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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 stomach infection, sometimes called gastroenteritis, can be caused by a viral, bacterial, or parasitic infection. It is

A subdural hematoma is an increase in pressure within the skull that happens when blood collects in the space between the skull

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

Sudden heart failure causes rapid fluid buildup, or congestion, in the lungs and other parts of the body. It occurs when the heart

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