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Diseases & Conditions

How to track saturated fat

Knowing how much saturated fat is in the foods you eat can help you meet…

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How to treat a piercing infection

Find tips for treating minor ear piercing infections.

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How to treat baby eczema

Learn simple remedies to easing your baby's discomfort from the pain and irritation of this…

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How to trim thickened toenails

Thickened toenails can be uncomfortable, especially if they grow too long. Learn how best to…

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How well do face masks protect against COVID-19?

Face masks can help slow the spread of coronavirus disease 2019 (COVID-19). Learn about mask…

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How you hear

The ears take in and interpret sounds from the outside world.

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How your brain works

Which part of your brain does what? Take a tour.

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HPV infection

This common viral infection often gets better on its own. When it doesn't, it can…

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HPV infection: A cause of cancer in men?

Learn what types of cancer human papillomavirus can cause and how you can lower your…

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HPV test

This test can help show the risk of cervical cancer. Learn more about how to…

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HPV vaccine: Who needs it, how it works

Learn about how the HPV vaccine works, who needs it and what side effects to…

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Human bites: First aid

Whether they're accidental or on purpose, human bites can be as dangerous as or even…

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Human growth hormone (HGH): Does it slow aging?

Is this treatment an anti-aging breakthrough? Know the facts.

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Human metapneumovirus (HMPV): Symptoms and prevention

Human metapneumovirus (HMPV) is a seasonal virus that causes respiratory illness worldwide. Explore symptoms and…

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Humidifiers: Ease skin, breathing symptoms

Find out about different types of these devices. Learn what they can do for you…

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Huntington's disease

This rare disease causes an early decay of nerve cells in the brain. Learn about…

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Hurthle cell cancer

Learn about this rare type of aggressive thyroid cancer. Treatment typically involves surgical removal of…

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Hydrocele

Find out more about the symptoms, causes and treatments for this swelling in the scrotum.

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Hydrocephalus

Learn about this potentially fatal condition that causes fluid buildup in the brain. It can…

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Hydronephrosis

This condition involves swelling of one or both kidneys. Learn the causes, symptoms and treatments.

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Oxygénothérapie hyperbare

This type of therapy is a well-known treatment for decompression sickness, but it has other…

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Hypercalcemia

This condition can weaken bones, create kidney stones, and affect how well the heart and…

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Hypereosinophilic syndrome

Hypereosinophilic syndrome (HES) is a disorder of certain white blood cells that can cause life-threatening…

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Hyperglycemia in diabetes

Hyperglycemia in diabetes can occur for many reasons. Know the causes, symptoms and treatments of…

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Hyperhidrosis

Learn more about causes, symptoms, treatment and self-care tips for this condition that causes heavy…

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Hyperinflated lungs: What does it mean?

If you can’t breathe out well, as in COPD, air may get trapped inside your…

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Hyperinsulinemia: Is it diabetes?

Hyperinsulinemia often is associated with type 2 diabetes.

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Hyperoxaluria and oxalosis

Learn about symptoms, causes, diagnosis and treatment for these rare kidney problems.

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Hyperparathyroidism

Learn about symptoms, tests and treatment for this condition caused by overactivity of the parathyroid…

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Hypertensive crisis: What are the symptoms?

A sudden rise in blood pressure over 180/120 mm Hg is considered a medical emergency,…

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