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Mood Disorders in Teens What are mood disorders in teens? Mood disorders are a group of mental health problems. They are sometimes called affective disorders. These are the most common types: Major depression. A teen with this type has a depressed or irritable mood, along with

Allergy Overview What are allergies? Allergies are due to a problem with the body's immune system. Most allergic reactions happen when the immune system reacts to a false alarm. Normally the immune system attacks harmful things, such as viruses or bacteria. But sometimes it

HIV/AIDS What is HIV/AIDS? The term AIDS refers to the most advanced stages of an infection caused by the human immunodeficiency virus (HIV). The current definition of AIDS includes: All HIV-infected people who have fewer than 200 CD4+ T cells (also called T4 cells or just T

Lymphadenopathy in Children What is lymphadenopathy in children? Lymphadenopathy means swelling of the lymph nodes or glands. These are the bean-shaped glands in the neck, armpits, groin, chest, and abdomen. These glands act as filters for lymphatic fluid. This fluid contains

Heart Failure in Children What is heart failure in children? The heart is a muscle that pumps oxygen-rich blood to all parts of the body. When you have heart failure, the heart is not able to pump as well as it should. Blood and fluid may back up into the lungs (congestive heart

Polycystic Ovary Syndrome (PCOS) What is polycystic ovary syndrome (PCOS)? Polycystic ovary syndrome (PCOS) is a set of symptoms caused by a problem with a woman’s hormones. It affects the ovaries. These are the small organs that store a woman’s eggs. But it can also affect the

Bicycling, Inline Skating, Skateboarding, and Scooter Safety—Prevention Buying the right bike It's important that the bike your child rides is the right size. In addition, consider the following advice: The bike shouldn't be too big or complicated. Your child should be able to

Warts What are warts? Warts are common skin growths. They can spread to other parts of the body and to other people. Most warts go away over a long time with no treatment. There are many kinds of warts. The most common kinds are: Common warts. These grow on the fingers, elbows

Ewing Sarcoma in Children What is Ewing sarcoma in children? Ewing sarcoma is a rare type of cancer. It can affect a person of any age, but it's most common between ages 10 and 20. It often grows in bone, but it can also grow in soft tissue that's connected to the bone. This may

Osteosarcoma (Osteogenic Sarcoma) in Children What is osteosarcoma in children? Osteosarcoma is very rare, but it's the most common kind of bone cancer in children and teens. It's most common in teens and young adults. Osteosarcoma is cancer that starts in the bone. The cancer