question: My husband hurt his back from a fall for a couple weeks, but when xrayed there was nothing wrong, so he went to the chiro a couple of times and felt great. Maybe unrelated, but about  two days ago, he had a sharp left dull  back pain and when he came home he had  bowel movement and there was blood in it.  Since, then his bowels have been normal, but still has the dull back pain. He says it doesn't feel muscular.  The back pain comes in waves.