There are many possible causes, but many cases are related to infection or improper handling of food. Treatment of the underlying disorder is needed but, most important, replacing lost fluids, even when there is no feeling of thirst, is essential. Diverticulosis and diverticulitis. In diverticulosis, which is common in older people, small sacs form on the wall of the large intestine. Although they usually cause no symptoms, occasionally there is pain in the lower side of the abdomen.
Treatment includes a diet high in fiber and liquids.
Diverticulitis develops after the sacs become inflamed and causes a fever. Treatment consists of bed rest and antibiotics. Sometimes symptoms such as pain, diarrhea, constipation, bloating, and gas are caused by a functional disorder such as irritable bowel syndrome. In these disorders there are no signs of disease and yet the intestinal tract still fails to work properly. A functional disorder may cause discomfort, but it is unlikely to lead to a serious disease.