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The trigger point causes the rest of the fiber segments to be to capacity. It becomes a tight band. Normally the regular contracting and releasing of these little segments circulates blood in the capillaries that supply them (the segments) with their nutrients. When they hold this , blood flow is stopped to that area, there is not an oxygen supply, and waste products are not out. The trigger point then sends out pain signals until the trigger point is put in a position of rest again.