India is famous for Adahatmik knowledge, which has deep description of all subject. This Adahatmik knowledge is distributed in Veda, Upnishada, Kanda, Aranake. Ayurved known as upa-veda of Atharva-veda.
The Sanskrit word Agni mean “fire”. Darshan said that, all things in universe made from mahabhuta. Agni is one of the Mahabhuta out of five panchamahabhuta. In jain literature it is called as soul. In pali language agni called as Aggi, which show impact of agni concept on Buddhist tradition also. veda described agni itself is god.
In some In Ayurveda there is a lot of importance to Agni concept. As agni in nature same agni in our body too. Its statement on prakruti-purushsiddhanta of ayurveda. Food is important for the continuation of life in living beings and this food material gets converted into body constituents with the help of Agni.Kayachikitsa is nothing but the Agni chikitsa.
Jatheragni digest food to form aahar-rasa, which then converted into body constituents called Dhatus by dhatvagnies and bhutagnies. If Agni is Prakruta, man lives healthy life, if it gets vitiated then disease occurs. It is responsible for digestion and all metabolism taking place in the body.
In Sushruta Samhita there is description that, origin of pitta is from tapa”. Pitta and agni is related to each other. Dried pachak pitta is nothing but pitta.Agni is one of the Aturapariksha bhavas. The Agni is guessed by examining the capacity of food intake and digestion.
The Agni, which gets affected by irregular qualities of vatadosha are called as Vishamagni. Sometimes it digests properly sometimes not hence sometimes it can enhance Agni and sometimes can’t. It causes diseases like Aadhman, Shula, atisara etc.
When Agni gets affected by oily, cold, manda qualities of Kapha, it is called as Mandagni. It can’t digest food even in small quantities because plenty of Amadravyas remain in aahar rasa. The sama rasa while circulating in the body being unable to enter Strotas and cause strotorodha vitiates dhatus and cause diseases.