Multiple myeloma is a cancer that forms in a type of white blood cell called a plasma cell. Healthy plasma cells help you fight infections by making antibodies that recognize and attack germs.
A disease in which the immune system eats away at the protective covering of nerves.
Multiple system atrophy (MSA) is a rare condition of the nervous system that causes gradual damage to nerve cells in the brain.
In muscular dystrophies, abnormal genes (mutations) lead to muscle degeneration. Most forms begin in childhood.
Nearsightedness (myopia) is a common vision condition in which you can see objects near to you clearly, but objects farther away are blurry.
Nasal congestion or "stuffy nose" occurs when nasal and adjacent tissues and blood vessels become swollen with excess fluid, causing a "stuffy" plugged feeling.
Nasal polyps are soft, noncancerous growths on the lining of your nose or sinuses. They often occur in groups, like grapes on a stem.
Acute nephritis occurs when your kidneys suddenly become inflamed. It has several causes, and it can lead to kidney failure if left untreated.
Nephrotic syndrome is a kidney disorder that causes your body to pass too much protein in your urine.