Diverticulitis is an illness where an individual's diverticula, pouches that can develop in an individual's intestinal lining, become inflamed and infected. Diverticula most commonly form in an individual's large intestine or colon but can develop at any point in the intestines. In most individuals, they are benign and do not cause problems.
However, the diverticula in some individuals may tear open or become compressed by injury or other structures. These mechanisms can cause the diverticula to become inflamed as the body attempts to repair the damaged tissue, or become infected as a virus or bacteria invade and colonize in the tissue. Pain that occurs from diverticulitis is most commonly located on the lower-left side of an individual's abdomen. Diverticulitis pain is persistent and may last for several days.