hello.. the most common cause of having pain while passing stools is Anal Fissure.. this is a cut or wound at anal region.. at times it causes bleeding ... Anal fissures can be very effectively cured by Ayurvedic Medicines.... in chronic cases medicines may b of little help and u may need Kshar Sutra Therapy for permanent cure.. Diet plays a very important role in its management.. try to increase fibre and fruits in ur diet.. avoid oily and spicy foods.. Al d best