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Jaundice - a yellow discoloration of the skin and whites of the eyes due to abnormally high levels of bilirubin (bile pigmentation) in the bloodstream.

Jejunostomy - a procedure to create an opening in the jejunum (a part of the small intestine) to a hole (stoma) in the abdomen, to allow for giving nutrition directly into the small intestine when the upper digestive tract cannot be used because of illness or injury.

Jejunum - middle section of the small intestine between the duodenum and ileum.

Joint - where the ends of two or more bones meet.

Joint locking - extremely painful condition usually caused by entrapment of a loose body within the joint.

Jordan frame - specialized stretcher developed to transport patients with a suspected spinal injury.

Jugular veins - one of four veins in the neck that carry blood from the head back to the heart.

Jumper's knee (Also called patellar tendonitis.) - a condition characterized by inflammation of the tendons in the front of the knee area that causes local pain and tenderness.

Juvenile rheumatoid arthritis (JRA) - a form of arthritis in children ages 16 or younger that causes inflammation and stiffness of joints for more than six weeks. Unlike adult rheumatoid arthritis, which is chronic and lasts a lifetime, children often outgrow juvenile rheumatoid arthritis. However, the disease can affect bone development in the growing child.