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The partition between the nasal cavities is called the nasal septum. It's made up of cartilage and bone. If the septum is crooked

Diphtheria is a contagious illness caused by a type of bacteria. It can cause breathing and swallowing problems and can damage the

The diopter is a unit of measurement used to describe how well a person sees. Farsightedness is measured in positive diopters, and

A digital (finger) rectal examination checks for abnormalities of organs or other structures in the pelvis and lower abdomen

Diethylstilbestrol (DES) is a medicine that was prescribed in the United States until 1971 to prevent miscarriage or premature

Down syndrome is a genetic condition caused by abnormal cell division in the egg, sperm, or fertilized egg. This results in an

A Doppler ultrasound (or duplex scanning) is a medical test that uses reflected sound waves to estimate the speed and direction of

Dizziness, or lightheadedness, is a feeling of unsteadiness. Dizziness can lead to feeling faint or to fainting (brief loss of

Duchenne muscular dystrophy is a rare disease that causes muscles to grow weaker, beginning with the leg muscles. The disease is

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