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Heart Murmurs
A heart murmur is an abnormal noise between heartbeats. It can be a sign of a heart problem.
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Heart Palpitations
Heart palpitations is a condition that feels like your heart is pounding, racing, or skipping beats (fluttering).
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Heartburn
Heartburn is a burning feeling in the lower chest, along with a sour taste in the throat and mouth. It…
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Heat Exhaustion and Heat Stroke
Heat exhaustion and heatstroke are serious conditions. Learn the warning signs of these heat-related illnesses, as well as how to…
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Heat Rash
Heat rash is a skin irritation that stings and makes your skin red. It is also called miliaria or prickly…
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HELLP Syndrome
HELLP Syndrome is a rare but serious pregnancy-related illness, similar to preeclampsia, another pregnancy condition.
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Hemolytic Uremic Syndrome
Hemolytic Uremic Syndrome is a condition that results from a digestive system infection.
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Hemorrhoids
Hemorrhoids are swollen or inflamed veins in your rectum or around your anus. They are very common, especially in people…
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Henoch-Schönlein Purpura
Henoch-Schönlein purpura (HSP) is a rare disease that irritates and inflames the blood vessels in your skin.
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Hepatitis A
Hepatitis A (Hep A) is liver inflammation caused by the hepatitis A virus. It isn’t typically as serious as hepatitis…
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Hepatitis B
Hepatitis B is a serious liver infection caused by a virus. It is usually spread from person to person through…
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Hepatitis C
Hepatitis C is a serious virus that causes inflammation of the liver. It is spread from person to person through…
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Hereditary Hemochromatosis
Hereditary hemochromatosis is a disease in which your body has too much iron. This extra iron can damage your tissues…
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Hernia
A hernia is a tear in your muscle or tissue that allows part of your insides to bulge out. Sometimes…
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Herniated Disc
A herniated disc happens when a disc in your spine weakens or ruptures, putting pressure on a nerve or the…
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Herpes
Herpes is a group of viruses that cause painful blisters and sores. There is no cure, but medicines can treat…
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Hidradenitis Suppurativa
Hidradenitis suppurativa is a chronic skin disease that causes painful red bumps in places where hair grows, including armpits, groin…
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High Blood Pressure
High blood pressure (hypertension) is a medical condition that occurs when your blood moves through your arteries at higher pressure…
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High Blood Pressure During Pregnancy
Some women will experience high blood pressure during their pregnancy. Treatment varies depending on the type you have and how…
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High Cholesterol
High cholesterol is a medical condition that can lead to stroke and heart disease.
All conditions
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