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Heart valves can malfunction on one of two ways: They can fail to close completely, allowing blood to flow backward, or they can become damaged, limiting blood flow.

Primary pulmonary hypertension (PPH) is high blood pressure in the lungs. It's a rare lung disorder in which the blood vessels in the lungs narrow and the pressure in the pulmonary artery rises far above normal levels. Pulmonary hypertension is a chronic and life-changing disease that can lead to heart failure if it's not treated.

Detailed information on cancer, including primary and metastatic cancers, and benign and malignant tumors.

Cirrhosis is when scar tissue replaces healthy liver tissue. This stops the liver from working normally.

Detailed information on the most common types of screening tests for common diseases.

A neurological exam may be performed with instruments, such as lights and reflex hammers, and usually does not cause any pain.

Cholangitis is swelling (inflammation) of the bile duct system. In most cases, cholangitis is caused by a bacterial infection. The infection often happens suddenly. But, in some cases, it may be long-term (chronic).

Some practical and helpful tips to help you or a loved one cope with a cancer diagnosis.

Most allergic reactions are a result of an immune system that responds to a "false alarm."