I have what I would call a 'pulse' in my stomach/hips when I have my stim on at a certain level. And I have to turn it down slightly. Gosh Rae if its affecting your back you should definitely check it out. I must say for the past couple of nights I have that HORRID burning back in my legs even though Ive my stim on. At times I thought was it actually aggravating the burning......or maybe just having an 'off' day!