Fine stools and anal distension may be related to physiological causes such as pregnancy; or pathological causes such as rectal space, pelvic space, etc. 1. Physiological reasons: pregnant women in the middle and late stages of pregnancy, due to the growth of the fetus, can cause pressure on the rectum, the phenomenon of fine stools, anal distension. 2. Pathological causes: such as rectal polyps or rectal cancer and other rectal occupying lesions, due to the growth of the swelling, there may be fine stool, anal swelling; such as uterine fibroids, bladder tumors and other pelvic occupying lesions, with the gradual increase of the tumor, can make the rectal intestinal lumen narrowing, there may be fine stool, anal distension. It is suggested that those who have fine stool and anal distension should go to the hospital in time for systematic examination and clear diagnosis, and if treatment is needed, standardized treatment should be carried out under the guidance of professional doctors to avoid delaying the condition.