I suffer from Irritable Bowel Syndrome (IBS). I have had to change my diet and exclude those that cause problems. People with IBS are usually lactose intolerant, which means cutting out all dairy products. Deep fried and fatty foods are also a problem. So are acidic foods (tomato sauce, orange juice, all sodas). Finally, eat smaller meals because overeating will cause problems. It could also be other things like colitis or Crohn's disease. I suggest you see a gastrointerologist. In the meantime, make a list of all the things that you eat and drink so that you can see what bothers your GI system and what does not.