When there is an excessive strain or an injury to a muscle, it leads to muscle pain. It can occur due to some other reasons also. Most muscle pain is due to tension or overuse. Muscle pain is a sign and symptom of many rheumatic conditions including: lupus, mixed connective tissue disease, fibromyalgia, polymyalgia rheumatica, polymyositis, dermatomyositis, and Lyme disease.
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