Diseases and Conditions

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Rhinitis
Rhinitis is a reaction that occurs in the eyes, nose, and throat when airborne irritants such as pollen or mold trigger allergy symptoms.
Raynaud's Phenomenon
This disorder affects blood flow to the fingers and less frequently to the ears, toes, nipples, knees, or nose. Exposure to cold and emotional upset are the triggers.
Reactive Arthritis (Reiter's Syndrome)
Reactive arthritis, also known as Reiter's syndrome, is a type of arthritis that occurs as a reaction to an infection somewhere in the body.
Rheumatic Heart Disease
Rheumatic heart disease is a condition in which the heart valves have been permanently damaged by rheumatic fever.
Rosacea
Detailed information on the most common types of rosacea, including prerosacea, vascular rosacea, inflammatory rosacea, and rhinophyma
Retinitis Pigmentosa
Detailed information on retinitis pigmentosa, including causes, symptoms, diagnosis, and treatment
Refractive Errors
Astigmatism is one type of refractive error. It's a condition in which an abnormal curvature of the cornea can cause two focal points to fall in two different locations—making objects up close and at a distance appear blurry.
Rocky Mountain Spotted Fever
Detailed information on Rocky Mountain spotted fever, including symptoms, diagnosis, treatment, and prevention
Rubella (German Measles)
Detailed information on rubella, including symptoms, diagnosis, treatment, and prevention
Repetitive Motion Injury
Repetitive motion injuries, also called repetitive stress injuries, are temporary or permanent injuries to muscles, nerves, ligaments, and tendons caused by performing the same motion over and over again.