I was going to a physical therapist and during the exercises, I got a muscle spasm on the other side! I went right back to them and they rubbed the area and put the Tenz on it but it didn't go away. That one lasted about a month. I've had x-rays, CT scans, and MRI. All of them see nothing wrong with my back. I hope I am not boring everyone with this subject, but I am desperate for a cure. One doctor said it might be a nerve irritating that muscle, could I have that nerve cut out?!?