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When Liver Heat Disease occurs, the left cheek becomes red first; when Heart Heat Disease occurs, the forehead (Yan) becomes red first; when Spleen Heat Disease occurs, the nose becomes red first; when Lung Heat Disease occurs, the right cheek becomes red first; when Kidney Heat Disease occurs, the chin (Yi) becomes red first. Although the disease has not yet manifested, if redness is observed in these areas, acupuncture should be applied. This is called "treating undiseased states" (Zhi Wei Bing: intervening before or at the very onset of disease).

This passage generally clarifies that latent pathogenic factors (Fu Xie) must inevitably manifest external signs before they fully erupt. The left cheek, forehead, nose, right cheek, and chin are the facial regions where the Qi of the Liver, Heart, Spleen, Lung, and Kidney, respectively, reflects externally. Internal pathology necessarily manifests externally. Even though the disease has not clinically manifested, the complexion changes first, indicating that the pathogen was originally latent within the Blood and Qi. Because it had not yet stirred, it circulated with the Blood and Qi without being perceived. When it is about to erupt, it moves along with the Sheng Qi (vital energy) of the Five Zang organs, thus appearing first as redness on the face. A skilled physician can discern this through observation (Wang Zhen) and, taking advantage of its initial stirring, immediately applies acupuncture to drain the pathogen. Consequently, the pathogenic force will naturally subside, and the disease will certainly become milder. The principles for using herbal medicine can be inferred analogously; this is what is meant by "treating undiseased states."

Heat diseases that begin from specific facial regions will resolve when the corresponding time arrives. For those requiring diaphoresis (sweating therapy), on the day when the affected organ is overcome (Sheng day), profuse sweating will occur and the disease will resolve. To treat various heat diseases, one should first have the patient drink cold water, then apply acupuncture. The patient must wear cool clothing and reside in a cool environment, continuing until the body feels cold.

This section summarizes the treatment methods mentioned above. "Beginning from specific regions" refers to cases such as the left cheek becoming red first in Liver Heat Disease. "Resolving when the time arrives" means that when the Liver corresponds to the Jia-Yi days (Wood days), which are the days when Wood overcomes Earth (or specifically referring to the timing of resolution related to the organ's cycle), profuse sweating leads to recovery. Since the pathogen has been latent for a long time and heat erupts from within, treatment must first involve drinking cold water to drive out heat from the interior; then acupuncture is applied to vent the pathogen from the exterior; finally, wearing cool clothes and residing in a cool place ensures the body cools down and heat is eliminated, at which point treatment stops.

In Taiyang Meridian disorders, luster/redness appears on the zygomatic bone (cheekbone), indicating a Heat Disease. If the Ying (Nutritive) pathogen has not yet intersected with the exterior pathogen, it is said that if sweating can be induced now, the disease will resolve after waiting for the appropriate time. However, if it presents simultaneously with Jueyin Meridian symptoms, death will occur within no more than three days. This is because the heat disease internally connects to the Kidney.

This passage clarifies syndromes where external contraction and latent pathogens mutually trigger each other. This differs from the "Liang Gan" (Two Channels Affected Simultaneously) mentioned in the first chapter. In Liang Gan, both interior and exterior are attacked simultaneously, leading to inevitable death. Here, the external contraction manifests first, followed by the latent pathogen, allowing for survival. If they erupt simultaneously and interact internally and externally, death occurs within three days. "Taiyang Meridian" refers to the pathogen invading the Taiyang meridian, as stated previously: "On the first day, the Great Yang (Ju Yang) receives the pathogen, causing headache, stiff neck, and stiffness in the lower back and spine." "Luster on the zygomatic bone" refers to bright, reddish color appearing on the cheekbones. The cheekbone is the root of the bones, and bones are governed by the Kidney. The Kidney and the Taiyang Bladder meridian are exterior-interior pairs. If latent heat in the Kidney stirs and follows the Ying blood to manifest redness on the cheek, it indicates internal involvement. "Ying has not yet intersected, let it sweat now, wait for the time" means that the exterior pathogen in the Taiyang meridian and the latent heat in the Ying blood have not yet merged. By inducing sweating now, the exterior pathogen is resolved first. The internally latent pathogen may erupt later and can be allowed to resolve when the Zang Qi is prosperous (e.g., Ren-Gui days for Water/Kidney). Alternatively, as mentioned earlier, applying acupuncture upon seeing redness is also valid. If it presents simultaneously with Jueyin Meridian symptoms, both Liver and Kidney harbor heat pathogens. These will inevitably combine with the Taiyang exterior pathogen, making rescue impossible, leading to faster death than in standard Liang Gan cases, within three days. Generally, Liang Gan diseases originate in the meridians and require six days for Stomach Qi to exhaust before death. Here, the heat disease internally connects to the Kidney, severing the fundamental Yuan Qi, hence the rapid death.

Shaoyang Meridian disorders present with facial color changes. In Shaoyang Meridian disorders, luster/redness appears on the front of the cheeks, indicating a Heat Disease. If the Ying pathogen has not yet intersected with the exterior pathogen, it is said that if sweating can be induced now, the disease will resolve after waiting for the time. If it presents simultaneously with Shaoyin Meridian symptoms, death will occur within no more than three days.

Previously, it was stated that in Liver Heat Disease, the left cheek becomes red first. The Liver belongs to Jueyin, and the Gallbladder belongs to Shaoyang; they are exterior-interior pairs. An external pathogen invades the Shaoyang meridian, while the color of latent heat from the Liver manifests on the front of the cheeks. If the interior and exterior pathogens have not yet intersected, inducing sweating now resolves the exterior, and the internally erupting heat can be allowed to resolve with time. If it presents simultaneously with Shaoyin Meridian symptoms, Liver heat connects to Kidney heat, and the interior-exterior pathogens inevitably merge, making rescue difficult, leading to death within three days. Generally, if interior and exterior pathogens erupt sequentially, rescue is possible. If they erupt simultaneously, the pathogens inevitably merge, leading to death. Therefore, the critical phrase is "Ying has not yet intersected." The following chapter, *Ping Re Bing Lun* (Discussion on Heat Diseases), states: "The disease is named Yin-Yang Jiao (Intersection); Jiao implies death." This signifies the meaning of "Ying has already intersected." Here, only Shaoyang and Taiyang cases are cited, excluding Yangming and Taiyin. Their principles can be inferred analogously. Moreover, Yangming and Taiyin belong to the Spleen and Stomach. Even if pathogens intersect, they can be resolved via purgation through the Stomach Fu organ, because the Stomach is the Sea of the Zang-Fu organs. This differs from Shaoyang and Taiyang cases, where pathogens have no outlet and lead to certain death; thus, the classic text omits them.