<unk>  most often affects the elderly. In Western countries, diverticular disease most commonly involves the sigmoid colon (95 percent of people with<unk> . The number of people affected with diverticular disease increased from an estimated 10 percent in the 1920s to between 35 and 50 percent by the late 1960s. 65 percent of people over 85 can be expected to have some form of diverticular disease of the colon. Less than 5 percent of those aged 40 years and younger are affected by diverticular disease. Left-sided diverticular disease (involving the sigmoid colon) is most common in the West, while right-sided diverticular disease (involving the ascending colon) is more common in Asia and Africa. Among people with diverticulosis, 4 to 15% may go on to develop<unk> .
Diverticulitis
Irritable bowel syndrome
Ischemic colitis
Segmental colitis associated with diverticulosis
Appendicitis
Diversion colitis
Proctocolitis
Gastroenterocolitis