Kaya-chikitsa is branch of Ayurveda in which prognosis, diagnosis, and treatment take place

Kaya-chikitsa is the most major branch of Ayurveda in which prognosis, diagnosis, and treatment take place. 

‘Kaya’ refers to Agni (fire) in Ayurveda.

Kaya-chikitsa Also known as Agni chikitsa or internal medicine. Now We need to understand what is ‘fire’ or Agni in Ayurveda to understand what is agni chikitsa, From the basic cells of the body to the entire body system is going through a continuous organism process all the time – in Ayurveda, it is called Tridosha(Vata, pitta, and Kapha) and in modern medical science it is called Anabolism, Catabolism, and Metabolism. As long as the Agni of the body is functioning properly till then tridoshas, sapta dhatu, the action of excretion will work fine.

Looking after all the internal functions of the body are conducted properly, with the happiness of the mind and soul, energy development as well as proper consumption by a person, and remain disease-free and healthy, comes under this branch of Ayurveda known as Kaya-chikitsa. There are a total of 13 types of Agni according to Maharshi Charaka. Kaya-chikitsa Majorly take care of jathar-agni also known as digestive fire.

Reference 

Ajay Jadhav