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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

A varicocele is an enlarged, twisted vein (varicose vein) in the scrotum, most often on the left side. It may feel something like

Varicose veins are twisted, enlarged veins near the surface of the skin. They're most common in the legs and ankles. They usually

The vas deferens is a narrow, muscular tube that connects the testicles (where sperm is produced) to the urethra. During

Vasculitis is inflammation of the blood vessels. This inflammation can damage and narrow the blood vessels, causing a rash, a