Sigmoid colon cancer T3N0M0 is a postoperative pathologic stage that suggests the patient has stage II sigmoid colon cancer. Sigmoid colon cancer can be judged the risk level of the disease according to TNM staging, T is the depth of primary tumor invading the intestinal wall, N is the lymph node metastasis, M is the metastasis of distant organs.T3 is the tumor invading the deep muscular layer to the subplasma membrane, the N staging is N0 with no lymph node metastasis, the M staging is M0 with no metastasis of distant organs. Sigmoid colon cancer T3N0M0 is stage II sigmoid colon cancer without lymph node or organ metastasis, which may present with abdominal pain and discomfort, or alternating constipation and diarrhea. Patients with stage II sigmoid colon cancer usually choose surgical treatment, and healing will be effective. Therefore, patients with sigmoid colon cancer T3N0M0 should go to the hospital for examination as soon as possible and actively cooperate with doctors for treatment after diagnosis.