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The small intestine is a winding, tightly folded tube about 20 ft (6.1 m) long in adults. It is connected to the stomach on the

Smoke inhalation occurs when a person breathes in hot air, smoke, or chemical fumes, which can cause burns or swelling in the air

Babies normally are born with two soft spots (fontanelles) on their head: a large soft spot on the top and a small one on the back

South African tick-bite fever is a disease passed to humans by ticks that are infected with an organism called Rickettsia africae

Spasticity is a condition in which muscles are tight or stiff. At times the muscles may jerk or spasm uncontrollably. It can

Spinal anesthesia is the injection of medicine near the spinal cord and the nerves around it in the lower back. It is used to numb

Squamous cell skin cancer (also called squamous cell carcinoma of the skin) is a common type of skin cancer. When found and

Spontaneous nipple discharge is when fluid comes out of the nipple on its own. This means a person has not squeezed or pressed on

A sprain is an injury to the tough ropey fibers (ligaments) that connect bone to bone. Symptoms of a sprain may be mild or severe

The spleen is an organ in the upper left side of the abdomen that filters the blood by removing old or damaged blood cells and