A 28-year-oldwoman visiteda clinic with a complaint of epigastralgia 3 months after delivery. She was diagnosedwith gastritis andtreatedwith medication. Two months later, in January 2006, she was admittedto our hospital with a complaint of dysphagia. Upper gastrointestinal endoscopy revealed type 3 gastric cancer in the lesser curvature of the cardia, and abdominal CT scan showed wall thickening of the upper gastric body. No apparent distant metastases were found. The patient underwent total gastrectomy with D2 lymph node dissection in February 2006. Although there was no peritoneal dissemination, the patient testedpositive in peritoneal lavage cytology. The postoperative pathological diagnosis was gastric cancer pT4aN2M1(P0CY1H0), Stage Ⅳ. She was discharged on postoperative day 22. S-1 monotherapy(100mg/day, day 1- 28q6wks)was performedfor 1 year on an outpatient basis. For 13 years and1 0 months after the surgery, no apparent recurrences of gastric cancer have been observed. In gastric cancers associated with pregnancy, it is difficult to distinguish between perinatal symptoms andsymptoms of gastric disease. Therefore, endoscopic examination shouldbe performedfor perinatal patients presenting with persistent gastrointestinal symptoms.