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

Ultraviolet radiation - invisible rays that come from the sun. Uv radiation can damage the skin and cause melanoma and other types of skin cancer.

Upper gi endoscopy - examining into the esophagus, stomach, and duodenum with an endoscope. (see also endoscopy.)

Upper limb tension test (ultt) - test to assess pain.

Urea breath test - test used to detect helicobacter pylori infection. The test measures breath samples for urease, an enzyme h. Pylori produces.

Ureters - two tubes that carry urine from the kidneys to the bladder.

Urethra - narrow channel through which urine passes from the bladder out of the body.

Urge incontinence - the inability to hold urine long enough to reach a restroom.

Urgent surgery - an operation performed immediately as a result of an urgent medical condition. (see also emergency surgery.)

Urinary retention - the inability to empty the bladder.

Usher’s syndrome - a hereditary disease that affects hearing and vision.

Uterus (also called the womb.) - the uterus is a hollow, pear-shaped organ located in a woman's lower abdomen, between the bladder and the rectum, that sheds its lining each month during menstruation and in which a fertilized egg implants and grows into a fetus.