The secret science behind indian traditional medical science named ayurveda and Siddha are not explored. It is based on Sanatana Dharma, the science dealing with evolution of universe. Ayurveda & Siddha took a part of it and explores the health and unhealth of living beings. Pulse diagnosis is a methodology of diagnosing health status of an individual. The science behind it is explained here as it is in Ayurveda and Siddha.