This condition isn't always a concern. But sometimes it can cause dizziness and fainting or be life-threatening. Learn when it needs treatment.
Disease
Malignant peripheral nerve sheath tumors
These cancers form in the linings of nerves. Treatment includes surgery, radiation therapy and, sometimes, chemotherapy.
Disease
Meralgia paresthetica
Learn about this condition that causes burning, tingling and numbness in the thigh, and how to get relief.
Disease
Metastatic prostate cancer
Find out about diagnosis and treatment of this cancer that has spread to the lymph nodes or other parts of the body.
Disease
Mitral valve prolapse
This heart condition, also called Barlow syndrome, affects the valve separating the left heart chambers. Know the symptoms and when it’s treated.
Disease
Molar pregnancy
This rare pregnancy complication requires early treatment. Learn more about diagnosis and treatment of this type of pregnancy loss.
Disease
Myofascial pain syndrome
In this condition, pressure on certain points in the muscles, called trigger points, can cause ongoing muscle pain.
Disease
Narcissistic personality disorder
This mental disorder includes an unreasonably high sense of importance, a need for excessive admiration, fragile self-esteem, and troubled relationships.
Disease
Nasal and paranasal tumors
Learn about these cancerous and noncancerous growths that form in and around the nose. Treatments include surgery, radiation and chemotherapy.
Disease
Nasal polyps
These painless, noncancerous growths can lead to a lost sense of smell or infection. Medicine or surgery can help.
Disease
Neck pain
This common ailment can be the result of poor posture or osteoarthritis. Rarely, it can indicate a more serious issue.
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.