1. Objectives We introduced a case of postoperation stomach cancer patient with metastasis to peritoneum and colon who suffered from repetitive diarrhea and abdominal pain. 2. Methods Stomach cancet is the most common cancer in Korea. Eventhough the 5-year survival rate of stomach cancer is increasing recently, metastasized stomach cancer does not show good prognosis, especially when the surgical operation is not applicable. After partial resection of stomach, most of patients experienced gastrointestinal disorders like dyspepsia, reduced meal size, abdominal discomfort, loose stool, and constipation. 3. Results and Conclusions Taeumjowi-tang, a Sasang Constitutional Medicine, improved the diarrhea and abdominal pain.