| Multiple Myeloma Myeloma bone disease is cancer that affects certain white blood cells called plasma cells. |
| Mastalgia (Breast Pain) The most common type of breast pain is associated with the menstrual cycle and is nearly always hormonal. |
| Mitral Valve Prolapse Mitral valve prolapse is a condition in which blood leaks backward through the mitral valve in the heart. This backflow of blood may result in a heart murmur. |
| Molluscum Contagiosum Detailed information on molluscum contagiosum, including causes, symptoms, diagnosis, and treatment |
| Ménière's Disease Meniere's disease is a balance disorder caused by an abnormality found in a section of the inner ear called the labyrinth. |
| Mumps in Adults Detailed information on mumps, including symptoms, diagnosis, complications, and treatment |
| Manic Depression/Bipolar Disorder Manic depression, also known as bipolar disorder, is a type of affective disorder that goes beyond the day's ordinary ups and downs. It is becoming an important health concern in this country. |
| Major Depression You may have depression if you have a persistent sad or "empty" mood, or if you find it difficult to concentrate or make decisions. |
| Migraine Headaches A migraine headache is unique among headaches because it includes symptoms other than pain. Nausea and vomiting, lightheadedness, and sensitivity to light are common with a migraine. |
| Medial Epicondylitis (Golfer's and Baseball Elbow) Other activities that can cause this condition include carrying a heavy suitcase, chopping wood, and using a chainsaw. |