Retrograde Jejunogastric Intussusception (RJGI) is a rare but potentially very serious complication of gastrectomy or gastrojejunostomy. It was first described by Bozzi in 1914 in a patient with gastrojejunostomy. Clinically it is of two types acute and chronic. Anatomically it is of three types. The acute form is a surgical emergency. In the acute form there is chance of strangulation of the intussuscepted loop if early intervention is not done. To avoid mortality, early diagnosis and prompt surgical intervention is mandatory. There is no medical treatment for jejunogastric intussusception and surgical intervention is required for the definite treatment. It usually presents with abdominal pain, nausea, vomiting, haematemesis and a palpable diffuse lump in the upper abdomen. A history of gastric surgery can help in making a diagnosis. X-ray can occasionally be diagnostic. Endoscopy performed by someone familiar with this rare entity, is certainly diagnostic. We herein report a case of jejunogastric intussusception who presented with acute abdomen, haematemesis and abdominal lump.