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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.
Types of Muscle pain. This medical symptom information shows the various types of Muscle pain, and other related symptoms or conditions, including their causes and diagnosis. 1  Muscle cramps. 2  Myalgia. 3  Back muscle pain. 4  Generalised musculoskeletal pain.5  Vague muscle aches.6  Hand cramps.his medical symptom information shows the various types of Muscle pain, and other related symptoms or conditions, including their causes and diagnosis. 1  Muscle cramps. 2  Myalgia. 3  Back muscle pain.