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Diseases & Conditions

Hand swelling during exercise: A concern?

This condition is a common problem, but rarely serious enough to disrupt your routine.

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Hand transplant

Find out what's involved in this surgery in which someone with an amputation receives one…

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Hand-washing: Do's and don'ts

Done right, hand-washing is a simple way to prevent the spread of germs and keep…

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Hangovers

Unpleasant symptoms can happen after drinking too much alcohol. But serious symptoms may mean alcohol…

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Hantavirus pulmonary syndrome

Learn about the rodent-transmitted virus that causes severe — and sometimes fatal — lung disease…

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Hashimoto's disease

Learn about the symptoms and treatment of this thyroid disorder caused by an immune-system dysfunction.

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Hay fever

Find out more about how to diagnose and get relief from this common condition that…

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HCG diet: Is it safe and effective?

Learn about the risks of this dangerous diet.

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HDL cholesterol: How to boost your 'good' cholesterol

People who have higher levels of HDL cholesterol often are at lower risk of heart…

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Head and neck cancers

Learn about innovative treatment for throat cancers, mouth cancers, tongue cancers, tonsil cancers and other…

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Head lice

Find out how these tiny insects that feed on blood from the human scalp can…

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Head trauma: First aid

How to administer first aid for head trauma.

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Headache

Headache: Symptom — Overview covers definition, possible causes of this painful symptom.

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Headache: First aid

What to do if you or someone else has head pain.

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Headaches and hormones: What's the connection?

Headaches are part of life for many people. Understand how hormones can play a role.

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Headaches during pregnancy: What's the best treatment?

Here's help with preventing or easing this common type of pain while you're pregnant.

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Headaches in children

Find out more about this condition, which may or may not be serious. Headaches can…

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Headaches: Reduce stress to prevent the pain

Head pain can seem worse when you're under stress — and stress by itself can…

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Headaches: Treatment depends on your diagnosis and symptoms

To combat your headaches, first determine what type of headaches you have.

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Health concerns for transgender people

Understand health issues for transgender and gender-diverse people, and learn how to promote good health.

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Health issues for gay men and other men who have sex with men

Understand health issues for gay men and other men who have sex with men, and…

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Health issues for lesbians and other women who have sex with women

Understand health concerns for lesbians and other women who have sex with women, and take…

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Healthy meals start with planning

It's easy to put healthy meals on the table with a little planning. This guide…

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Healthy sperm: Improving your fertility

Simple steps to help ensure that sperm are healthy, along with tips to improve fertility.

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Hearing aids: How to choose the right one

Find out how to choose the right device to help you hear better.

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Hearing loss

Age- and noise-related hearing loss are common and can affect quality of life. But many…

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Heart arrhythmia

Learn about common heart rhythm disorders that can cause your heart to beat too fast,…

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Heart attack

A blockage of blood flow to the heart can damage or destroy heart muscle.

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Heart attack: First aid

How to recognize, get help for and provide first aid for a heart attack.

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Heart attack prevention: Should I avoid secondhand smoke?

It's possible that secondhand smoke can irritate the arteries and increase the risk of a…

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