A 50-year-old man was undergone colonoscopy because of chronic lower abdominal pain for six months. No significant abnormalities was found through colonoscopy. Two days later, the patient returned to the hospital, complaining severe lower abdominal pain with hematochezia. On physical examination, his abdomen was soft to palpation, with mild tenderness on lower abdomen. Colonoscopy was performed again, which showed segmentally diffuse hyperemic and hemorrhagic mucosa resembling ischemic colitis in the sigmoid colon. He was put under our conservative treatment. Following up the colonoscopy on the third day of hospitalization, mucosal lesion displayed a remarkable improvement. Currently, he was discharged and is now under observation as an outpatient. The case of patient status complication with ischemic colitis after atraumatic colonoscopy was previously found only in caucasian patients. We are hereby reporting same case of a patient.