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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

The systolic part of the heart (cardiac) cycle is when the heart muscle contracts and the heart chambers pump blood out to the

Systolic pressure is the pressure of blood against the artery walls when the heart has just finished contracting or pumping out

Syphilis is a sexually transmitted infection (STI). It's usually spread through sexual contact. But it can also spread to the

A superficial venous thrombosis is a blood clot in a vein that is close to the surface of the skin. A superficial thrombosis

Sudden infant death syndrome (SIDS) is the death of a baby who is younger than 1 year old without a known cause. Typically, a