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Unstable angina is a change in your usual pattern of stable angina. Your symptoms do not happen at a predictable time. For example

An upper gastrointestinal (UGI) series is a multi-step test a doctor uses to examine the upper portion of a person's

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

Upper airway resistance syndrome (UARS) is a sleep disorder caused by a breathing problem. A person who has UARS may snore and may

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

The results of some medical tests are reported in units per milliliter (U/mL). A unit is an arbitrary amount agreed upon by

The results of some medical tests are reported in units per liter (U/L). A unit is an arbitrary amount agreed upon by scientists

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