Irritable bowel symptoms, free ebook. Most individuals are surprised to learn they are not alone with symptoms of IBS. In fact, irritable bowel syndrome (IBS) affects approximately 10-20% of the general population. IBS is a very serious disorder in the digestive system and leads to symptoms such as cramping, abdominal pain, flatulence, bloating, and changes in bowel habits. Most people with IBS experience frequent diarrhea and sudden uncontrollable urges to use the bathroom accompanied with incontinence.