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Term	Description
Ubiquinone	See Coenzyme Q10.
Ulcer	An area of the stomach eroded by stomach acid. Symptoms include indigestion and chest and/or abdominal pain, which can be worse before or after eating and strong enough to awaken someone who is asleep. Diagnosis is usually confirmed by an endoscopy, which views the lining of the stomach and duodenum. The following increase risk for developing an ulcer: a family history, smoking, heavy alcohol consumption and certain drugs such as aspirin. Helicobacter pylori, a bacterium found in the stomach, can also be responsible.
Ulcerative colitis	See Colitis.
Uric acid	A form of nitrogenous wastes, uric acid is an odorless compound formed in the body as a result of protein metabolism. It is present in small amounts in human urine; high levels can result in kidney stones and Gout.