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The duodenum, or the first part of the small intestine, connects to the stomach. The duodenum is about 10 in. (25.4 cm) long and

Dupuytren's disease is a thickening and shortening of tissue under the skin in the palm of your hand. It often affects the ring

A medical power of attorney, also called a durable power of attorney for health care, is a legal document. In it, you grant

Dust mites are tiny spiderlike creatures (arachnids) that feed mostly on flakes of dead human skin. Mites do not bite humans or

Dysplasia is the term used for cells that have changed and grown or developed abnormally. Typically it means that the cells are at

Drug resistance (such as antibiotic resistance) occurs when disease-causing organisms change over time and adapt in ways that

Diabetic hypoglycemia (also called insulin shock or insulin reaction) is having an abnormally low amount of sugar (glucose) in the

Dopamine is a brain chemical called a neurotransmitter that carries signals between nerve cells and helps the brain perform

Developmental delays are present when a child does not demonstrate abilities and skills commonly found in other children in the

Briefly discusses common sexually transmitted infections. Offers interactive tool to help decide when to seek care.