Hemorrhoids are painful, swollen veins in the lower portion of the rectum or anus.

This condition is very common, especially during pregnancy and after childbirth. Hemorrhoids result from increased pressure in the veins of the anus. The pressure causes the veins to bulge and expand, making them painful, particularly when you are sitting.

The most common cause is straining during bowel movements. Hemorrhoids may result from constipation, sitting for long periods of time, and anal infections. In some cases they may be caused by other diseases, such as liver cirrhosis.

Internal hemorrhoids occur just inside the anus, at the beginning of the rectum. External hemorrhoids occur at the anal opening and may hang outside the anus.

Symptoms of hemorrhoids include:

• Anal itching
• Anal ache or pain, especially while sitting
• Bright red blood on toilet tissue, stool, or in the toilet bowl
• Pain during bowel movements
• One or more hard tender lumps near the anus

A doctor can often diagnose hemorrhoids simply by examining the rectal area. If necessary, tests that may help diagnose the problem include:

• Stool guaiac (shows the presence of blood)
• Sigmoidoscopy
• Anoscopy