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A stye is an infection in the tiny oil glands that surround the base of each eyelash along the edge of the eyelid. A stye begins

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

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

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

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

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

Symptoms of a heart attack may include: Chest pain or pressure, or a strange feeling in the chest. Sweating. Shortness of breath

Sexually transmitted infections (STIs) can cause many different symptoms. They may include: Abnormal discharge from the vagina

What is sepsis? Sepsis is a serious reaction to an infection. It causes inflammation across large areas of the body and can damage