(HealthDay News) -- Constipation refers to difficult or infrequent bowel movements.

Insufficient fiber and fluids in the diet are the most common causes of constipation, according to the American Society of Colon and Rectal Surgeons. Certain supplements and medications may also affect the regularity of bowel movements, including blood pressure medications, painkillers and antidepressants.

The ASCRS says the best way to get regular again is to increase daily dietary fiber, making sure to drink plenty of fluids. Bran, whole grains and whole wheat, fruits and vegetables are all high in fiber and will help constipation. Fiber supplements may also help, but laxatives should be used under a doctor's guidance, the society says.