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Detailed anatomical description of the heart valves, including simple definitions and a labeled, full-color illustration.

Lead poisoning is a totally preventable disease. Children ages 1 to 3 who live in low-income housing built before 1978 are especially at risk. Read on to learn more.

Acne is a disorder of the hair follicles and sebaceous glands. Hair follicles are the areas around the base or root of each hair. Sebaceous glands are the tiny glands that release oil (sebum) into the hair follicles. The sebum moistens the skin and hair. The sebum and hair get to the skin surface through tiny holes called pores.

One of the major fears preschoolers have is fear of the unknown. Tell your child about the surgery several days before the procedure and perhaps even visit the hospital for a tour.

A cancer diagnosis is shocking and overwhelming. Learn some practical things that you can do to cope during this time.

When a child is diagnosed with cancer, parents are entitled to a clear explanation about anything related to the condition. Here are some important questions you may consider asking your child's doctor.

This test measures the concentration, or osmolality, of certain particles in a sample of your watery stool. The test is used to find out why you have chronic diarrhea.

This test looks at a sample of your urine, to help diagnose, find, or track many conditions, such as diabetes or urinary tract infections.

People with heart disease are at increased risk for serious depression. Unfortunately, many of them don't know it.