Definition of Spasm
Spasm: A brief, automatic jerking movement. A muscle spasm can be quite painful, with the muscle clenching tightly. A spasm of the coronary artery can cause the pain of angina. Spasms in various types of tissue may be caused by stress, medication, and overexercise. Last Editorial Review: 3/19/2012 Back to MedTerms online medical dictionary A-Z List 
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