(HealthDay News) — Hemorrhoids occur when blood vessels in the rectum become swollen and tender.

The American Society of Colon and Rectal Surgeons says common risk factors for hemorrhoids include:

• Having chronic constipation or diarrhea, or pushing too hard during bowel movements.
• Being pregnant.
• Having family members who have had hemorrhoids.
• Sitting on the toilet for long periods.
• Overusing enemas or laxatives, which can trigger problems with bowel function.