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Zhang Zhongjing authored the *Treatise on Cold Damage* (Shanghan Lun), establishing it as the ancestor of decoctions for all generations, and its source actually originates from this chapter of the *Suwen*. This chapter originally discusses cold damage but is named "Discussion on Heat" because "cold" refers to the etiology, while "heat" refers to the pathogenesis.

The Yellow Emperor asked: "Currently, heat diseases are all of the category of cold damage. Some recover, some die; those who die do so within six or seven days, and those who recover do so after ten days or more. Why is this? I do not understand the explanation and wish to hear the reason." (Cold refers to the Qi of winter. During winter, the cold is severe, and all things hide deeply. The superior person maintains solidity and secrecy, avoiding injury by cold; those who touch or offend it are named as having cold damage. Injury by the Qi of the four seasons can all cause disease, but cold damage is the most toxic. It takes advantage of the killing and fierce Qi, entering and causing immediate illness, named cold damage. If it does not cause immediate illness, the cold toxin hides in the skin and muscles. Before the Summer Solstice, it transforms into warm disease; after the Summer Solstice, it transforms into heat disease. However, their onset is caused by cold damage, hence it is said that heat diseases are all of the category of cold damage.)

Qibo replied: "Giant Yang (Taiyang) belongs to all Yang meridians. (Giant means large. The Qi of the Taiyang meridian, through its channels and blood-Qi, nourishes and guards the body, so all Yang Qi belongs to it.) Its pulse reaches the Fengfu acupoint. (Fengfu is an acupoint name, located one cun above the hairline at the nape, in the depression.) Thus, it is the master Qi of all Yang meridians. When humans are injured by cold, they develop heat disease. Even if the heat is severe, it will not be fatal. (Cold toxin attacks the skin, preventing Yang Qi from dispersing outward, leading to internal stagnation and knotting; thus, cold damage manifests as heat disease.) However, those who suffer from 'two-gan' (simultaneous invasion of exterior and interior) due to cold will inevitably die. (When corresponding Zang and Fu organs are simultaneously invaded by cold, it is called two-gan. Note: Cold damage is a disease where the pathogen is acquired over time but manifests suddenly, with unpredictable transmission, difficult differentiation of true and false symptoms, making it the most severe among diseases and the outline for syndrome treatment. Physicians must ponder carefully. Therefore, Xuanyuan and Qibo specifically established theories on it, and Zhang Zhongjing further elaborated. Although Wang Bing's annotations are quite clear, they are not exhaustive. Here, I adopt Min's views for detailed notes, hoping for precise wording and clear logic, so that one may read the 'Heat Discussion' and also the 'Treatise on Cold Damage'. Min, named Zhiqing, was from Xiwu, and produced many works. I regret not seeing them all; this is just a glimpse. Min said: 'This responds to the Emperor's question by first giving a general overview. The Emperor states that heat disease arises from cold damage, so all heat diseases are of the cold damage category. Yet, recovery or death has a specific timeframe. Why? Bo Gao says the Foot-Taiyang meridian is called Giant Yang. Its channel starts at Jingming, connects upward to the Fengfu acupoint of the Du vessel, running from head and neck to back to foot. All Yang meridians of the body and limbs belong to this, accounting for 126 acupoints, truly the master Qi of all Yang. Human injury by cold begins with the Qi of Giant Yang failing to extend outward, stagnating into heat, gradually transmitting inward, becoming heat disease. Severe heat does not kill; some recover as evil Qi declines, others can be treated with sweating or purging. Only when two-gan occurs, affecting two meridians on the first day, is death inevitable.')

The Yellow Emperor said: "I wish to hear the manifestations." Qibo said: "On the first day of cold damage, Giant Yang receives it. Thus, there is headache, stiff neck, and stiffness in the lower back and spine. On the second day, Yangming receives it. Yangming governs flesh; its vessels run along the nose and connect to the eyes. Thus, there is fever, eye pain, dry nose, and inability to sleep. On the third day, Shaoyang receives it. Shaoyang governs the Gallbladder; its vessels follow the flanks and connect to the ears. Thus, there is hypochondriac pain and deafness. When the meridians of the three Yang are diseased but have not entered the Zang organs, it can be cured by sweating. On the fourth day, Taiyin receives it. Taiyin vessels spread in the stomach and connect to the throat. Thus, there is abdominal fullness and dry throat. On the fifth day, Shaoyin receives it. Shaoyin vessels pass through the Kidney, connect to the Lung, and tie to the root of the tongue. Thus, there is dry mouth, dry tongue, and thirst. On the sixth day, Jueyin receives it. Jueyin vessels follow the genitalia and connect to the Liver. Thus, there is vexation, fullness, and retraction of the scrotum. When the three Yin and three Yang, five Zang and six Fu organs are all diseased, Ying and Wei circulation stops, and the five Zang mechanisms are blocked, death ensues. For those not suffering from two-gan, on the seventh day, the disease in Giant Yang declines, and headache slightly improves; on the eighth day, the disease in Yangming declines, and fever slightly improves; on the ninth day, the disease in Shaoyang declines, and hearing slightly returns; on the tenth day, the disease in Taiyin declines, abdominal fullness subsides returning to normal, and appetite returns; on the eleventh day, the disease in Shaoyin declines, thirst stops, bloating ceases, tongue dryness resolves, and sneezing occurs; on the twelfth day, the disease in Jueyin declines, the scrotum relaxes, the lower abdomen slightly softens, the great evil Qi departs, and the disease heals day by day. (Note: This details the reasons for death or recovery in cold damage transmission without two-gan. In the human body, the three Yang are exterior, and the three Yin are interior. Among them, Giant Yang is the outermost of the three Yang; Yangming is the middle, inside Taiyang; Shaoyang is the innermost of the three Yang, inside Yangming. These three Yang constitute the exterior. Among the three Yin, Taiyin is the outermost, inside Shaoyang; Shaoyin is the middle, inside Taiyin; Jueyin is the innermost, inside Shaoyin. These three Yin constitute the interior. Counting from inside out, the sequence is marked as one, two, three. Cold damage moves from exterior to interior. From the perspective of the Six Meridians, it starts with Taiyang and ends with Jueyin; from the perspective of the body, it enters the skin first, then muscle, then half-exterior half-interior, then Zang-Fu organs, deepening daily with meridian transmission. The most exterior meridians are affected first, hence Giant Yang is affected on the first day, which is the Foot-Taiyang Bladder Meridian. Qixuanzi said: 'Taiyang pulse floats.' The *Treatise on Cold Damage* says: 'If the Cun and Chi pulses are both floating, Taiyang is diseased, manifesting on the first or second day.' Zhang Zhongjing meant not to rigidly adhere to the first day, so he discussed each of the six meridians spanning two days. The Taiyang vessel descends from the vertex to the nape, runs along the spine to the waist. Obstruction by evil Qi causes pain and stiffness. If exterior evil does not resolve, it penetrates deeper daily. Hence, on the second day, the Foot-Yangming is affected. On the third day, the Foot-Shaoyang is affected, hence governing the Gallbladder. From Taiyang to Yangming and Shaoyang, if the three Yang meridians are diseased but not yet in the Zang-Fu, it can be cured by sweating. If sweating is indicated but not performed, and the condition persists, by the fourth day, the Foot-Taiyin Spleen Meridian is affected. By the fifth day, the Foot-Shaoyin Kidney Meridian is affected. By the sixth day, the Foot-Jueyin Liver Meridian is affected. The suffering corresponds exactly to the pathway of the vessels. After the three Yang, the three Yin are affected, and the five Zang and six Fu are affected together with the three Yin. If purging is indicated but not performed, and the condition persists, it ultimately leads to cessation of Ying-Wei circulation and blockage of Zang-Fu, resulting in death. This explains why death occurs within six or seven days. However, the pattern of daily transmission of one meridian is not like two-gan, which inevitably leads to death. Those without two-gan may also heal spontaneously. If on the first day Giant Yang is affected, and the disease does not transmit to other meridians nor transform due to mixed pathogens, it should heal spontaneously from the first to the seventh day. The *Treatise on Cold Damage* says: 'Diseases originating in Yang heal in seven days, because seven is the number of Yang. From the second to the eighth day is also seven days and should heal; other meridians follow this calculation. For example, if Shaoyin disease does not transmit or change and declines by the eleventh day, thirst stops, tongue dryness resolves, and sneezing occurs. The *Yuanbing Shi* says: 'Heart fire and evil heat interfere with Yangming, causing nasal itching and sneezing... Sneezing during cold damage decline occurs because the fire-heat has retreated, leaving deficient heat that causes itching, triggering sneezing.' It also says: 'Slight heat causes itching.' From Taiyang to Jueyin, from day one to twelve, if the disease declines without transmission, the great evil Qi departs, and the disease heals daily. This explains why recovery occurs after ten days or more, and why severe heat does not kill. Why, then, does later medicine speak of 're-transmission'? Examining this chapter of the *Neijing* and Zhang Zhongjing's *Treatise on Cold Damage*, this concept is absent; it is an error in Cheng Wuji's commentary. The three Yang are exterior, the three Yin are interior. Moving from Taiyang to Jueyin is like entering a house, ascending to the hall, and entering the room. Having reached Jueyin, how could it exit and transmit back to Taiyang, given that Er Yin, San Yin, Yi Yang, and Er Yang stand in between? There is no logic for sudden transmission back to Taiyang.')

The Yellow Emperor asked: "How should it be treated?" Qibo said: "Treatment requires unblocking the pulse of each respective organ, and the disease will decline daily. If less than three days have passed, it can be cured by sweating; if three days or more have passed, it can be cured by purging. (Note: This addresses the general principle of treatment following the mention of death due to mismanagement. Before three days, when Yang meridian symptoms appear, such as headache, fever, and deafness, sweating can resolve the exterior disease. After three days, when Yin meridian symptoms appear, such as abdominal fullness, dry thirst, and scrotal retraction, purging can resolve the interior disease. By unblocking the pulses of the Zang-Fu organs, the disease declines daily. This again illustrates why severe heat does not kill. According to Zhengli's *Treatise on Cold Damage*: 'A large, floating, rapid pulse indicates exterior disease, treatable by inducing sweat. A fine, sunken, rapid pulse indicates interior disease, treatable by purging.')

If many days have passed but exterior symptoms persist with a large, floating, rapid pulse, sweating is still appropriate. If few days have passed but interior symptoms appear with a fine, sunken, rapid pulse, purging is indicated. The methods of sweating and purging require careful examination of the pulse and differentiation of syndromes; one must not rigidly adhere to the number of days.

The Yellow Emperor asked: "After heat disease has healed, sometimes residual symptoms remain. Why is this?" Qibo said: "All residual symptoms occur because food is forced upon the patient while the heat is still intense. In such cases, the disease has declined, but heat remains hidden. The Qi of the grain clashes with the residual heat, and the two heats combine, causing residuals. The Yellow Emperor said: 'Excellent! How should residuals be treated?' Qibo said: 'Observe deficiency and excess, regulate reversal and顺 (compliance), and the disease will certainly heal.' The Yellow Emperor asked: "What should be prohibited during heat disease?" Qibo said: "When heat disease slightly improves, eating meat causes recurrence, and overeating causes residuals. These are the prohibitions. (Note: This discusses the treatment of residuals and prohibits forced feeding. After intense heat, forcing food causes residual evil to steam with grain Qi, combining two heats, leading to residuals. Observing deficiency and excess to apply tonification or draining appropriately, and regulating reversal and compliance to restore balance, ensures healing. However, it is better to prevent residuals than to treat them afterward. When heat disease slightly improves, Stomach Qi is still weak; meat is hard to digest, stagnates, and aids heat, causing the heat disease to recur. Meat should not be eaten in excess; any food eaten in excess when prohibited will cause heat residuals and must be forbidden.)

The Yellow Emperor asked: "For those suffering from two-gan due to cold, what should the pulse and symptoms be?" Qibo said: "In two-gan due to cold, on the first day, Giant Yang and Shaoyin are both diseased, causing headache, dry mouth, and vexation/fullness. On the second day, Yangming and Taiyin are both diseased, causing abdominal fullness, fever, aversion to food, and delirious speech. On the third day, Shaoyang and Jueyin are both diseased, causing deafness, scrotal retraction, and cold limbs. Inability to take water or gruel, loss of consciousness, leads to death on the sixth day. The Yellow Emperor asked: "The five Zang are damaged, the six Fu are blocked, Ying and Wei do not circulate. After this, why does death occur three days later?" Qibo said: "Yangming is the leader of the twelve meridians, possessing abundant blood and Qi. Thus, loss of consciousness occurs. Three days later, its Qi is exhausted, leading to death. (Note: This explains why two-gan inevitably leads to death on the sixth day. Regarding meridian correspondence and symptoms, two meridians transmit daily, presenting exterior and interior syndromes simultaneously. By the third day, all six meridians are transmitted. Inability to take fluids and loss of consciousness lead to death by the sixth day. At the point of unconsciousness, the five Zang and six Fu are damaged and blocked, and Ying-Wei has ceased; death should logically occur immediately. Why wait three days? Because Yangming is the leader of the twelve meridians, with abundant Qi and Blood. Other meridians receive Qi from Yangming, which disperses into them. Death occurs as Qi exhausts in each meridian, hence on the sixth day. At the third day, although severe, death does not occur immediately because Qi and Blood are not yet fully exhausted. This explains why two-gan inevitably leads to death.)

Any disease transforming from cold damage into warm disease manifests as warm disease if it occurs before the Summer Solstice, and as summerheat disease if it occurs after the Summer Solstice. Summerheat disease should allow sweat to carry the pathogen out; do not stop it. (Note: This concludes that cold damage may not manifest immediately but becomes warm or summerheat disease over time. Immediate manifestation is cold damage. Non-immediate manifestation involves cold toxin hiding in skin and muscles. Manifesting before the Summer Solstice is warm disease; after is summerheat disease. Summerheat involves extreme heat compared to warm disease, named by seasonal timing and symptomatology. Summerheat evil heat moves from interior to exterior, often presenting exterior signs requiring release. The pathogen should exit with sweat; do not obstruct it. The indication for sweating in warm disease is implicit here.)