The hazards of colonic diverticulum include diverticulitis, peridiverticular abscess, bleeding and so on. 1. Diverticulitis: lower abdominal pain, persistent or spasmodic, or recurrent diverticulitis, easy to cause local narrowing or obstruction of the intestinal tract, and even pelvic abscess. 2. Peridiverticular abscess: abscesses around the diverticulum are prone to rupture or perforation, resulting in diffuse peritonitis. 3. Bleeding: Because the diverticulum of the colon is generally close to the mesenteric blood vessel branches, the blood vessel is easily infected and ruptured, causing bleeding, which can be manifested as positive fecal occult blood or blood in stool, etc. If the diverticulum of the colon occurs, it may cause bleeding. If there is diverticulum of the colon, without complications, you can continue to observe; if complications occur, you should consult a doctor in time, under the guidance of the doctor active treatment, so as not to delay the condition.