Most often, constipation is temporary.  If you experience persistent constipation, you should consult your health care professional.