Many factors can dispose a person to constipation. Some can easily be prevented by changing habits and lifestyle (although the role of lifestyle factors may not be as important as once thought). Often, the cause has to do with physiological problems or diseases.
Common Causes of Chronic Constipation:
Lack of exercise. People who exercise regularly generally don’t develop constipation. Basically, the colon responds to activity. Good muscle tone in general is important for regular bowel movements. Source
Chronic Constipation: Causes, and Symptoms
Chronic Constipation Treatment