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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

Respiratory distress syndrome (RDS) of infants, sometimes called hyaline membrane disease, is a serious condition that most

Respiratory syncytial virus infection (RSV) is a common childhood infection that anyone can get. It can cause a runny nose

Referred pain occurs when a problem in one place in the body causes pain that travels down a nerve and is felt in another place

Retinal detachment means that the retina—a thin layer of nerve tissue at the back of your eye—has detached, or pulled away. This