The Five Elements Theory—derived from the "Chinese Medical Encyclopedia—Tibetan Medicine"

　　Earth, water, fire, wind (air), and space are the five fundamental origins from which the phenomenal world (the material universe) and the emotional world (humans and all living beings) arise; hence they are called the Five Origins. Sometimes, only earth, water, fire, and wind (air) are mentioned, omitting space, and these are referred to as the Four Origins. The Four Origins constitute the basic substances that make up the world. The theory of the Five Origins is a simple, materialistic epistemology originating in ancient India. According to this doctrine, the five elements—earth, water, fire, wind, and the space that provides the medium for the existence, growth, and movement of matter—are interrelated in a dynamic process of mutual generation, evolution, and development. Through abstract reasoning, interpretation, and categorization, this theory seeks to explain the structure and modes of motion of all things. It represents a systematically logical mode of thinking that was early adopted in Buddhist philosophy and Ayurvedic medicine. During its development, Tibetan medicine absorbed the theoretical essence of ancient Indian medicine and incorporated it into its own theoretical framework, using it to elucidate the physiological, pathological, diagnostic, therapeutic principles, as well as the pharmacological theories and mechanisms of action underlying Tibetan medical practice. In the subsequent section of the "Four Medical Tantras," it is stated: "The bodies of all sentient beings are composed of the four elements; diseases arise from the four elements; the properties of medicinal substances are determined by the four elements; and bodily illnesses, medicines, and other related factors are all interconnected with the four elements." The theory of the Five Elements serves as the guiding principle of the theoretical system of Tibetan medicine.

　　The properties of the Earth Element are heaviness, stability, dullness, softness, greasiness, and dryness; it has functions such as strengthening and consolidating the body, and promoting physical growth. The properties of the Water Element are moisture, lubricity, softness, heaviness, dullness, dilution, and coldness; it nourishes, moistens, sinks downward, and consolidates the body. The properties of the Fire Element are heat, sharpness, dryness, roughness, lightness, and movement; it increases body temperature and promotes maturation. The properties of the Wind Element are lightness, movement, dryness, roughness, coldness, and astringency; it facilitates bodily movement, transports blood and vital essence. The properties of the Void Element are emptiness and vacuity; it provides space for the body’s existence, growth, and movement.

　　The five elements are the fundamental substances that constitute the human body. They originate inherently from the father’s essence and the mother’s blood, and during embryonic development, they are further nourished by the mother’s nutrients, thereby increasing in quantity. If any of the five elements is incomplete, conception and fetal development cannot occur. For instance, if the earth element is lacking, even with the other four elements present, the lack of its firm and cohesive function prevents the essence and blood from mixing and solidifying properly. If the water element is deficient, the absence of its gathering function results in the essence and blood merely forming a soft, gelatinous mass of flesh and blood. If the fire element is absent, the embryo cannot mature, since maturation is precisely the function of the fire element. If the wind element is missing, the embryo cannot grow, as growth is the function of the wind element. And if the space element is absent, the embryo lacks the spatial environment necessary for growth and development, because emptiness and void are precisely the functions of the space element. The five elements ingested through diet play a crucial role in promoting the development and growth of various organs and cognitive faculties within the human body. For example, the earth element contributes to the formation and development of muscles, bones, the nose, and the sense of smell; the water element supports the formation and development of blood, the tongue, taste, and moisture; the fire element aids in the development of the eyes, generating body temperature, skin color, and vision; the wind element fosters the development of breath and the sense of touch on the skin; and the space element promotes the formation and development of the ear canals and hearing. The five elements are closely related to the channels (meridians) in Tibetan medicine. According to Tibetan medical theory, there are two types of channels: the white channels or water channels (nerves) and the black channels (blood vessels, i.e., arteries and veins). The white channels belong to the water and earth elements and serve as pathways for the circulation of the water and earth elements; the black channels belong to the fire element and act as conduits for the fire element. The five elements also have close relationships with the internal organs. The heart and small intestine depend on the space element, thus belonging to the space category; the lungs and large intestine rely on the wind element, hence belonging to the wind category; the liver and gallbladder depend on the fire element, making them part of the fire category; the spleen and stomach depend on the earth element, placing them in the earth category; and the kidneys, bladder, and seminal vesicles depend on the water element, thus belonging to the water category. Furthermore, it is believed that all medicinal substances derive from the five elements: the earth element provides the foundation for drug growth, while the water element serves as the condition for drug growth, keeping the drugs moist; the fire element supplies the thermal energy required for drug growth; the wind element acts as the driving force behind drug growth and movement; and the space element offers the essential spatial environment for drug development and growth. None of the five elements can be missing; otherwise, the drugs cannot grow and develop properly. The six tastes of medicinal substances also originate from the five elements: when the earth and water elements predominate, the taste of the drug is sweet; when the fire and earth elements prevail, the taste is sour; when the water and fire elements dominate, the taste is salty; when the water and wind elements are dominant, the taste is bitter; when the fire and wind elements are predominant, the taste is pungent; and when the earth and wind elements are dominant, the taste is astringent. Medicines rich in the earth element tend to be heavy, stable, dull, soft, and greasy, with functions including strengthening limbs, promoting bodily growth, and consolidating tissues and organs—thus treating conditions associated with excess phlegm. Medicines abundant in the water element are thin, cool, heavy, dull, greasy, and soft, having the effect of moisturizing and softening the body—thus treating conditions associated with excess bile. Medicines rich in the fire element are hot, dry, rough, light, greasy, and mobile, enhancing body temperature, aiding digestion and assimilation of nutrients, and clarifying complexion—thus treating conditions associated with excess kapha. Medicines dominated by the wind element are light, mobile, cold, rough, astringent, and dry, hardening the body, promoting movement, and transporting vital essences—thus treating combined disorders of kapha and bile. Medicines enriched by the space element are empty and hollow, providing the necessary space for bodily growth—thus treating combined disorders of phlegm, bile, and kapha. In summary, the five elements are closely linked to every aspect of the body’s physiology, pathology, and therapeutic approaches. Below is a brief overview of their applications in Tibetan medicine: