Ulcer
A sore on the skin surface or on the stomach lining.

Ulcerative Colitis
A serious disease that causes ulcers and irritation in the inner lining of the colon and rectum. See also Inflammatory Bowel Disease (IBD).

Upper GI Endoscopy
Looking into the esophagus, stomach, and duodenum with an endoscope. See also Endoscopy.

Upper GI Series
X-rays of the esophagus, stomach, and duodenum. The patient swallows barium first. Barium makes the organs show up on x-rays. Also called barium meal.

Urea Breath Test
A test used to detect Helicobacter pylori infection. The test measures breath samples for urease, an enzyme H. pylori makes.