<unk>  without history of surgery or hernia is malignancy until proven otherwise
"Never let the sun rise or set on a<unk> "
Adhesions (history of previous abdominal surgeries +LR 3.86 and -LR 0.19)
Most common cause in developed countries
Hernia
Port hernias can occur after laparoscopic surgery
Malignancy
Intraluminal strictures
Crohn's disease
Radiation therapy
Mesenteric ischemia
Intussusception (due to lymphoma as lead point)
Foreign body (bezoars)
Trauma (duodenal hematoma)
Gallstone ileus<unk>  bowel volvulus (3-6% of causes of<unk> 
Most common cause in developed countries
Port hernias can occur after laparoscopic surgery
Crohn's disease
Radiation therapy
Mesenteric ischemia
Small bowel obstruction
Abdominal aortic aneurysm
Large bowel obstruction
Aortocaval fistula
Malignant bowel obstruction
Acute gastroenteritis
Epiploic appendagitis
Aortoenteric fisulta