GERD, or gastroesophageal reflux disease, is a long-term (chronic) digestive disorder. It happens when stomach contents flow back up (reflux) into the food pipe (esophagus).

Detailed information on male growth and development

Lying and stealing are common, but inappropriate, behaviors in school-aged children. Most of the time these behaviors will be outgrown. Here's what you should know.

Bacterial endocarditis is an infection of the lining of the heart (endocardium), and the heart valves. It does not happen very often, but when it does, it can cause serious heart damage.

In an uncircumcised boy, the foreskin will begin to separate from the tip of the penis. This happens naturally while the boy is a baby. This is called foreskin retraction.

An atrioventricular (AV) canal defect is a congenital heart defect. This means that your child is born with it. These defects may range from partial to complete. These conditions cause oxygen-rich (red) blood and oxygen-poor (blue) blood to mix. This sends extra blood to the child's lungs.

Infectious mononucleosis is a contagious illness. It’s common in teens and young adults.

Coarctation of the aorta is a heart defect that's present at birth (congenital). It means the aorta is narrower than it should be. Read on to learn details about the condition.

Detailed information on adolescents and eating disorders, including anorexia, bulimia, and obesity

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.