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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

Stomach (gastric) juice is the term used to describe the chemicals that break down food in the stomach. These include hydrochloric

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

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

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