Niemann-Pick disease
A condition passed down in families that affects how the body breaks down and uses…
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First Aid
Nightmare disorder
Nightmare disorder involves disturbing or scary dreams that awaken you, causing distress or preventing adequate…
繼續閱讀Nighttime headaches: How can I get relief?
"Alarm clock" (hypnic) headaches wake people up. But other nighttime headaches also can disrupt sleep….
繼續閱讀Nighttime panic attacks: What causes them?
Nighttime panic attacks can cause sweating, rapid heart rate, trembling, shortness of breath, heavy breathing,…
繼續閱讀Nipple discharge
Fluid leaking from the nipples isn't often a sign of breast cancer. Learn more about…
繼續閱讀No appetite? How to get nutrition during cancer treatment
Tips for getting the calories and nutrients you need during cancer treatment.
繼續閱讀Non-Hodgkin lymphoma
Learn about the symptoms, risk factors and treatment of this cancer of the lymphatic system…
繼續閱讀Fatty liver disease (MASLD)
This liver condition is becoming more common in the Western world. Find out how to…
繼續閱讀Nonallergic rhinitis
Many things can trigger this problem. Learn how to get relief from your runny, stuffy…
繼續閱讀Nondirected living-donor transplant
Nondirected living donor — Find out what becoming a good Samaritan, also called nondirected, living…
繼續閱讀Nonmelanoma skin cancer
Learn about treatment options for all types of nonmelanoma skin cancer, including squamous cell carcinoma,…
繼續閱讀Nonprescription acne treatment: Which products work best?
Find out how acne treatments you can buy at the store differ, what main ingredients…
繼續閱讀Nonprescription laxatives for constipation: Use with caution
Looking for a laxative to relieve constipation? Learn how different nonprescription medicines work and be…
繼續閱讀Noonan syndrome
This genetic condition stops typical development in parts of the body. It may include unusual…
繼續閱讀Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and…
繼續閱讀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…
繼續閱讀Nuclear stress test
This type of stress test uses a tiny bit of radioactive material to look for…
繼續閱讀Numbness in hands
Infections, chronic health conditions and nervous system conditions are possible causes of this loss of…
繼續閱讀Nutrition for kids: Guidelines for a healthy diet
See the current children's nutrition recommendations for protein, carbohydrates, more.
繼續閱讀Nuts and your heart: Eating nuts for heart health
Discover how walnuts, almonds and other nuts can improve heart health.
繼續閱讀Obsessive-compulsive disorder (OCD)
OCD features unwanted thoughts and fears, or obsessions. These obsessions lead to repetitive behaviors, also…
繼續閱讀Obstructive sleep apnea
Learn the signs that point to this common and potentially serious sleep disorder. And find…
繼續閱讀Occipital nerve stimulation: Effective migraine treatment?
Occipital nerve stimulation is a relatively new procedure to treat chronic headache disorders.
繼續閱讀Occupational asthma
Dust, fumes and other substances at work can cause asthma. Find out how to recognize…
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