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Hyperparathyroidism is when the parathyroid glands make too much parathyroid hormone. The condition is rare in children.

SIADH is when the body makes too much antidiuretic hormone (ADH). This is a hormone that normally helps the kidneys conserve the correct amount of water in the body. SIADH causes the body to retain water. This lowers the level of sodium in the blood. SIADH is rare. It most often happens to children who are in the hospital.

You can prevent the flu this season by taking one simple step: Get a flu shot.

Detailed information on translocation Down syndrome

Genetic testing can help find diseases that run in a family or don't yet have symptoms.

Detailed information on x-linked dominant inheritance.

This test measures the amount of a substance in your body that helps new blood vessels form. The test can help keep track of cancer treatment.

The flu is an infection that affects your respiratory tract. This tract includes your mouth, nose, and lungs, and the passages between them. Unlike a cold, the flu can make you very ill.

A low-fiber diet means eating foods that don't have much fiber. They are easy to digest. Learn why your doctor may put you on this kind of diet-and what foods you can and can't eat.