Diverticula are small pouches in the bowel wall that become more common with age. They are usually found in the sigmoid colon, the S-shaped last section of the colon in the lower left abdomen. Many people have them without noticing. If they become inflamed, diverticulitis develops, with pain in the lower left abdomen, often with fever and changes in bowel habits.
An uncomplicated flare-up usually settles without surgery. Surgery is mainly performed in the case of complications – abscesses, fistulas, narrowing or a perforation. If the inflammation keeps coming back, the current guideline says that what counts is not the number of flare-ups but how much symptoms and quality of life are affected. Patients weigh this up together with their doctors.
Bowel cancer usually develops over years from polyps that are initially benign. Small polyps and some very early tumours can be removed during a colonoscopy. If that is not enough, the affected section is removed surgically together with the associated lymph nodes and blood vessels.
Chronic inflammatory bowel diseases such as Crohn’s disease can also make surgery necessary, for example if narrowing or fistulas develop. Whether, when and how surgery is performed always depends on the findings, the patient’s general health and their wishes.