1.1 Intra-operative bleeding
1.2 Common bile duct injury and difficult duodenal stump
1.3 Disruption of ampulla of Vater
1.4 Leakage of gastroduodenostomy (Billroth I) and gastrojejunostomy (Billroth II)
1.5 Ischemic necrosis of gastric remnant
1.6 Afferent loop obstruction
1.7 Stomal obstruction