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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

A subarachnoid hemorrhage is the bursting of a blood vessel in the brain. This results in sudden bleeding into the space between

Systolic blood pressure refers to the pressure of blood in the artery when the heart contracts. It is the top (and higher) number

The possibility of suicide is most serious when a person has a plan for suicide. A plan for suicide includes: Having the means

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

A person who is susceptible (or has susceptibility) is easily affected by a disease, is more likely to get a disease, or lacks