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Syncope is a loss of consciousness (fainting) that occurs when blood pressure drops very low and not enough blood reaches the

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

During suprapubic aspiration, a needle is inserted through the skin into the bladder to withdraw a urine sample. Local anesthesia

A suntan is a darkening of the skin in reaction to exposure to the ultraviolet (UV) rays in sunlight. The skin pigment melanin

A suppository is a small capsule or tablet that contains medicine. A suppository is placed in a body passage, such as the vagina

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

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

Sun protection factor (SPF) is a number on sunscreen labels that shows how long skin can be in the sun and maintain a low risk for

Supraventricular tachycardia (SVT) is a very fast heartbeat that happens from time to time because of a problem with your heart's

Systemic juvenile idiopathic arthritis (JIA) is a type of JIA in which a child experiences a very high fever and in some cases a