Difficulty in passing stool is a relatively common clinical condition, and its causes should be analyzed. If the patient has anorectal stenosis, such as previous anorectal surgery, hemorrhoid surgery, post-operative may cause anorectal stenosis, during defecation stool passage obstruction, sometimes will have the feeling of bowel movement but can not defecate, sometimes will have the feeling of anorectal swelling, rectal examination can be clearly diagnosed. If a patient has constipation of the outlet obstruction type such as endorectal overlap, anterior rectal protrusion, or puborectal hypertrophy, it may also lead to difficulty in passing stool, poorly passing stool, and sometimes a feeling of incomplete passing of stool. Endorectal stenosis refers to loose mucous membrane that sometimes blocks the anus, resulting in a feeling of inappropriate bowel movements during defecation, which can be clearly diagnosed by performing a fecal imaging. Therefore, there are many reasons for the obstruction of bowel movement, and the diagnosis should be made by combining medical history and physical examination if necessary.