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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

Sprue is a disorder in which the intestines are unable to absorb nutrients from food. It can cause loss of appetite, diarrhea

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

Rocky Mountain spotted fever is a bacterial infection passed to humans by wood ticks and dog ticks that can lead to life

Root canal treatment (also called a root canal) is a dental procedure done to remove the infected core (pulp) of a tooth. This

The roots of a tooth, which extend below the gum line and anchor a tooth into the jawbone, have nerves and blood vessels that

Roseola (roseola infantum) is a mild viral illness that affects young children. When a child has roseola, he or she has a sudden