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Measles
Measles is a highly contagious viral illness that spreads through the air. It most often affects children who are not immune, but…
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Meningiomas
Meningiomas are tumors that arise from the meninges, the protective layers surrounding the brain and spinal cord. Many grow slowly and are…
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Meningococcal Disease
Meningococcal disease is a serious infection caused by the bacterium Neisseria meningitidis. It can cause meningitis, an infection of the tissues around…
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Metabolic Syndrome
Metabolic syndrome is a group of health findings that occur together and raise the risk of heart disease, stroke, and type 2…
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Migraine
Migraine is a neurological condition that can cause recurring attacks of head pain and other symptoms. The pain may be moderate to…
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Mitral Stenosis
Mitral stenosis is a narrowing of the mitral valve, which sits between the heart’s left atrium and left ventricle. This narrowing makes…
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Mitral Valve Disease
The mitral valve is between the left atrium and left ventricle, the two chambers on the left side of the heart. It…
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Mitral Valve Regurgitation
Mitral valve regurgitation is backward blood flow through the mitral valve when it does not close tightly. Normally, this valve allows blood…
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Morbid Obesity
Morbid obesity is an older term for severe obesity, now generally called class 3 obesity. In adults, it is commonly classified using…
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Multiple Myeloma
Multiple myeloma is a blood cancer that begins in plasma cells, immune cells made in the bone marrow. In this disease, abnormal…
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Multiple Sclerosis
Multiple sclerosis is a chronic disease in which an abnormal immune response damages myelin and other nerve structures in the brain and…
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Muscle Tissue Tumor
A muscle tissue tumor is an abnormal growth that develops in skeletal muscle or another type of muscle tissue. Some tumors are…
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Myasthenia Gravis
Myasthenia gravis is an autoimmune disorder that affects communication between nerves and voluntary muscles. The immune system interferes with signals that tell…
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Mycosis Fungoides
Mycosis fungoides is a rare cancer of T lymphocytes, a type of white blood cell that helps the immune system. It commonly…
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Myelitis
Myelitis is inflammation of the spinal cord, the bundle of nerves that carries messages between the brain and body. This inflammation can…
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Myelodysplastic Syndromes
Myelodysplastic syndromes (MDS) are a group of blood cancers that begin in the bone marrow, where blood cells are made. Abnormal marrow…
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Myelofibrosis
Myelofibrosis is a rare, chronic blood cancer in which scar tissue builds up in the bone marrow. The scarring disrupts normal blood-cell…
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Myelogenous Leukemia
Myelogenous leukemia is a cancer of blood-forming tissue, especially the bone marrow, where many blood cells are made. In chronic myelogenous leukemia,…
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Myocarditis
Myocarditis is inflammation of the heart muscle. This inflammation can make it harder for the heart to pump blood and may affect…
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Nasal Polyps
Nasal polyps are soft, teardrop-shaped growths that develop in the lining of the nose or sinuses. They are usually noncancerous and are…
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Nasopharyngeal Cancer
Nasopharyngeal cancer is a cancer that starts in the nasopharynx, the upper part of the throat located behind the nose and above…
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Neck Cancer
Neck cancer is a broad term for a group of cancers that can begin in different tissues of the head and neck,…
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Necrotising Fasciitis
Necrotising fasciitis is a rare, serious bacterial infection that affects the deeper soft tissues of the body. It can destroy skin, fat…
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Necrotizing Ulcerative Gingivitis
Necrotizing ulcerative gingivitis is a painful infection that damages the gum tissue around the teeth. It is also called acute necrotizing ulcerative…
