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Magnetic Resonance Imaging (MRI)
A test that takes pictures of the soft tissues in the body.
Malabsorption Syndromes
The small intestine cannot absorb nutrients from foods.
Mallory-Weiss Tear
A tear in the lower end of the esophagus. Caused by severe vomiting. Common in alcoholics.
Malnutrition
A condition caused by not eating enough food or not eating a balanced diet.
Meckel's Diverticulum
A birth defect in which a small sac forms in the ileum.
Megacolon
A huge, swollen colon. Results from severe constipation. 
Melena
Blood in the stool.
Metastasis
the transfer of cels from one part of an organ to another. 
Microwaves
Microwave therapy is a kind of deep heat therapy. The electromagnetic waves pass between electrodes placed on the patient's skin. This creates heat that increases blood flow and relieves muscle and joint pain
Morbidity Rate
The sickness rate. 
Mortality Rate
The death rate.
Mucosal immunity
resistance to infection across the mucous membranes. 
Myalgia
muscular pain
Myenteric
relating to the muscular coat of the intestine
Myocardial Infarction
Caused by obstruction of circulation to a region of the heart Synonym: Heart atack
Myositis
inflammation of a muscle
Myringotomy
draining fluid from within the eardrum with a needle