This Subject deals with the Basic & Fundamental Principles of Siddha System of Medicine. It is based upon the 96 basic concepts called ‘96 Thathuvangal’, with a detailed description of the Philosophical knowledge gifted by Siddhars, the Spiritual Scientists. The Department at Excel Siddha Medical College & Research Centre, provides an in-depth knowledge right from the History of the Universe &Evolution of the Human Race, the History of Tamil Nadu and of Siddhars, Scientific Changes with which the World evolves & the Physical and Psychological Discipline to triumph these changes.