The unpleasantries of IBS. Here are the common symptoms of IBS or irratable bowel syndrome. Constipation, diarrhea, alterations between constipation and diarrhea, cramps and abdominal pains. Abnormal gas and bloating. These are just some of the common symptoms of IBS. Some people with IBS may even experience some urinary problems. Some foods have been found to trigger IBS symptoms such as caffiene, alcohol, chocolate and other dairy products and foods high in trans fats such as fries and kentucy fried chicken. Some foods have also been found to decrease the symptoms of IBS, these are foods which are high in fibre. For a more indepth list of foods to avoid with IBS, click the link.