May Be Caused by

 Common

Acute pancreatitis

Ascites

 Uncommon

Closed loop bowel obstruction

Duodenal obstruction

Dysphagia

Early mesenteric infarction

Esophageal obstruction

Fluid-filled bowel

Gastric outlet obstruction

Hiatal hernia

Inanition

Large abdominal mass displacing bowel laterally

Vomiting