I throw out my back about once a year where it is excruciating sharp pain and very tight for about 3 weeks. It is about the worst pain I can imagine, and every time I move, the sciatic nerve just makes me groan in agony. This happened to me last Friday and it was bad. Woke up Saturday morning and it was worse. I got an Icy Hot Tens Therapy unit and have just been using it for 1-2 hours a day, and it made a huge difference right away. I have no idea how this works, but it does. It just lightly massages the place for 30 minutes at a time. It's probably going to be another 7-10 days before I can get back in the gym, and I was so pissed and discouraged last weekend, because I've been getting in shape. However, the pain is a 2 instead of a 10. I highly recommend.