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Restless legs syndrome, or RLS, is a disorder that makes you want to move your legs or other parts of your body when you lie down

Refractive error is a condition that causes blurred vision when light rays entering the eye meet in front of or behind the retina

Regurgitation occurs when food particles and liquid back up unexpectedly from the stomach into the esophagus and mouth

Diarrhea and vomiting can cause your body to lose large amounts of water, nutrients, and essential minerals called electrolytes

A stye is an infection in the tiny oil glands that surround the base of each eyelash along the edge of the eyelid. A stye begins

A subdural hematoma is an increase in pressure within the skull that happens when blood collects in the space between the skull

Reactive arthritis is a condition that may be triggered by a bacterial infection in the urinary or gastrointestinal tracts. It

Relapse is the reappearance of or increase in symptoms in a person with an illness or disease after a period of improvement.

Relapsing fever is an infectious disease that can be passed to humans by ticks. Relapsing fever is most common in the western

Relapsing-remitting multiple sclerosis is a form of MS in which attacks (relapses) come and go over time. An MS attack is a period