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Adrenal insufficiency is a disorder that occurs when the adrenal glands don't make enough of the hormone cortisol. Learn more about this condition, including the causes, symptoms, diagnosis, treatment, and complications.

Diabetes insipidus occurs when your body doesn’t make enough antidiuretic hormone (ADH). Learn more about this rare disease that causes you to urinate often.

Hearing aids are electronic, battery-operated devices that can make sound louder. A microphone receives the sound and converts it into sound waves. The sound waves are then converted into electrical signals.

Read about the many devices available to help improve communication for people with speech or hearing problems.

An electrocardiogram (ECG) is one of the simplest and fastest tests used to evaluate the heart. For this test, electrodes (small, plastic patches that stick to the skin) are placed at certain spots on the chest, arms, and legs. When the electrodes are connected to an ECG machine by wires, the electrical activity of the heart is measured, interpreted, and printed out.

Mental illness can cause different symptoms in men than in women. So some disorders in men may be harder to recognize. Here's what you need to know.

At least 8 million people in the U.S. are living with an eating disorder. Read on for a helpful overview of the three main types of eating disorders.

Celiac disease is a digestive disorder that damages your small intestine and keeps it from absorbing the nutrients in food. A protein found in wheat, barley, and rye called gluten is what causes the damage to the intestinal tract.

Many people are reducing or eliminating their dietary intake of gluten, a protein found in wheat, rye, barley, and some other grains. But only those who have celiac disease need to completely stop eating gluten.