We report a case of massive gastric distension presenting with abdominal pain, shock and lower limb ischaemia. At laparotomy, gastric distension was found to be secondary to gastric outflow obstruction compounded by gas formation from antacid ingestion. Both the aorta and inferior vena cava were directly compressed by the distended stomach. This mode of presentation and combined aetiologies remain unreported. Gastric decompression resulted in profound cardiovascular compromise, multiorgan failure and eventually death.