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In heart valve disease, one or more of the valves in your heart doesn't work properly. Your heart has four valves that keep blood flowing in

Esophageal cancer is cancer that occurs in the esophagus — a long, hollow tube that runs from your throat to your stomach. Your esophagus he

Ewing (YOO-ing) sarcoma is a rare type of cancer that occurs in bones or in the soft tissue around the bones. Ewing sarcoma most often begin

Radiation enteritis is inflammation of the intestines that occurs after radiation therapy. Radiation enteritis causes diarrhea, nausea, vomi

Schizophrenia is a serious mental disorder in which people interpret reality abnormally. Schizophrenia may result in some combination of hal

Salivary gland tumors are growths of abnormal cells (tumors) that begin in the salivary glands. Salivary gland tumors are rare.

RS Pharmaceutical's answer: Prevention There is currently no vaccine to protect people against MERS. But scientists are working to develop

Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight o

Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight o

Ventricular fibrillation is a type of irregular heart rhythm (arrhythmia). During ventricular fibrillation, the lower heart chambers contrac

A vertebral tumor is a type of spinal tumor affecting the bones or vertebrae of the spine. Spinal tumors that begin within the spinal cord o

Premature ventricular contractions (PVCs) are extra heartbeats that begin in one of the heart's two lower pumping chambers (ventricles). The

Premature ventricular contractions (PVCs) are extra heartbeats that begin in one of the heart's two lower pumping chambers (ventricles). The

RS Pharmaceutical's answer: Self assembly of virus capsids follows two basic patterns: helical symmetry, in which the protein subunits and t

RS Pharmaceutical's answer: Signs and symptoms of respiratory syncytial virus infection most commonly appear about four to six days after ex

RS Pharmaceutical's answer: Viruses constantly change through mutation. When a virus has one or more new mutations it’s called a variant of

Chronic fatigue syndrome, also known as myalgic encephalomyelitis or ME/CFS, is a complicated disorder. It causes extreme fatigue that lasts