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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. |
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