Nutrition basics
Learning Center
Hydronephrosis
Learn about this condition that occurs when urine doesn't drain properly from the upper urinary tract, leading to kidney swelling.
Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
Horner syndrome
Find out about Horner syndrome, an interruption in nerve signals from the brain to the eye and face on one side of the body.
Hirschsprung's disease
This digestive disorder that's present at birth affects the nerves in the colon. It causes severe constipation but can be treated.
Hip dysplasia
In infancy, this condition often can be corrected with a soft brace. Older children and young adults might require surgery to correct the misalignment.
Hepatitis B
This highly contagious virus can cause long-lasting problems if it goes untreated. Learn about the symptoms, treatment and prevention of this serious liver infection.
Hepatitis A
This contagious liver infection is caused by a virus. Learn more about its symptoms, treatment and prevention, including the hepatitis A vaccine.
Hemophilia
In this inherited disorder, the blood lacks one of several clot-forming proteins. The result is prolonged bleeding, which can be life-threatening.
Hemangioma
This red mark on a baby's skin looks like a rubbery bump or flat red mark and is made up of extra blood vessels in the skin. It generally goes away by age 10. Learn more about its causes and treatment.
Heat rash
Learn more about the symptoms, causes and treatment of this heat-related problem of the skin that affects people of all ages.
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