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Learning Center
Gilbert syndrome
This inherited liver condition affects the liver's ability to break down red blood cells. It usually has no serious medical consequences.
Heart murmurs
An irregular heart sound may be harmless or worrisome. Know the causes of heart murmurs and when treatment is needed.
Heartburn
Occasional heartburn is a common, manageable condition — but when is it a problem?
Heat rash
Learn more about the symptoms, causes and treatment of this heat-related problem of the skin that affects people of all ages.
Hip fracture
The risk of breaking a hip increases with age. Learn about lifestyle changes that can keep bones strong and reduce risk of breaking.
Histoplasmosis
Learn more about the symptoms and treatment of this sometimes life-threatening fungal disease caused by spores in bird and bat droppings.
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.
Hurthle cell cancer
Learn about this rare type of aggressive thyroid cancer. Treatment typically involves surgical removal of the thyroid gland.
Hyperglycemia in diabetes
Hyperglycemia in diabetes can occur for many reasons. Know the causes, symptoms and treatments of high blood sugar and when to get emergency help.
Lactose intolerance
Not being able to fully digest the sugar (lactose) in milk can lead to diarrhea, gas and bloating after eating or drinking dairy products.
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