1.Most of the early rectal cancer has no symptoms. 2.To a certain extent, change in bowel habit, bloody stool, pus-blood stool, urgency, constipation, diarrhea, etc. will appear. 3. Stool: gradually become thinner, and in the advanced stage, there are obstruction of defecation, emaciation and even cachexia. 4.Tumor: When invading the bladder, urethra, vagina and other surrounding organs, symptoms of urinary tract irritation, vaginal discharge of fecal fluid, pain in the sacral and perineal areas, and edema of the lower limbs will appear.