1. Two or more of the following must be met: (1) at least 25% of bowel movements are labored; (2) at least 25% of bowel movements are dry bulbous or hard; (3) at least 25% of bowel movements are incomplete; (4) at least 25% of bowel movements have anorectal obstruction/obstruction; (5) at least 25% of bowel movements require manual assistance (e.g., finger assistance, pelvic floor support); (6) the number of bowel movements is <3/week; (7) there is insufficient evidence to diagnose IBS. (6) The number of bowel movements is <3/week; (2) The occurrence of loose stools is rare without the use of laxatives; (3) There is insufficient evidence to diagnose IBS; the symptoms have been present for at least 6 months prior to diagnosis, and the symptoms in the last 3 months meet the above diagnostic criteria.