Illness the result of natural causes, not demons/supernatural phenomena.
Illness result from disruption of the flow of chi (qi), a vital energy, travels through body along meridians. (Vital energy universal, just different names)
Imbalances of yin and yang can lead to illness.
human body is a microcosm that reflects the world as a whole, the macrocosm.
macrocosm / microcosm correspondence, nature’s Five Phases (or Five Elements) – wood, fire, earth, metal, water – have correspondences to parts of the mind and body. Their relationships can be manipulated by the physician for the benefit of the patient.