 Chronic constipation is a strong public health problem. Its prevalence is about 15 in Western countries with a significant impact on quality of life and health care costs . Two subtypes of constipation can be identified: slow transit constipation STC, characterized by impaired propulsion of stool and due to dysfunction of colonic smooth muscle myopathy or its innervation neuropathy, or both; and evacuation disorders, characterized by difficulty or inability with stool expulsion. They include disorders of the anorectal function such as dyssynergic defecation, as well as structural disorders such as rectocele, descending perineum syndrome and rectal prolapse . 