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Urethritis is inflammation of the tube that carries urine from the bladder to outside of the body (urethra). It can be caused by a

The urethra is the tube that carries urine from the bladder to outside of the body. Urine is produced in the kidneys and flows

The ureters are small tubes, each about 10 in. (25 cm) long, that carry urine from the kidneys to the bladder.

Urea is a waste product that is made in the intestines and liver when protein breaks down. The kidneys then eliminate urea from

A viral infection is caused by a virus and is often the cause of minor illness, such as a cold or a stomach infection. A viral

Ventricular septal defect (VSD), a heart problem that develops before birth (congenital), is an opening in the wall that separates

The Vaccine Adverse Event Reporting System (VAERS) is a cooperative program for vaccine safety of the Centers for Disease Control

Vestibular neuritis is an inflammation of the vestibular nerve, which is located in the inner ear and carries balance signals from

A Valsalva maneuver is an effort to exhale without letting air escape through the nose or mouth. People often use a Valsalva

Vanishing twin syndrome is a condition in which one of two fetuses disappears sometime during the first 12 weeks of a pregnancy