Last November I found myself in the emergency room with severe back pain that I thought was a kidney infection, ovary or something down there. Turned out to be nothing more than a bad muscle spasm & sprain. "Earned" after a week of serious quilting for hours on end. It seems that not only sitting for too long, but also the up, down, up down when pressing, and then sitting for hours handsewing that darn binding on, all contributed to sending my muscles into major spasms & sprain.