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Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect). It occurs when part of the heart doesn't develop as it should during the first eight weeks of pregnancy.

Pulmonary atresia (PA) is a heart defect. It happens when the fetal heart doesn’t form as it should during the first 8 weeks of pregnancy.

Tricuspid atresia (TA) is a heart defect present at birth (congenital). It occurs when the tricuspid valve doesn’t form right during fetal heart development. This happens during the first 8 weeks of pregnancy. Read on to learn details about this condition.

Diabetes insipidus is a condition caused by not enough antidiuretic hormone (ADH) in the body. ADH is also known as vasopressin. This is a hormone that helps the kidneys keep the correct amount of water in the body. The condition is also called “water diabetes.”

Addison disease is when the adrenal glands don't make enough of two steroid hormones. The hormones are cortisol and aldosterone. Cortisol controls the body's metabolism, blocks inflammatory reactions, and affects the immune system. Aldosterone manages sodium and potassium levels. Addison disease is fairly rare and may first appear at any age.

Hearing aids can help improve hearing and speech, especially in children with hearing loss in the inner ear caused by damaged hair cells or a damaged hearing nerve. Read on to learn about the types of hearing aids available, and what to think about before buying one.

Here's a look at just a few of the tests used to understand and identify cardiovascular disease.

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.