Glossary N-O

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Nausea (NAW-zee-uh)
The feeling of wanting to throw up (vomit).

Necrosis (nuh-KROH-sis)
Dead tissue that surrounds healthy tissue in the body.

Necrotizing Enterocolitis (NEK-roh-TY-zing EN-tuh-roh-koh-LY-tis)
A condition in which part of the tissue in the intestines is destroyed. Occurs mainly in underweight newborn babies. A temporary ileostomy may be necessary.

Neonatal Hepatitis (nee-oh-NAY-tul heh-puh-TY-tis)
Irritation of the liver with no known cause. Occurs in newborn babies. Symptoms include jaundice and liver cell changes.

Neoplasm (NEE-oh-plaz-um)
New and abnormal growth of tissue that may or may not cause cancer. Also called tumor.

Nissen Fundoplication (NIH-sun FUN-doh-plih-KAY-shun)
An operation to sew the top of the stomach (fundus) around the esophagus. Used to stop stomach contents from flowing back into the esophagus (reflux) and to repair a hiatal hernia.

Nontropical Sprue (NAWN-TRAH-pih-kul SPROO)
See Celiac Disease.

Nonulcer Dyspepsia (nawn-UL-sur dis-PEP-see-uh)
Constant pain or discomfort in the upper GI tract. Symptoms include burning, nausea and bloating, but no ulcer. Possibly caused by muscle spasms.

Norwalk Virus (NAWR-wawk VY-rus)
A virus that may cause GI infection and diarrhea. See also Gastroenteritis.

Nutcracker Syndrome (NUT-KRAK-ur sin-drohm)
Abnormal muscle tightening in the esophagus.

Obstruction (ub-STRUK-shun)
A blockage in the GI tract that prevents the flow of liquids or solids.

Occult Bleeding (uh-KULT)
Blood in stool that is not visible to the naked eye. May be a sign of disease such as diverticulosis or colorectal cancer.

Oral Dissolution Therapy (OR-ul dih-soh-LOO-shun theh-ruh-pee)
A method of dissolving cholesterol gallstones. The patient takes the oral medications chenodiol (KEE-noh-DY-awl) (Chenix) and ursodiol (ERS-oh-DY-awl) (Actigall). These medicines are most often used for people who cannot have an operation.

Ostomate (AH-stuh-mayt)
A person who has an ostomy. Called ostomist in some countries.

Ostomy (AH-stuh-mee)
An operation that makes it possible for stool to leave the body through an opening made in the abdomen. An ostomy is necessary when part or all of the intestines are removed. Colostomy and ileostomy are types of ostomy.

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