The number of obese people is over one billion worldwide, and the trend is increasing. Frequent failure of conservative approach has been observed. Therefore, various surgical techniques, such as bariatric surgery, are accepted today as a safe and effective treatment of morbid obese condition, and are associated with low perioperative morbidity and mortality rates. The most popular and commonly performed procedures are those related to minimum complications and adequate weight loss: laparoscopic adjustable gastric banding and laparoscopic Roux-en-Y gastric bypass. Since major and minor complications occur in the perioperative, early and late postoperative period, we discuss most frequent complications and importance of early recognition as well as adequate interventions.