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Upper gastrointestinal (UGI) endoscopy is a test that allows the doctor to look at the interior lining of the upper digestive

Untreated water is drinking water that has not been chemically treated, filtered, or boiled to eliminate infectious bacteria

An undescended testicle (cryptorchidism) is one that remains inside the body and has not moved down into the scrotum. Normally the

A person who is unconscious is not aware of what is going on around him or her. He or she may not be able to make purposeful

An umbilical hernia is a bulge in the abdominal wall near the navel (umbilicus) that sometimes contains abdominal tissue, a loop

The umbilical cord is the ropey structure that connects the fetus to the placenta in the mother's uterus. Blood vessels in the

Ultraviolet light comes from the sun's rays but is invisible to humans. Two of the three forms of ultraviolet light, UVA and UVB

Ultrasound is a test that uses reflected sound waves to produce an image of organs and other structures in the body. It does not

Ulcerative colitis makes swelling, inflammation, and sores in the lining of the large intestine (colon) and causes diarrhea, belly

An ulcer is a sore that develops on the skin (such as the skin around the ankles) or on a mucous membrane (such as inside the