During puberty, a teen boy will grow taller and heavier, and hormones will lead to sexual maturity. Read on to learn what to expect.

Girls experience puberty as a sequence of events, and their pubertal changes usually begin before boys of the same age. The first pubertal change in girls usually is breast development.

Obsessive-compulsive disorder (OCD) is a type of anxiety disorder. A child with OCD has obsessive thoughts that are not wanted. The thoughts are linked to fears, such as touching dirty objects.

Obesity is when a teen has too much body fat. Obesity is a serious, long-term disease.

A child's growth not only involves the length and weight of his or her body, but also internal growth and development.

Herpangina is a very common illness in children. It causes small blisterlike bumps or sores (ulcers) in the mouth.

Bone marrow suppression is when fewer blood cells are made in the marrow. It's a common side effect of some strong medicines, such as chemotherapy.

Most pituitary tumors are not cancer (benign). But they can cause the pituitary to make too few or too many hormones, causing problems in the body. Here's what you should know.

This sheet discusses the effects of ultraviolet light and the increased risk of skin cancer, including the use of sunscreen as one skin cancer prevention method.

Skin cancer can be treated with more success if it's found early. Read on for detailed information on doing your own skin self-exam.