Keywords: angiodysplasia, gastrointestinal bleeding, peritoneal dialysis 〈Abstract〉 A 65 year old male patient with end stage renal disease resulting from type 2 diabetes was started on peritoneal dialysis. Six months later, he developed erythropoiesis stimulating agent hyporesponsive anemia because of bleeding caused by gastric angiodysplasia. He underwent endoscopic hemostasis, and the anemia improved. However, 8 months after the procedure, the gastric angiodysplasia induced anemia recurred. Although he underwent endoscopic hemostasis, gastric bleeding from additional angiodysplastic lesions was detected a few days later. Endoscopic hemostasis was then performed again. Four months later, he was switched from peritoneal dialysis to hemodialysis because he developed refractory peritonitis due to a suspected fungal infection. Subsequently, no gastrointestinal bleeding occurred. Among patients with end stage renal disease, hemodialysis patients are more likely than peritoneal dialysis patients to bleed from gastrointestinal angiodysplastic lesions. However, in this case, a patient who was on peritoneal dialysis experienced repeated bleeding due to gastric angiodysplasia, which ceased after he was switched to hemodialysis. We suggest that switching peritoneal dialysis patients to hemodialysis may prevent recurrent bleeding from gastrointestinal angiodysplastic lesions.