Complication of diverticulosis includes bleeding. In addition, the diverticula may get inflamed and result in diverticulitis. Complications of diverticulitis are:

• Abscess – The diverticulum could get infected and result in an abscess
• Perforation: The abscess may burst resulting in infection of the inner lining of the abdomen or peritonitis.
• Stricture: The portion of the inflamed intestine may subsequently stiffen resulting in the formation of a stricture. The stricture could cause bowel obstruction
• Fistula: The burst diverticulum on healing may form an abnormal tract or fistula that connects the intestine with the skin, vagina or urinary tract. In such cases, the patient may pass stool through the skin, vagina, or may pass air through the urinary tract
• Obstruction of the bowel
• Sepsis or widespread infection in the blood that could lead to death

Small bowel diverticula may also be associated with liver or pancreatic disease.