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Freebase(4.82 / 22 votes)Rate this definition: Muscle pain. Myalgia, or muscle pain, is a symptom of many diseases and disorders. The most common causes are the overuse or over-stretching of a muscle or group of muscles. Myalgia without a traumatic history is often due to viral infections.
1. Often, cramps. a. an involuntary, usu. painful contraction or spasm of a muscle or muscles. b. a painful contraction of involuntary muscle in the wall of the abdomen, uterus, or other organ.2. writer's cramp. 3. to affect with or as if with a cramp.. Often, cramps. a. an involuntary, usu. painful contraction or spasm of a muscle or muscles. b. a painful contraction of involuntary muscle in the wall of the abdomen, uterus, or other organ.