Anorectal manometry has taken on an important role in the investigation of functional anorectal disorders. This investigation studies the two factors, the resistive system and the capacitive system, involved in anorectal function, continence and defecation. Practical indications can be grouped into three categories concerning different aspects of physiopathological, diagnostic and therapeutic interest. Manometry is essential in the investigation of disorders of pelvic static function, is useful in colorectal surgery and of interest in a wide range of proctological diseases.