Early symptoms of rectal cancer do not differ much between men and women, because early rectal cancer affects the human body less, so some early rectal cancer may not show obvious abnormal symptoms, but only when the disease is detected during anoscopy or colonoscopy, with the growth of tumor, symptoms will gradually appear when it affects defecation or breaks: 1. The tumor will lead to frequent defecation and change of defecation habit, such as a feeling of anal cramping before defecation, a feeling of incomplete defecation after defecation, or anal pain; 2. It can also be manifested as thin stool or persistent constipation, or constipation and diarrhea alternately. 3. Intestinal stenosis symptoms: When tumor invades into intestinal canal, it will lead to stenosis of intestinal canal, which will easily cause obstruction in intestinal canal, resulting in abdominal pain, abdominal distension, hyperactive bowel sounds and other symptoms. In addition, when the tumor invades the surrounding tissues, such as invading the presacral nerve, it may cause severe and persistent pain in the sacrococcygeal area. Therefore, early diagnosis of rectal cancer needs to be confirmed through rectal finger diagnosis, endoscopy and imaging examination for early detection and early treatment to improve the survival rate of patients.