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...


The nose opens into the two passages of the nasal cavity. The nasal cavity helps warm and moisten incoming air, along with sinuses called paranasal because they surround the nose...


Polyps are abnormal growths of tissue that occur in multiple organs throughout the body. Most nasal polyps are benign growths arising from the mucus membranes of the nose and sinuses, which may be associated with allergy, cystic fibrosis, aspirin sensitivity, allergic fungal sinusitis, asthma and several syndromes involving the respiratory tract...


Nasopharyngeal cancer develops in the nasopharynx, a box-shaped chamber that sits at the top of the throat, behind the nasal passages and above the soft part of the mouth’s roof...


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...


Neck pain can result from a number of injuries, disorders, and diseases in your neck. Arthritis, degenerative disc disease, neck strain, whiplash, a herniated disc and a pinched nerve are some of the many conditions that can result in neck pain and problems...


Necrotizing infections of the skin are severe forms of cellulitis that are characterized by death of infected tissue (necrosis). Necrotizing skin infections that spread on the outer layers of the skin are called necrotizing cellulitis...


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 stabbing, burning or severe type of pain that is caused by a damaged nerve. Although neuralgia can happen anywhere in the body, it most commonly affects the face and neck...


Neurodegenerative diseases increasingly impact numerous bodily functions over time such as balance, movement, speech, respiration, and the cardiac system...


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...


It can be unsettling when you experience symptoms such as numbness, pain, burning, tingling, muscle weakness or sensitivity to touch that indicate the possibility of a nerve or muscle disorder...


Neuropathy can occur when nerves in your peripheral nervous system (the part of your nervous system outside of the brain and spinal cord) are damaged. The condition is also referred to as peripheral neuropathy...


Non-Hodgkin lymphoma is a malignancy of immune system cells and occurs when the lymphatic system produces abnormal, malignant lymphocytes. Lymphocytes are made up of B and T cells that produce antibodies and directly kill tumor cells and microbes...


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...