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The three most common sites of swollen lymph nodes are the neck, armpit, and groin.

The tonsils and adenoids are made of lymph tissue in the throat. They help make substances (antibodies) that help the body fight

Discusses hyperthyroidism and what happens to the body's metabolism if the thyroid gland is overactive. Explains how Graves'

An intrauterine transfusion provides blood to an Rh-positive fetus when fetal red blood cells are being destroyed by your Rh

Discusses HIV, a virus that attacks white blood cells called CD4+ cells which are an important part of the immune system. Covers

Many children with ADHD can benefit from behavior therapy to help them learn skills for interacting well with others. Parent

Discusses autism, an autism spectrum disorder (once known as a pervasive developmental disorder). Looks at signs of autism

What is amblyopia? Amblyopia is a childhood problem that happens when one eye is weaker than the other. The brain chooses to take

Discusses folate deficiency anemia. Discusses role that folate plays in making red blood cells. Covers symptoms and complications

The shape of the front part of the eye is maintained by a fluid called aqueous humor. Aqueous humor is made by the ciliary body