Diverticulosis is a condition in which outpouchings form in the walls of the intestines. These pouches, known as diverticula, are about the size of large peas. They form in weakened areas of the bowels, most often in the lower part of the colon. Diverticulosis is very common, especially in older people. Studies show that about 10 percent of people over the age of 40 and nearly half of over age 60 have diverticulosis.

Diverticulitis is when the diverticulosis outpouchings become infected. This may cause abdominal pain, fever, nausea, vomiting, constipation or diarrhea.