A virus that occurs mostly in people who share needles with infected people. Only people who have hepatitis B can get hepatitis D.

A test for lactose intolerance that measures breath samples for hydrogen levels. The body makes too much hydrogen when lactose is not broken down properly in the small intestine.

Transmitted through genes from parents to offspring.38

A plant-derived adhesive used in ostomy appliances.

A feeling of fullness in the anus and rectum with occasional pain caused by muscle spasms.

A huge, swollen colon that results from several different conditions. In children, megacolon is more common in boys than girls. See Hirschsprung disease.

Blood in stool that is not visible to the naked eye. It may be a sign of inflammation or a disease such as colorectal cancer.

A hole in the wall of an organ.

Irritation of the rectum.

A condition in which the rectum slips so that it protrudes from the anus.