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Reye syndrome is a very rare but serious disease that is most likely to occur in children younger than 15 years of age. The exact

The surface of red blood cells contains markers that the immune system can recognize—one of these markers is the Rh factor (Rh [D]

People without Rh factor on the surface of their blood cells are Rh-negative and have Rh incompatibility with blood that is Rh

Rh sensitization happens if you have Rh-negative blood and are exposed to Rh-positive blood. Because the blood types don't match

Rheumatic fever results from an infection caused by certain strains of streptococcal bacteria and may be triggered by a strep

Rheumatoid arthritis is a type of arthritis in which your body's immune system attacks healthy tissue in your joints. This makes

The retina is a thin nerve membrane that detects light entering the eye. Nerve cells in the retina send signals of what the eye

A ruptured (or perforated) eardrum is a tear or hole in the membrane of the middle ear. It's usually as a result of injury (trauma

Rickets is a rare disease that results in soft, weak, and pliable bones. It is caused mainly by a lack of vitamin D. Rickets most

Ringworm of the scalp is an infection that grows in the outer layer of the scalp and in the hair. It is caused by a fungus, not by