Although it is not a perfect measure, BMI gives a fairly accurate evaluation of how much of your child or teen's body is made up of fat.

Detailed information on special considerations for teens with diabetes.

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. Its refers to inflammation.

Detailed information on pediatric arthritis and other rheumatic diseases

IgA Vasculitis is a condition that involves swelling (inflammation) of small blood vessels. The swollen blood vessels leak into the skin, joints, intestines, and kidneys.

Fibromyalgia is a condition that causes pain in muscles and soft tissues all over the body. It is an ongoing (chronic) condition. Learn more about this condition, including what causes it, what the symptoms are, how it's diagnosed and treated, and what you can do to support your child who has it.

The cholesterol in blood comes from 2 sources: the foods your teen eats and their liver. The liver, however, makes all of the cholesterol your teen's body needs.

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

Arthritis is an inflammation of the joints that causes pain and swelling. Juvenile arthritis is the term used for arthritis in children. Read on to learn more.

Some breast changes or conditions are related to a young woman's menstrual cycle, but others may occur at any time. Most breast conditions are benign. Read more about breast changes in young women.