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Summary: burn of upper back pain is a result of a few upper back muscles being both tired and tight This may sound unusual in fact it is the actual mechanism that leads to chronic muscle tightness When muscles tire they tighten When your upper back muscles strain to work they tire tighten and then burn It is the same situation as if you were to sit against a wall with your back
Image Dimensions: 108 x 160
Image originally found here.
