Rheumatic heart disease is a condition that causes permanent damage to the heart valves.

Asthma is a long-term (chronic) lung disease that causes your child's airways to become sensitive to certain things (triggers).

Pulmonary stenosis is a birth defect of the heart (congenital). It can happen when the pulmonary valve doesn’t develop as it should during the first 8 weeks of pregnancy. The pulmonary valve connects the right ventricle to the pulmonary artery.

Patent ductus arteriosus (PDA) is a heart defect found in the days or weeks after birth. Read on to learn about symptoms, diagnosis, and treatment options.

Sprains and strains are types of injuries. A sprain is an injury to a ligament while a strain is an injury to a muscle or tendon.

Marfan syndrome is a genetic  disorder that affects the body's connective tissue. Connective tissue holds the body's cells, organs, and other tissue together. Connective tissue is also important in growth and development.

Ninety percent of new smokers are children and teenagers. In many cases, they are replacing the smokers who quit or died prematurely from a smoking-related disease.

Kawasaki disease is a rare illness that most often affects children. Learn more about this condition, including symptoms, diagnosis, treatment, and complications.

The only safe sex is no sex, most doctors say. But certain precautions and safe behaviors can reduce a person's risk of contracting a sexually transmitted infection.

A phobia is an excessive fear of a certain object or situation. It's a fear that lasts for at least 6 months. It is a type of anxiety disorder. Here's what you need to know.