Ayurveda, the science of life and living has evolved through years. It is as ancient as Vedas. Priliminary thinkings about health care can be seen in
"Rik"veda and 'Adharva'Veda. Ayurveda is also considered as the fifth veda or upaveda of Adharva Veda. The fundamental principles of Ayurveda are based on the metaphysical background. Such decriptions are available in the Ayurvedic texts. They are based on the various Indian philosophies like Nayavaisehika, Sankhya, Yoga and Vedanta with slight modification to suit the aims and objects of Ayurveda.