Nickel allergy is an immune system reaction to nickel. This metal is often in jewelry, clothing fasteners, electronics and many other common items.
Disease
Nicotine dependence
Learn about the chemical in tobacco that makes it hard to stop smoking. Then find out about treatments and resources to help you quit.
Disease
Niemann-Pick disease
A condition passed down in families that affects how the body breaks down and uses fats. Fat buildup in cells damages the nerves, brain and other organs.
Disease
Nightmare disorder
Nightmare disorder involves disturbing or scary dreams that awaken you, causing distress or preventing adequate sleep.
Disease
Non-Hodgkin lymphoma
Learn about the symptoms, risk factors and treatment of this cancer of the lymphatic system that causes swollen lymph nodes.
Disease
Nonallergic rhinitis
Many things can trigger this problem. Learn how to get relief from your runny, stuffy nose.
Disease
Nonmelanoma skin cancer
Learn about treatment options for all types of nonmelanoma skin cancer, including squamous cell carcinoma, basal cell carcinoma and others.
Disease
Noonan syndrome
This genetic condition stops typical development in parts of the body. It may include unusual facial features, short height, heart problems or other issues.
Disease
Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and diarrhea. Learn ways to protect yourself.
Disease
Optic neuritis
Learn about this painful eye disorder that affects your optic nerve and what your doctor may recommend for treatment.
Disease
Pancreatic neuroendocrine tumors
Learn about these cancers that start in the hormone-producing cells of the pancreas. Explore innovative treatments, including the Whipple procedure and PRRT.
Disease
Paraneoplastic syndromes of the nervous system
This group of conditions affects people who have cancer and occurs when parts of the immune system attack parts of the nervous system.