Muscle knot or spasm: Causes may include repetitive use, persistent postural stress, or an underlying structural problem. The lat. muscles commonly develop knots caused by injury, overuse, or a sedentary lifestyle. The knots are a result of tense muscle tissue that is stuck in a spasm-like state. If the pain persists, see your physician. http://www.nlm.nih.gov/medlineplus/ency/patientinstructions/000063.htm
Answered 9/28/2016
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