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 healthcare providers 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.

Children with congenital heart disease often grow and develop more slowly than other children. Here's what you should know.

A detailed look at the way children may feel about having congenital heart disease--and tips for helping them cope.

Aortic stenosis means that your child has a heart valve that is too narrow or is blocked.  The aortic valve is 1 of 4 heart valves that keep blood flowing through the heart. The valves make sure blood flows in only one direction. The aortic valve keeps blood flowing from the left ventricle to the aorta.

Warts on the skin are harmless growths. They are caused by a virus. Warts can spread to other parts of the body and to other people.