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Niemann-Pick disease

A condition passed down in families that affects how the body breaks down and uses…

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Night leg cramps

Find out about this common nighttime pain in the calf, foot or thigh and how…

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Night sweats

Learn what conditions and medications might cause these sleep-disturbing sweats.

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Nightmare disorder

Nightmare disorder involves disturbing or scary dreams that awaken you, causing distress or preventing adequate…

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Nighttime headaches: How can I get relief?

"Alarm clock" (hypnic) headaches wake people up. But other nighttime headaches also can disrupt sleep.…

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Nighttime panic attacks: What causes them?

Nighttime panic attacks can cause sweating, rapid heart rate, trembling, shortness of breath, heavy breathing,…

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Nipple discharge

Fluid leaking from the nipples isn't often a sign of breast cancer. Learn more about…

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No appetite? How to get nutrition during cancer treatment

Tips for getting the calories and nutrients you need during cancer treatment.

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Non-Hodgkin lymphoma

Learn about the symptoms, risk factors and treatment of this cancer of the lymphatic system…

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Fatty liver disease (MASLD)

This liver condition is becoming more common in the Western world. Find out how to…

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Nonallergic rhinitis

Many things can trigger this problem. Learn how to get relief from your runny, stuffy…

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Nondirected living-donor transplant

Nondirected living donor — Find out what becoming a good Samaritan, also called nondirected, living…

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Nonmelanoma skin cancer

Learn about treatment options for all types of nonmelanoma skin cancer, including squamous cell carcinoma,…

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Nonprescription acne treatment: Which products work best?

Find out how acne treatments you can buy at the store differ, what main ingredients…

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Nonprescription laxatives for constipation: Use with caution

Looking for a laxative to relieve constipation? Learn how different nonprescription medicines work and be…

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Noonan syndrome

This genetic condition stops typical development in parts of the body. It may include unusual…

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Norovirus infection

This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and…

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Nosebleeds

Learn about possible causes of a nosebleed, self-care steps to take if you get one…

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Nosebleeds: First aid

How to give first aid for nosebleeds.

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NSAIDs: Do they increase my risk of heart attack and stroke?

Common pain medicines such as ibuprofen or naproxen sodium may increase the risk of heart…

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Nuclear stress test

This type of stress test uses a tiny bit of radioactive material to look for…

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Numbness

Trauma, nervous system conditions and chronic diseases are some of the possible causes of this…

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Numbness in hands

Infections, chronic health conditions and nervous system conditions are possible causes of this loss of…

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Nutrition for kids: Guidelines for a healthy diet

See the current children's nutrition recommendations for protein, carbohydrates, more.

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Nuts and your heart: Eating nuts for heart health

Discover how walnuts, almonds and other nuts can improve heart health.

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Obésité

You might think of obesity as a cosmetic concern. But it is a medical condition…

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Obsessive-compulsive disorder (OCD)

OCD features unwanted thoughts and fears, or obsessions. These obsessions lead to repetitive behaviors, also…

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Obstructive sleep apnea

Learn the signs that point to this common and potentially serious sleep disorder. And find…

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Occipital nerve stimulation: Effective migraine treatment?

Occipital nerve stimulation is a relatively new procedure to treat chronic headache disorders.

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Occupational asthma

Dust, fumes and other substances at work can cause asthma. Find out how to recognize…

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