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Jacksonian Seizures

A Jacksonian seizure is a type of focal partial seizure, also known as a simple partial seizure. This means the seizure is caused by unusual electrical activity that affects only a small area of the brain. The person maintains awareness ...


Jaundice occurs when the reddish-yellow color in the blood and liver, bilirubin, builds up to abnormally high levels in the blood. The skin, whites of the eye and other bodily fluids take on a yellow color.

Joint Aspiration

Joint aspiration is a procedure to remove fluid from the space around a joint using a needle and syringe. It may be done to relieve swelling and/or to obtain fluid for analysis to diagnose a joint disorder and/or problem.

Juvenile Ankylosing Spondylitis (JAS) in Children

Juvenile ankylosing spondylitis is a type of arthritis. It affects the spine and the places where the muscles, tendons, and ligaments are attached to bone. Ankylosing means stiff or rigid. Spondyl means spine. Itis refers to inflammation.

Juvenile Arthritis

Juvenile arthritis is the chronic inflammation of one or more joints that develops in a person younger than 16. About 285,000 children in the United States have juvenile arthritis. Children with juvenile arthritis may be frequently ...

Juvenile Arthritis and Other Rheumatic Diseases

Arthritis is an inflammation of the joints that causes pain and swelling. Juvenile arthritis is the term used for arthritis in children. Arthritis is one category of rheumatic diseases. Rheumatic diseases can cause pain, stiffness, and ...

Juvenile Dermatomyositis

Juvenile dermatomyositis (JDM) is a rare disease that causes muscle inflammation and a skin rash.

Juvenile Idiopathic Arthritis

Juvenile idiopathic arthritis (JIA) is a form of arthritis in children. Arthritis causes joint swelling (inflammation) and joint stiffness. JIA is arthritis that affects 1 or more joints for at least 6 weeks in a child age 16 or younger.

Juvenile Myoclonic Epilepsy

Juvenile Myoclonic Epilepsy is one of many different types of epilepsy. Its most common symptom is repeated seizures, known as myoclonic seizures. These cause quick jerking movements. It's also sometimes called Janz syndrome or Epilepsy ...

Juvenile Osteoporosis

Osteoporosis is a condition where the bones are thinner than normal. It’s a condition that gets worse over time. This means that bones get thinner over time, or don’t grow as they should. The bones are then weaker and at higher risk of ...

Juvenile Rheumatoid Arthritis

The first signs of juvenile rheumatoid arthritis can sometimes be mistaken for the ordinary illnesses and injuries of childhood. In other children the signs may be quite obviously those of arthritis.

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