Traditional Tibetan medicine is a centuries-old traditional medical system that employs a complex approach to diagnosis, incorporating techniques such as pulse analysis and urinalysis, and utilizes behavior and dietary modification, medicines composed of natural materials (e.g., herbs and minerals) and physical therapies (e.g. Tibetan acupuncture, moxabustion, etc.) to treat illness. The Tibetan medical system is based upon Indian Buddhist literature (for example Abhidharma and Vajrayana tantras) and Ayurveda. It continues to be practiced in Tibet, India, Nepal, Bhutan, Ladakh, Siberia, China and Mongolia, as well as more recently in parts of Europe and North America. It embraces the traditional Buddhist belief that all illness ultimately results from the three poisons: ignorance, attachment and aversion.