Abdomen (AB-doh-men): The area of the stomach.

Barium enema (BAR-ee-um EN-uh-muh): An x ray of the bowel using a liquid called barium to make the bowel show up better. This test is also called a lower GI (for gastrointestinal) series.

Bowel: The part of the digestive system that makes and stores stool. It is also called the large intestine.

Endoscopy (en-DAH-skuh-pee): A test to look at the inside of the bowel.

Functional: Refers to how something works.

Mucus: A clear, sticky discharge. It might look white.

Syndrome (SIN-drome): A group of symptoms.