The recent increase in the frequency of bariatric surgery, especially laparoscopic sleeve gastrectomy, is associated with an increase in the frequency of revisional bariatric surgery. The causes of this are numerous but can be summarized as: (1) late fistulae (2) stenosis; (3) gastroesophageal reflux; and (4) weight regain (by increasing or not increasing the gastric volume). We present below a review of the clinical features, diagnosis, and treatment of them.