We're not really sure what causes IBS. There are some theories. It may be that it's at the level of the gut, so a spastic colon, or maybe the nerves to the gut are hypersensitive. It may be that ...

These conditions often show up alongside others, like irritable bowel and irritable bladder syndromes, that involve smooth muscle spasm. Taut, hard, painful muscles can keep you awake and limit ...