Ayurveda is the ultimate science among health offering science. Ayurveda is the upveda of Adharvaveda. The immortality and vitality of Ayurveda is always experienced and realised. Kayachikitsa is the fundamental line of treatment of all branches of Ayurveda. Agni is of prime importance in Kayachikitsa, as Kayachikitsa is nothing but the chikitsa of agni. Agni is reflecting health as well as disease through associated symptoms. Kayachikitsa or internal medicine is a subject, which has attached attention of all those who are eager to learn Ayurveda, physician of other medicines, students and common people all wants to know more about this subjects as it deals with description of various disease and its treatment.