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Trigger points are actually the result of the interaction of calcium and adenosine triphosphate (ATP) on muscles that have been stressed in some way. This causes a sort of contraction that shortens the muscle in a localized area, producing a taut band. This in turn generates a lot of localized and uncontrolled metabolic activity in the area, and a decrease in blood circulation, which releases substances that make the nerve endings hyperirritable – and the result is pain. In some cases, microfilaments in the muscles can occur, as well as scar tissue and adhesions.