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(December 2013) 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.
Other possible causes of muscle weakness include paralytic shellfish poisoning, botulism, and low levels of potassium in the blood. Depending on the cause, weakness may occur in one muscle, a group of muscles, or all the muscles, and it may be accompanied by pain, atrophy, cramping, or other types of muscular symptoms.