I read several of the posts about the rib cage pain on left side and I have the same symptoms. I am at wits end trying to figure out what is wrong. I worry about stomach cancer, ulcers, etc. I will check into the splenik flexure syndrome to see if that will help. I hate going to doctor as they want to run all these test and then never can come to a definite answer. I was in a car accident in 1998 and seat belt cause a lot of tearing of rib cage ligaments-thought I had a broken rib at first. I also have a hiatal hernia and take Prevacid for it (for several years) so feel as if there were an ulcer the Prevacid would prevent it. Any help would be greatly appreciated.