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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

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

Remission refers to periods of time when a person with a long-lasting illness does not have symptoms. During a remission, a person

Renin is an enzyme produced by the kidneys that helps control blood pressure. Renin works by activating other chemicals to narrow