IntroductionLethal symptoms due to graft rejection warrant rapid removal of the transplanted graft to save the patient's life. We report a case of massive pancreas graft bleeding due to chronic rejection that necessitated graft removal after hemostasis by stent graft insertion. Case presentationA 39-year-old woman underwent simultaneous pancreas-kidney transplantation for type I diabetes and chronic renal failure nine years ago. She suffered irreversible kidney damage from severe chronic rejection due to drug non-compliance. She was admitted to the emergency department for abdominal pain and bloody stools. She presented with signs of shock based on her vitals due to massive bleeding in the stool a day after hospitalization and required systemic management in the intensive care unit (ICU). Enhanced computed tomography (CT) scan revealed active bleeding from the duodenal portion of the pancreas graft. Hemostasis was achieved by inserting a stent graft into the right external iliac artery. The respiratory and circulatory status of the patient improved after the intervention, and she was transported to our hospital day after treatment. The graft was removed along with the part of the anastomosed intestine, which was reconstructed with a functional end-to-end anastomosis. ConclusionWe encountered a patient with hemorrhagic shock due to bleeding from a rejected pancreas graft. The patient was successfully treated and saved using stent-graft hemostasis followed by graft removal. Clinicians and surgeons should be mindful of chronic rejection, which could lead to life-threatening hemodynamic complications.