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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.
Lump or bulge, Muscle cramps or spasms (painful), Muscle twitching (painless), Pain or discomfort. Joint pain, Muscle cramps or spasms (painful), Muscle twitching (painless). Muscle cramps or spasms (painful), Muscle twitching (painless), Numbness or tingling, Restless (urge to move) legs.