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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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Herniated disk

This condition occurs most often in the lower back. In many cases, it causes no…

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Hernia hiatal

A hiatal hernia occurs when part of the stomach bulges into the chest. It can…

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Hipo

Caused by spasms of your diaphragm that you can't control, hiccups are usually harmless. Rarely,…

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HIDA scan

Find out what to expect during a HIDA scan — a nuclear imaging procedure used…

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Hidradenitis suppurativa

This condition causes small, painful lumps to form where your skin rubs together. The lumps…

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High blood pressure and cold remedies: Which are safe?

Among cold medicines, decongestants cause the most concern for people who have high blood pressure.

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High blood pressure and pregnancy: Know the facts

Concerned about high blood pressure during pregnancy? Find out what you can do to reduce…

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High blood pressure and sex: Overcome the challenges

High blood pressure may affect your sex life. Talking openly about your concerns with a…

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High blood pressure dangers: Hypertension's effects on your body

If blood pressure stays high, it can cause other health conditions. Find out more about…

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High blood pressure (hypertension)

Learn the symptoms and treatment of this condition — which raises the risk of heart…

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High blood pressure in children

Children can develop high blood pressure for the same reasons adults do — excess weight,…

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High blood protein

What does it mean if you have high blood proteins? Learn about the role proteins…

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Colesterol alto

The body needs some cholesterol to build healthy cells. But high cholesterol can raise the…

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High cholesterol in children: How is it treated?

High cholesterol in children can lead to narrowed and hardened arteries, increasing the risk of…

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High cholesterol treatment: Does cinnamon lower cholesterol?

Can cinnamon lower cholesterol?

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High-dose flu vaccines: How are they different from other flu vaccines?

Some vaccines are recommended for people who have a weaker immune response to the standard…

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High-dose vitamin C: Can it kill cancer cells?

High-dose vitamin C has been touted by some as an effective alternative cancer treatment.

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High hemoglobin count

A high level of hemoglobin in the blood usually occurs when the body needs more…

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High potassium (hyperkalemia)

What does it mean to have high potassium? Learn about the role potassium plays in…

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High-protein diets: Are they safe?

Considering a high-protein diet for weight loss? Understand the precautions first.

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High red blood cell count

Learn the possible causes of too many oxygen-transporting cells.

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High-risk pregnancy: Know what to expect

Find out what to expect during a high-risk pregnancy and learn steps you can take…

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High uric acid level

Find out possible causes of having too much uric acid in the blood.

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High white blood cell count

Learn the causes of this increase in disease-fighting cells in the blood.

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Hilar cholangiocarcinoma

Learn about how this type of bile duct cancer is diagnosed and treated.

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Hip dysplasia

In infancy, this condition often can be corrected with a soft brace. Older children and…

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Hip fracture

The risk of breaking a hip increases with age. Learn about lifestyle changes that can…

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Hip labral tear

Sports such as soccer, football and golf can increase your risk of damaging the ring…

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