Jack
                    
                    
                    
                    
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                        I occasionally feel something is in my back  sort of numb left of the T6 to T8 area (appx. nipple  level) that sometimes ends with a slight burning  sensation and dizziness (also slight). I never   feel any pain, but it does feel kind of weird  when it happens. My doctor could not find anything  wrong even with many diagnostic procedures.  Is it possible that a muscle spasm can press against  a blood vessel (like the aorta) and cause the   slight dizziness or could it be something else?