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Spirometry is a test that measures the amount of air a person's lungs can move in and out and at what rate. To be tested: The

Spider veins are small blood vessels that can be seen through the skin. Spider veins do not usually cause symptoms, although some

Spinal discs are located between each of the 33 vertebrae, which are the interlocking bones of the spine that are stacked on top

A stroke is damage to the brain that happens when a blood vessel in the brain is blocked or bursts. Without blood and the oxygen

Strep throat is an infection in the throat and the tonsils caused by strep bacteria. It causes a severe sore throat and may cause

Strawberry tongue is a red discoloration of the tongue that may be caused by certain illnesses, such as scarlet fever. A bright

Illegal drugs are those that are not prescribed by a doctor or bought at a drugstore. They are sometimes called "street drugs."

Staghorn calculi (struvite stones) are a type of kidney stone that may occur with frequent kidney infections. They can be more

A stent is a small, expandable tube that can be inserted into a blood vessel and expanded using a small balloon during a procedure

Strabismus is a vision problem in which both eyes do not look at the same point at the same time. It usually develops during