The Siddha System is a distinct science comprising of Vatham, Vaidhyam, Yogam and Njanam
Vatham means the process that deals with conversion of quality form, inferior one to the superior one.
Vaidhyam means curative process with various herbs, metals and animals products.
Yogam deals with the path for salvation or the transcendental motivation of the soul.
Njanam deals with philosophical as well as spiritual concepts.
Siddha system has two major concepts regarding its vaidhyam aspect.
Three humoral theory includes vatha, pitha and kapha. They mean basic principles or essential factors related to our life, that determine a person mental and physical qualities.