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A space filled with fluid occurring below or next to a testicle in the male scrotum. It is usually painless, and is not to be confused with a hernia, but may occur along with one.


The lack of absorption, blockage of flow, or overproduction of the cerebrospinal fluid that is found inside of the ventricles (fluid-filled areas) inside of the brain.


Usually used to mean elevated blood pressure, caused by resistance to blood flow in the body. May result from certain types of medication, anxiety, or kidney problems.


Too much thyroid hormone, pushing the body’s metabolism to unhealthy levels.

Hypertrophic Pyloric Stenosis

A narrowing of the lower portion of the stomach that leads into the small intestine, resulting in food not moving easily into the intestine for digestion.


When a child's pituitary gland has lost its ability to make one, some or all pituitary hormones. The condition is often permanent, but very treatable.

Hypoplastic Left Heart Syndrome

When the left side of the heart — including the aorta, aortic valve, left ventricle and mitral valve — is underdeveloped.

Hypoplastic Right Heart Syndrome

A congenital heart defect in which the parts of the right side of the heart — the valves, right ventricle, and pulmonary artery — do not develop fully during pregnancy.


A condition in which the end of the urethra (the tube in the penis through which urine passes out of the body) is not located at the tip of the penis.


When the thyroid gland is underactive and fails to make enough thyroid hormone. Hypothyroidism is common in children and adolescents and is very treatable.

Hypoxic Ischemic Encephalopathy

Death or long-term disability possibly caused by lack of blood flow or oxygen before, during or after birth, from a ruptured uterus, bleeding from the placenta, or cord accidents.

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