Kriya Sharir subject mainly deals with these 3 pillars. The basic concepts,knowledge,and applicability of Tridosha(Vata,Pitta,Kapha),Sapta Dhatus(Rasa,Rakta,Mamsa,Meda,Asthi,Majja,Shukra), and Trimala(Mutra, Purish, Sweda)are very important in the critical understanding of the disease.