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 a synthesis of the Indian (Ayurveda), Persian (Unani), Greek, indigenous Tibetan, and Chinese medical systems, and 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" of the mind: ignorance, attachment and aversion.

Like other systems of traditional Asian medicine, and in contrast to biomedicine, Tibetan medicine first puts forth a specific definition of health in its theoretical texts. To have good health, Tibetan medical theory states that it is necessary to maintain balance in the body's three principles of function [often mistranslated as humors]: rLüng (pron. Loong), mKhris-pa (pron. Tree-pa) [often mistranslated as bile], and Bad-kan (pron. Pay-gen) [often mistranslated as phlegm].

• Lung is the source of the body's ability to circulate physical substances (e.g. blood), energy (e.g. nervous system impulses), and the non-physical (e.g. thoughts). In embryological development, the mind's expression of materialism is manifested as the system of rLüng. There are five distinct subcategories of rLung each with specific locations and functions: Srog-'Dzin rLung, Gyen-rGyu rLung, Khyab-Byed rLung, Me-mNyam rLung, Thur-Sel rLung.

• mKhris-pa is characterized by the quantitative and qualitative characteristics of heat, and is the source of many functions such as thermoregulation, metabolism, liver function and discriminating intellect. In embryological development, the mind's expression of aggression is manifested as the system of mKhris-pa. There are five distinct subcategories of mKhris-pa each with specific locations and functions: 'Ju-Byed mKhris-pa, sGrub-Byed mKhris-pa, mDangs-sGyur mKhris-pa, mThong-Byed mKhris-pa, mDog-Sel mKhris-pa.

• Bad-kan is characterized by the quantitative and qualitative characteristics of cold, and is the source of many functions such as aspects of digestion, the maintenance of our physical structure, joint health and mental stability. In embryological development, the mind's expression of ignorance is manifested as the system of Bad-kan. There are five distinct subcategories of Bad-kan each with specific locations and functions: rTen-Byed Bad-kan, Myag-byed Bad-kan, Myong-Byed Bad-kan, Tsim-Byed Bad-kan, 'Byor-Byed Bad-kan. (http://en.wikipedia.org/wiki/Traditional_Tibetan_medicine)