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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.
Myalgia refers to muscle pain. The pain may be localized, as in a muscle strain or crush injury, or generalized pain caused by an underlying disease such as a viral infection. The most common type of localized muscle pain is caused by muscle overuse or injury from strenuous activity. Myositis refers to muscle inflammation.