A 50-year-old man visited our emergency department with complaints of hematemesis and melena. He had a prior history of metastatic (brain metastasis) pulmonary pleomorphic carcinoma (PC) for 5 months, and brain radiation therapy was performed for the brain metastasis. He did not undergo chemotherapy because of his poor performance status. He reported a 4-month history of weakness and iron deficiency anemia requiring blood transfusion.