Delay of endoscopic submucosal dissection-induced gastric ulcer healing by methotrexate.

We report a case of methotrexate (MTX) delaying the healing of an endoscopic submucosal dissection (ESD)-induced gastric ulcer. The patient, who had been taking MTX for rheumatoid arthritis, underwent ESD for early gastric carcinoma. Despite taking vonoprazan after ESD, abdominal pain and anorexia continued, and the gastric ulcer did not heal after the ESD.