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The feeling of wanting to throw up (vomit).
Dead tissue that surrounds healthy tissue in the body.
Necrotizing Enterocolitis
A condition in which part of the tissue in the intestines is destroyed. 
Neonatal Hepatitis
Irritation of the liver with no known cause.  
Abnormal growth of tissue that may or may not cause cancer. Also called tumor.
nerve cell
Disease of the nervous system.
a decrease in the number of white blood cells
Noninsulin-dependent Diabetes Mellitus (NIDDM)
The most common form of diabetes mellitus; occurs in people who are over age 40. Most of the people who have this type of diabetes are overweight.either their bodies do not produce enough insulin or their body cells are resistant to the action of insulin.  Synonyms: adult-onset diabetes, maturity-onset diabetes, ketosis-resistant diabetes, stable diabetes and type II diabetes mellitus.
Nonsteroidal anti- inflammatory drugs (NSAIDs)
A group of medications used to reduce inflammation that causes joint pain, stiffness, and swelling.
Nonulcer Dyspepsia
Constant pain or discomfort in the upper GI tract. Possibly caused by muscle spasms.
Nutcracker Syndrome
Abnormal muscle tightening in the esophagus.