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Rotavirus infection affects the digestive tract and is the most common cause of vomiting and severe diarrhea in babies and young

Rubella, also called German measles, is a contagious infection caused by a virus. It usually causes a mild illness with a fine

Rhinitis is an inflammation of the nasal passages that is most often caused by allergies or respiratory infections. You may have a

Electrical pulses in the heart are controlled by special groups of cells called nodes. The SA (sinoatrial) node generates an

Salivary glands produce saliva, which moistens the mouth to help a person chew and swallow food. Saliva also contains substances

Saturated fats are those that become hard at room temperature. They are found mostly in animal-based foods (such as meat, butter

The sciatic nerve is the largest nerve in the body, formed by nerve roots coming out of the spinal cord in the lower back. The

Scarlet fever is an infection that can happen with strep throat. It is caused by the same bacteria that cause strep throat

The scrotum is a sac that hangs below the base of the penis. It contains the two oval organs (testicles) that produce sperm and

Scleroderma is an uncommon disease in which parts of the skin and blood vessels break down and are replaced by fibrous tissue