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Heart arrhythmia
Learn about common heart rhythm disorders that can cause your heart to beat too fast, too slow or irregularly.
Heavy menstrual bleeding
Learn about the causes and treatment of heavy menstrual periods.
Hemochromatosis
This liver disorder causes your body to absorb too much iron from the foods you eat. Learn about symptoms, causes and treatment for this condition that usually runs in families.
Hepatitis A
This contagious liver infection is caused by a virus. Learn more about its symptoms, treatment and prevention, including the hepatitis A vaccine.
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.
Hydrocele
Find out more about the symptoms, causes and treatments for this swelling in the scrotum.
Hydrocephalus
Learn about this potentially fatal condition that causes fluid buildup in the brain. It can cause a range of symptoms, from headaches to poor balance.
Hypoglycemia
Low blood sugar can cause uncomfortable symptoms, such as dizziness and confusion, and can quickly become serious if left untreated.
Hypospadias
Hypospadias is a birth defect in which the opening of the urethra is located on the underside of the penis instead of the tip. Learn about treatment.
Influenza (flu)
Learn more about the symptoms, causes and prevention of this potentially fatal viral infection that attacks the respiratory system.
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