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[Original Script Meaning]

The Yellow Emperor asked: "Now, the so-called heat diseases all belong to the category of cold damage (Shanghan). Some recover, while some die. Those who die usually do so within six or seven days after onset, whereas those who recover usually do so after ten days. What is the reason for this?"

Qibo replied: "The Juyang meridian (i.e., the Taiyang meridian) is the master of all Yang meridians. Its vessels connect to the Fengfu point (GV16), thus it governs the Qi of all Yang meridians. When a person is invaded by cold pathogen, a heat disease occurs. Even if the heat is severe, it will not be fatal; however, if two meridians are simultaneously affected by cold (Lianggan), death is inevitable."

The Yellow Emperor said: "I wish to hear about its specific manifestations."

Qibo said: "On the first day of cold damage, the Juyang meridian is affected. Since its vessels pass through the head and neck and follow the spine, symptoms include headache, stiff neck, and stiffness in the lower back and spine. On the second day, the Yangming meridian is affected. The Yangming meridian governs the flesh, and its vessels run alongside the nose and connect to the eyes, resulting in fever, eye pain, dry nose, and inability to sleep. On the third day, the Shaoyang meridian is affected. The Shaoyang meridian governs the Gallbladder, and its vessels circulate along the hypochondrium and connect to the ears, causing chest and hypochondriac pain and deafness. At this stage, the meridians of the Three Yang are all diseased, but the pathogen has not yet entered the Fu organs; it can be cured by inducing sweating. On the fourth day, the Taiyin meridian is affected. Its vessels spread in the stomach and connect to the throat, leading to abdominal fullness and dry throat. On the fifth day, the Shaoyin meridian is affected. Its vessels penetrate the Kidney, connect to the Lung, and attach to the root of the tongue, causing dry mouth, dry tongue, and thirst. On the sixth day, the Jueyin meridian is affected. Its vessels circulate around the genitalia and connect to the Liver, resulting in irritability, fullness, and retraction of the scrotum. At this stage, the meridians of the Three Yin are all diseased, and the pathogen has entered the Zang organs; it can be cured by purging. If the Three Yin and Three Yang, as well as the Five Zang and Six Fu organs, are all affected, causing the circulation of Ying and Wei Qi to cease and the obstruction of the Five Zang Qi, death will ensue.

For those who did not suffer from simultaneous involvement of two meridians (Lianggan), on the seventh day, the pathology of the Juyang meridian declines, and the headache slightly improves; on the eighth day, the pathology of the Yangming meridian declines, and body heat slightly subsides; on the ninth day, the pathology of the Shaoyang meridian declines, and deafness slightly improves with faint hearing; on the tenth day, the pathology of the Taiyin meridian declines, abdominal distension resolves, appetite returns; on the eleventh day, the pathology of the Shaoyin meridian declines, thirst ceases, abdominal fullness resolves, dry tongue recovers, and sneezing occurs; on the twelfth day, the pathology of the Jueyin meridian declines, the scrotum relaxes, mild lower abdominal tension subsides, the major pathogenic factor dissipates, and the disease gradually heals.

The Yellow Emperor asked: "How should it be treated?"

Qibo replied: "Treatment should focus on unblocking the meridians of each respective organ, and the pathological condition will decline day by day. If the duration is less than three days, sweating can cure it; if it exceeds three days, purging (or clearing heat) can cure it. If the cold pathogen transmits irregularly, or remains confined to one meridian without transmission, and exterior-interior conditions change, treatment must be tailored to the syndrome and pulse using emesis, purgation, sweating, or harmonizing methods, varying by time of day.

The Yellow Emperor asked: "When a heat disease has healed, why does residual heat sometimes persist?"

Qibo replied: "Residual heat persists because food was consumed forcibly while the heat was still intense. In such cases, although the pathogen has declined, heat remains latent. The Qi of the food clashes with the residual heat, and the two heats combine, causing residual heat to linger.

The Yellow Emperor asked: "How should residual heat be treated?"

Qibo replied: "Assess the deficiency or excess, regulate the reversal or smooth flow of Qi, and the disease will surely heal.

The Yellow Emperor asked: "What should be forbidden during a heat disease?"

Qibo replied: "When a heat disease is slightly better, eating meat causes relapse, and overeating causes lingering heat. These are the prohibitions.

The Yellow Emperor asked: "What are the pulse and symptom manifestations for simultaneous involvement of two meridians (Lianggan) by cold?"

Qibo replied: "In Lianggan, on the first day, both Taiyang and Shaoyin are affected, causing headache, dry mouth, and irritability/fullness; on the second day, both Yangming and Taiyin are affected, causing abdominal fullness, fever, anorexia, and delirious speech; on the third day, both Shaoyang and Jueyin are affected, causing deafness, scrotal retraction, cold limbs, inability to swallow fluids, and unconsciousness. Death occurs on the sixth day." (From *Suwen*)

In cold damage, some recover after sweating but die after purging; some die after sweating but recover after purging. Why? The answer is: In cases of Yang deficiency and Yin excess, sweating leads to recovery, while purging leads to death; in cases of Yang excess and Yin deficiency, sweating leads to death, while purging leads to recovery." (From *Nanjing*)

[Three Perspectives on Cold Damage]

Cold pathogen harms humans in three ways: Fog, dew, wind, rain, winter frost, and spring snow constitute the cold of Heaven; secluded rooms, brick floors, stone steps, large rivers, deep marshes, deep valleys, and high mountains constitute the cold of Earth; consuming cold foods, ice, and raw fruits constitutes the cold created by human behavior. (Ke Yunbo)

[Pulse Diagnosis]

The pathogen of cold damage has no fixed form. If it enters Yang meridians, Taiyang is primary; if it enters Yin meridians, Shaoyin is primary. A floating and tight pulse, whether forceful or weak, indicates the deficiency or excess of the Exterior; a sinking and tight pulse, whether forceful or weak, indicates the deficiency or excess of the Interior; a moderate pulse, whether forceful or weak, indicates the auspicious or inauspicious nature of Yin and Yang. (Zhang Jingyue)

Floating, sinking, slow, and rapid pulses cannot originally be divided by Zang-Fu organs. However, since they have Yin-Yang designations, we use Yang for Exterior, Yin for Interior, Fu for Yang, and Zang for Yin to determine the location of the disease. Observe that a floating pulse indicates the Exterior, and the corresponding disease is also external. Yet, a floating pulse may also present Interior signs, either because Exterior pathogen has just sunk inward or because Interior pathogen is attempting to emerge. Ultimately, it does not leave the Exterior, so floating primarily indicates Exterior syndromes—this is the general principle. A sinking pulse indicates the Interior, and the corresponding disease is also internal. However, there may also be Exterior signs, either because a Yang disease shows a Yin pulse (dangerous) or because a Yin disease emerges to Yang (healing). Ultimately, the root lies in the Interior, so sinking primarily indicates Interior syndromes—this is the general principle. Rapid pulse belongs to Yang and indicates Heat. Rapid pulses can be floating or sinking; floating-rapid indicates Exterior Heat, while sinking-rapid indicates Interior Heat. Diseases in the Zang exist, but their origin must come from the Fu, because Yang pulses nourish the Fu, so rapid pulse primarily indicates Fu diseases. Slow pulse belongs to Yin and indicates Cold. Slow pulses can be floating or sinking; floating-slow corresponds to Exterior Cold, while sinking-slow corresponds to Interior Cold. Diseases in the Fu exist, but their root must come from the Zang, because Yin pulses nourish the Zang, so slow pulse primarily indicates Zang diseases. (Ke Yunbo)

Floating indicates Exterior; floating and forceful indicates Cold Damage (Shanghan), while floating and weak indicates Wind Strike (Shangfeng). Sinking indicates Interior; sinking and forceful indicates transmitted Interior syndrome, while sinking and weak indicates direct invasion of the Interior. Slow indicates Cold, primarily involving Zang; Rapid indicates Heat, primarily involving Fu. A prominent Renying pulse (carotid) indicates External contraction; a prominent Qikou pulse (radial) indicates Internal injury. A large pulse indicates disease progression and excess pathogen; a relaxed pulse indicates disease regression and recovery of healthy Qi. If the Cun pulse is slow and weak, sweating is contraindicated; if the Chi pulse is fine and weak, purging is contraindicated. After sweating, if the pulse remains unchanged and Exterior signs persist, repeat sweating; after purging, if the pulse remains unchanged and Interior signs persist, repeat purging. Manic delirium with a sinking-fine pulse indicates death; cold limbs with curled posture and a floating-hong pulse indicates survival. Fever with a floating-hong pulse indicates survival; fever with a sinking-fine pulse indicates death. After sweating, a calm pulse indicates survival; a chaotic pulse indicates death. (From *Shanghan Wufa*)

[Transmission of Meridians]

Taiyang is Juyang, the head of all Yang meridians. If Bladder meridian disease presents with thirst, it means the pathogen has entered its home meridian, named "Transmitting to the Root." ○ Transmission from Taiyang to Yangming is named "Meridian-to-Meridian Transmission." This occurs due to incomplete sweating, diuresis, and residual pathogen penetrating inward. ○ Transmission from Taiyang to Shaoyang is named "Cross-Meridian Transmission." This happens when the initial illness presents with floating pulse and no sweat, requiring Mahuang Decoction which was not used. ○ Transmission from Taiyang to Shaoyin is named "Exterior-Interior Transmission." This results from acute onset where sweating was indicated but purging was mistakenly used. ○ Transmission from Taiyang to Taiyin is named "Mistaken Purge Transmission." This results from initial illness presenting with relaxed pulse and sweat, requiring Guizhi Decoction which was mistakenly replaced by purging. ○ Transmission from Taiyang to Jueyin occurs because the Three Yin meridians do not start at the head; only Jueyin ascends with the Du vessel to connect with Taiyang, named "Meridian-to-Meridian Degree Transmission." (From *Cishi Nan Zhi*)

Cold damage transmission proceeds from Exterior to Interior, with pathogen gradually deepening. Thus, days 1-2 begin at Taiyang, days 2-3 transmit to Yangming, days 3-4 to Shaoyang, days 4-5 to Taiyin, days 5-6 to Shaoyin, and days 6-7 to Jueyin. This describes the normal course. Variations cannot be rigidly bound by days. Transmission to Jueyin marks the end of meridian transmission, with no further transmission.

Cheng Wuji stated: Day 6 Jueyin marks the end of transmission. If not healed by day 7, it is called "Re-transmission," restarting from Taiyang, reaching Jueyin again on day 12, and healing on day 13. If not healed, it is called "Passing the Meridian," implying passing Taiyang again, which is erroneous.

Ma Zhonghua stated: From Taiyang to Jueyin is like entering a house from the gate to the hall to the inner room. For Jueyin to transmit back to Taiyang, it would have to pass Shaoyin, Taiyin, Shaoyang, and Yangming. How could it suddenly transmit to Taiyang? This refutes the error of "re-transmission" and is a definitive judgment for millennia. Unfortunately, his explanation of "day 7 pathology decline" remains unclear, leaving later generations confused. So, is there really no case of pathogen exiting from Interior to Exterior? It is not that the pathogen wants to transmit out, but that it wants to heal and emerge. The *Taiyang Chapter* states: "To resolve spontaneously, one must first feel irritable, then sweat and resolve." How do we know? Because the pulse is floating, we know it resolves via sweat. Floating pulse indicates pathogen returning to Exterior, signaling approaching health. No further decoction is needed; the pathogen disperses outward. Once dispersed, how can it transmit? Know that Interior pathogen, if it does not exit, stays; if it exits, it seeks healing, not transmission.

Some ask: The *Treatise* says Taiyang disease headache heals after seven days because the meridian cycle is complete. If it is to restart the cycle, needle Foot Yangming to prevent transmission and ensure healing. Does this mean days 1-6 transmit through Three Yang and Three Yin, healing on day 7, and if not, Taiyang pathogen transmits to Yangming?

Answer: Cold damage starts at Taiyang and ends at Jueyin, completing the transmission cycle. All meridians healing after seven days do so because they completed their meridian cycle. Taiyang headache healing on day 7 is because the Taiyang meridian cycle is complete. The pathogen moves solely within Taiyang, exhausting the seven-day healing period. The *Treatise* says "Yang diseases heal in seven days" due to the number seven belonging to Yang. If not healed after seven days, intending to pass Taiyang for another cycle, one should needle Foot Yangming to intercept and prevent transmission. Carefully studying "completing its meridian cycle," noting it does not say "transmitting through all meridians," Zhang Zhongjing's intent is clear. Cheng Wuji erroneously interpreted "completing its meridian cycle" as transmitting through all six meridians, creating the theory of re-transmission from Taiyang. If it truly transmitted through all six meridians, Jueyin pathogen transmitting to Taiyang, then Taiyang to Yangming, one should needle Taiyang before Jueyin transmits to it, rather than waiting until Yangming transmission is anticipated to needle Yangming.

Some ask: The *Huo Luan Chapter* mentions healing on day 13 because the meridian cycle is complete. Does this mean six days transmit through Three Yang and Three Yin, followed by six more days completing the cycle, healing on day 13? The *Taiyang Chapter* mentions: "Cold damage unresolved for thirteen days, passing the meridian period with delirium, indicates heat, requiring purging." Does this mean twelve days complete the cycle, and day 13 non-healing is "passing the meridian"?

Answer: "Completing the meridian cycle" refers to Taiyang completing its cycle. Taiyang disease from day 1 to day 7 completes the Taiyang cycle. By analogy, other meridians can be calculated. Yangming disease healing from day 2 to day 8 completes the Yangming cycle; Shaoyang disease healing from day 3 to day 9 completes the Shaoyang cycle; even if transmission reaches Three Yin from days 4-5, healing by day 12 completes the Jueyin cycle. Day 13 is when major pathogen dissipates and spirit refreshes. Thus, if exceeding thirteen days, regardless of pulse position, sinking indicates great danger. "Thirty days unresolved, passing meridian period with delirium" simply means failing to resolve at the expected time, allowing pathogen to enter Interior. Delirium indicates interior excess binding, requiring purging. This broadly refers to "passing the meridian period," not specifying a particular meridian. There is no concept of "re-completing transmission cycle" called "passing the meridian." (Min Ziqing)

Min's theory that transmission through six meridians does not re-transmit is based on *Neijing* principles of sequential transmission and one Zang not being injured twice (double injury leads to death). He argues that mentioning days in transmission should not be rigidly bound by numbers. This is particularly incisive. However, clarification is needed. *Classic* says "Day 1 Taiyang receives it," merely indicating Taiyang disease begins on that day. If Taiyang disease lasts dozens of days, it can still be considered within the "first day" scope of Taiyang. Thus, some live or die entirely within Taiyang. Zhang Zhongjing's chapter on "Unresolved Passing the Meridian" addresses non-transmitting cold damage. "Day 2 Yangming receives it" counts from the start of transmission from Taiyang to Yangming. If staying in Taiyang briefly and transmitting same day, it is Yangming Day 2; if staying in Taiyang for 7-8 days before transmitting, it is also Yangming Day 2. Other meridians follow this logic. The mention of "seven days" uses days to illustrate sequence, like calculating travel time. Speed varies, but distance is fixed. Min's view that seven is a Yang number is somewhat rigid. I believe the day Taiyang disease heals is simply Day 7, which is clearer. Any day Yangming is affected counts as Day 2, merely counting the sequence from Taiyang transmission. Whether long or short stay in Yangming, healing occurs on Day 8, not necessarily because seven combines with Yang numbers. Other meridians follow suit. This seems inconsistent with *Classic* text but deeply aligns with its intent. The *Classic* uses days to establish rules for learning, showing the timeline of six meridians. In reality, pathogen changes are sudden and unpredictable; how can they be counted by days? Knowing to discuss meridians by days but examine disease without rigid day-counting allows one to discuss treating according to classics. Regarding re-transmission from Jueyin to Taiyang, consulting *Neijing* and Zhang Zhongjing reveals no such theory, proving it false. There is no pathway for pathogen to enter Taiyang from Jueyin internally. If pathogen emerges to Exterior, it disperses upward; how can it go from Interior to Exterior and then back to Interior? Ask: Who in history has treated Jueyin re-transmitting to Taiyang? Modern patients with cold damage in Three Yang often face critical outcomes; direct invasion of Yin meridians exists, transmission to Yin is rare, let alone completing all six meridians. Due to weak constitutions today and many incompetent physicians, patients die before transmission completes, making cases of full six-meridian transmission rare. Although *Shanghan Lun* distinguishes six meridians, patients do not strictly adhere to boundaries. Early stages often involve two or three meridians simultaneously; one meridian resolving while another transmits is common; Yang meridians may enter Yin; Taiyin and Shaoyin may coexist; Three Yin may coexist. Hence, Zhang Zhongjing established *He Bing* (Combined Disease) and *Bing Bing* (Concurrent Disease) chapters. While *He Bing* and *Bing Bing* mention Three Yang, they are examples; can they not be extended to Three Yin? Without such deduction, books are useless. (Wei Litong)

[Transmission to Foot Meridians Only, Not Hand Meridians]

Physicians claim cold damage transmits only to Foot meridians, not Hand meridians. Tao Jie'an refuted this, stating Qi and Blood circulate endlessly; how could Hand meridians be spared? Saying Foot meridians are injured but not Hand meridians is acceptable; saying transmission only affects Foot meridians is wrong. But why does cold only injure Foot meridians? After deep thought, the meaning becomes clear. Foot Three Yang descend from head to foot; Foot Three Yin ascend from foot to abdomen. The back, front, sides, and feet are governed by Foot Six Meridians. Hand Three Yang start at hand and end at head; Hand Three Yin start at abdomen and end at hand. Hand Six Meridians govern only hands, with little involvement of head or chest. Moreover, cold damage usually enters via head, face, back, or feet; hand-specific cold invasion is unheard of. This explains Tao's statement that Foot is injured, not Hand. (Yu Fushan)

Cold damage transmission mentions only Foot meridians, omitting Hand meridians. This originates from *Suwen*. Caochuang Liu misunderstood, falsely claiming cold damage only transmits to Foot meridians because Foot meridians belong to Water, Wood, Earth (which succumb to cold), while Hand meridians belong to Metal and Fire (which resist cold). This clever rhetoric misled the ignorant. Human Metal and Fire organs are merely elemental associations, not literal metal and fire immune to damage. This caused confusion: some claimed Foot meridians are lower (Yin) and thus receive Yin cold; others cited directional Qi (Northeast vs Southwest); others linked odd vessels only to Foot meridians. All these theories are false. Qi and Blood flow continuously; why would pathogen stop at Hand meridians? Cold invades skin/hair first (Lung association), causing chills, nasal congestion (Exterior) and cough, asthma (Interior). Is Lung not involved? Entering Hand Shaoyin/Jueyin causes tongue coating issues, coma, delirium. Is Pericardium not involved? Entering Hand Yangming causes diarrhea/constipation. Is Large Intestine not involved? Entering Hand Taiyang causes urinary retention. Is Small Intestine not involved? Entering Hand Shaoyang causes blockage, fullness, dryness. *Suwen* states all Zang-Fu are affected; are Hand meridians excluded? Why does *Classic* omit them? Cold damage is Exterior pathogen. To observe Exterior signs, one examines whole-body vessels, covered by Foot Six Meridians; Hand meridians cannot cover the whole body. Where Hand meridians reach, Foot meridians also reach. Thus, mentioning Foot meridians includes Hand meridians. This explains why *Classic* mentions only Foot meridians: to observe Exterior signs. The meaning is simple, yet confusion persists due to Liu's errors. (Zhang Jingyue)

Predecessors claimed Foot is injured, not Hand. Heart governs Ying, Lung governs Wei. Wind-Cold injuring Ying-Wei involves Hand meridians. Large Intestine connects to Stomach (both Yangming); Small Intestine connects to Bladder (both Taiyang). Injury affects both; why distinguish? Hard stool is Large Intestine disease, not just Stomach; difficult urination is Small Intestine disease, not just Bladder. Sweat is Heart fluid; excessive sweating depletes Yang, affecting both Kan (Kidney) and Danzhong (Pericardium). Ignorance of Zhang Zhongjing's Six Meridians leads to transmission errors. (Ke Yunbo)

[Observing the Eyes]

When treating cold damage, first observe the eyes. Red eyes, cracked lips, black tongue, surging-rapid-forceful pulse, solid stool, extreme thirst, and delirium indicate Yang Toxicity. Purging is required.