Difficulty in defecation formed by anal blockage of stool can be caused by the following aspects: first, anal swelling prolapse, such as hemorrhoids, anal papillae hypertrophy, etc., due to the swelling of larger prolapse, which affects the smoothness of defecation, and therefore such symptoms as mentioned above. Second, pain, the anus due to pain stimulation contraction termination of defecation, such as anal fissure, perianal abscess, after anal surgery. Third, anal sphincter spasm, anal sphincter muscle tension varies from individual to individual, under the stimulation of inflammation or emotional tension, anxiety, and induced anal sphincter spasm, so there will be a feeling of defecation when the bowel movement does not come out. Fourth, tumor, rectal and abdominal tumors, tumor convex to the lumen so that the lumen space is reduced, or abdominal tumors on the formation of intestinal tract compression, stool through the obstruction, which will lead to the feeling that the anus seems to be blocked. Fifthly, constipation, due to the obstruction of the discharge of dry stools, or congenital weakness, muscle contraction weakness, stools can not be normally pushed to lead to the above symptoms.