Pelvic floor dysfunction
When an individual wants to have a bowel movement the pelvic floor muscles are supposed to relax allowing the rectum to empty. While the pelvic floor muscles are relaxing, muscles of the abdomen contract to help push the stool out of the rectum. Individuals with pelvic floor dysfunction have a tendency to contract instead of relax the pelvic floor muscles. When this happens during an attempted bowel movement, these individuals are effectively pushing against an unyielding muscular wall.