Conditions

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Ingrown toenails and fungal nails are the two most common nail disorders. Ingrown Toenails With an ingrown toenail, one or both corners of the nail grow into the soft tissue of the nail groove, causing irritation, pain and redness...


Narcolepsy is a chronic, neurological sleep disorder with no known cause. It involves the body's central nervous system. Narcolepsy is a genetic disorder, and is caused by a deficiency in the production of a neuropeptide (known as hypocretin or orexin) by a part of the brain called the hypothalamus...


If you’re experiencing neck and shoulder pain, you know firsthand how it can impact your day-to-day activities. For some, the pain is limited just to the neck or the shoulder, and others experience pain in both areas...


Nephritis is an inflammation of the kidneys. Sudden inflammation is called acute nephritis, which has several causes and can lead to kidney failure. Long-lasting inflammation is called chronic nephritis.


Nephrotic syndrome is a set of symptoms that results from various disorders that damage the kidney's glomeruli, the filtration units in the kidney's nephrons that rid the bloodstream of fluids and wastes...


Neuralgia is a type of pain caused by a damaged nerve. Neuralgia can be caused by a disease like diabetes or multiple sclerosis and can occur anywhere in the body.


Learn about Neurodegenerative Diseases diagnosis, symptoms, causes and treatments at Northwell Health’s Memory Disorders Center.


There are many types of neuroendocrine tumors that affect many areas of the body. They are most frequently found in the gastrointestinal tract, pancreas, liver and lungs.


Non-Hodgkin lymphoma is a type of cancer that happens when cells in your lymph system grow abnormally and out of control. The cells can form a mass, called a lymphoma. They can also spread to other parts of your body.


Nonalcoholic fatty liver disease is a buildup of extra fat in the liver cells. While it is normal for the liver to contain some fat, levels more than five to 10 percent of the liver’s weight is classified as fatty liver...


Did you know that lower back pain is the single leading cause of disability worldwide? How about that Americans spend more than $50 billion each year on treating back pain? Back pain is frustrating...