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THE FOUR LEVELS (OR STAGES) There are four levels to healing. These first appear in Discussion of Warm Diseases by Ye Tian Shi, written in the late 1600s and early 1700s. These levels or stages evolve in order from the surface to deeply internal; and from a light sickness to death.61 These stages are, in this order: •The wei level is defensive. It is named after wei chi, which guards the body in the skin. It is usually the initial stage of most infections and diseases, caused by the attack of different winds, or atmospheres. A common example problem is warm wind, which is warm evil combined with the wind that attacks the skin. Symptoms on this level often involve the lungs and skin and call for releasing the problematic atmospheres. •The chi level is internal. It describes the battle between the vital chi (or zheng chi) of the body and the warm evil. The warm evil has attacked the zang-fu, producing excessive symptoms, usually internal excess heat. Symptoms arise based on the particular organ systems involved. •The ying level is nutritive. The warm evil (a pathogenic mild heat) has dominated the chi level and is confronting the ying, the chi or precursor of the blood. Ying travels through the blood vessels and the heart, which houses shen, the energy of the mind. •The xue level is the blood. Once the warm evil has entered the blood, the Liver and Kidney systems are involved and bleeding starts. Death can soon follow.
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