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Diseases & Conditions

Heel pain

Learn about possible causes of this common symptom and what to do about it.

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Helicobacter pylori (H. pylori) infection

Learn more about the symptoms, tests and treatments for this infection.

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Helping baby sleep through the night

Help your baby sleep through the night.

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Hemangioma

This red mark on a baby’s skin looks like a rubbery bump or flat red…

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Hematocrit test

Learn about this red blood cell blood test, including why it’s used and what to…

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Hemifacial spasm

Learn about diagnosis and treatment of this nervous system condition that causes muscles to twitch…

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Hemochromatosis

This liver disorder causes your body to absorb too much iron from the foods you…

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Hemodialysis

Learn about hemodialysis and the risks and benefits of this procedure to treat kidney failure.

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Hemoglobin test

Learn why this blood test is done, how to prepare for it and what the…

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Hemolytic uremic syndrome (HUS)

Damage to the small blood vessels in the kidneys can cause clots that clog the…

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Hemophilia

In this inherited disorder, the blood lacks one of several clot-forming proteins. The result is…

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Hemorrhoids

There are many effective options for easing the discomfort of these swollen veins in the…

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Hemorrhoids during pregnancy: What’s the best treatment?

Know how to relieve painful, swollen veins in the anus and rectum during pregnancy.

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Henoch-Schonlein purpura

Learn about the symptoms, causes and treatment of this illness, also called IgA vasculitis, that…

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Hepatic artery infusion pump (HAIP) chemotherapy

Learn about this specialized chemotherapy treatment that targets cancer in the liver.

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Hepatic encephalopathy

This serious liver condition can harm your brain and lead to coma or death. Find…

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Hepatitis A

This contagious liver infection is caused by a virus. Learn more about its symptoms, treatment…

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Hepatitis B

This serious liver infection is caused by a virus that spreads easily. Learn about the…

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Hepatitis B and Hepatitis C: What’s the difference?

HBV and HCV are viruses that cause liver disease. The symptoms may be the same.…

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Hepatitis C

Many people with this infection don’t know they have it. Find out about symptoms and…

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Hepatitis C antibody test

An HCV antibody test shows whether you’ve ever come into contact with the virus that…

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Hepatitis C: How common is sexual transmission?

Although hepatitis C is highly contagious, the risk of sexual transmission is very low.

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Hepatitis C: What happens in end-stage liver disease?

End-stage complications of hepatitis C include liver failure and liver cancer.

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Hepatocellular carcinoma (HCC)

Learn about the symptoms, diagnosis and treatment for this type of liver cancer.

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Hepatopulmonary syndrome

This lung condition causes low oxygen levels and shortness of breath in people who have…

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HER2-positive breast cancer: What is it?

HER2-positive breast cancer tends to be more aggressive than other types of breast cancer. Treatments…

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Herbal supplements and heart medicines may not mix

Some herbal supplements can have dangerous interactions with heart medications.

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Herbal treatment for anxiety: Is it effective?

Herbal treatment for anxiety: A Mayo Clinic expert discusses safety and effectiveness.

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Herd immunity and COVID-19: What you need to know

Get the facts about coronavirus and herd immunity.

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Hereditary hemorrhagic telangiectasia

This inherited blood vessel condition can cause bad nosebleeds, strokes, bleeding in the digestive tract…

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