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The complexion of Zhonghan (Cold Damage) must manifest as cyanosis, because cyanosis is the color associated with the Liver. Therefore, Zhang Zhongjing stated: "If the tip of the nose appears cyanotic, accompanied by abdominal pain, and the patient suffers from severe cold aversion, the prognosis is fatal."

This refers to the Jueyin Liver channel carrying the coldness of Shaoyin Kidney water. When cold becomes extreme, Yang Qi perishes; once Yang Qi perishes, death ensues.

Cyanosis of the lips and mouth, along with a cold body, indicates that the pathogen has entered the Zang organs, which is fatal.

The Zang organs are Yin in nature within the interior, primarily responsible for storing essence and housing the Shen (Spirit). When Blood and Qi, together with Cold pathogens, invade and block the meridians, the true essence and Qi of the Zang cannot circulate. The mechanism of Shen transformation ceases, and the pathways of ascending, descending, exiting, and entering are all severed. When Ying (Nutritive) Qi perishes, cyanosis of the lips and mouth occurs. The *Ling Shu* states: "When the Qi of the Foot Jueyin [Liver] meridian perishes, the lips turn cyanotic." Since the Liver stores Blood, it can be understood that when Liver Qi perishes, Ying Qi perishes.

When the pulse vanishes (Mai Tuo), if the pathogen enters the Zang organs, it is fatal; if it enters the Fu organs, recovery occurs.

"Tuo" means departure. The meridians are tunnels connecting the Zang and Fu organs. Pressured by Cold pathogens, the Meridional Qi departs from the pulse. If it enters the interior Zang organs, it is fatal; if it enters the interior Fu organs, recovery occurs.

The medical classics state: "When Blood and Qi rush upward simultaneously, Da Jue (Great Syncope) occurs, presenting as sudden collapse resembling death."

"Upward" refers to the areas of Danzhong (Conception Vessel point CV17) and the Sanjiao (Triple Burner). This does not exclusively refer to the pathogen entering the Zang organs. For example, when pathogens invade the Five Collaterals, presenting like Shi Jue (Corpse Syncope), the treatment focuses on unblocking the blood vessels. This merely involves unblocking the blood vessels at the locations where the head and facial collateral vessels pass, leading to recovery; this also does not exclusively refer to the pathogen entering the Fu organs. Thus, it can be seen that "pulse vanishing with entry into Zang or Fu" is a sign manifested in the pulse, whereas "Blood and Qi stagnating upwards" is a sign manifested in symptoms. By cross-referencing and verifying these, one can accurately determine whether the outcome will be death or recovery.

In Zhonghan, if the pulse is Scattered (San), the prognosis is fatal.

Pulse Qi sinking inward enters the Zang, while a scattered pulse moves outward. Sinking inward still allows for differentiation between Zang and Fu, but moving outward signifies the simultaneous loss of Yang Qi without return.

A Chi (Cun Kou position on the wrist) pulse that is slow, stagnant, deep, and fine indicates Cold in the Lower Jiao.

Employing methods to warm the meridians and dissipate Cold, the patient can recover.

Cold-induced pain often manifests on the anterior aspect of the body, as the back belongs to Yang and the anterior aspect belongs to Yin. Within the anterior aspect, it frequently appears in the abdomen, because the chest is Yang within Yin, and the abdomen is Yin within Yin. Zhang Zhongjing discussed pain in the heart and chest, noting that only two or three out of ten cases belong to Cold syndromes; however, for pain in the waist and abdomen, seven or eight out of ten belong to Cold syndromes. This distinction is clear. Here, we cite profound theories from the *Nei Jing* and *Jin Gui Yao Lue* for discussion.

The *Classic* states: "Zhen Xin Tong (True Heart Pain) occurs when Cold pathogens injure the Monarch [Heart]. The hands and feet become cyanotic up to the joints. In severe cases, onset in the morning leads to death in the evening, and onset in the evening leads to death in the morning."

The Heart is the residence of Shen (Spirit), protected by layers of wrapping and myriad defenses, such that countless evils dare not intrude. Only when the body's own defenses are withdrawn and Shen fails to remain secure can Cold pathogens invade. At this stage, using potent and harsh anti-cold agents inevitably involves overstepping boundaries. I have pondered this: one must use large doses of Gancao (Licorice Root) and Renshen (Ginseng Root), adding small amounts of Jiang (Ginger), Fuzi (Aconite Root), and Doukou (Cardamom Fruit) to warm. This ensures the pathogen is expelled while the medicinal force does not linger excessively, which is truly valuable. Without powerful agents to supervise, how can one dare to use violent measures to replace violence?

The *Zhen Jing* (Needle Classic) says: "The branch of the Foot Taiyin Spleen meridian separates from the stomach and ascends to inject into the heart. When this meridian is disturbed, diseases include swelling at the root of the tongue, vomiting after eating, epigastric pain, abdominal distension with frequent belching, and urgent pain in the heart region."

This results from pathogens spreading from Spleen disease to adjacent areas, affecting the Heart. The condition develops gradually and is less severe than the sudden death caused by Zhen Xin Tong. Extending this logic from Taiyin, pathogens invading the Foot Shaoyin Kidney and Foot Jueyin Liver meridians can also affect the Heart. Only when Yang is deficient and Yin Cold prevails (Yin Jue) does the entire body become hostile territory.

Jue Xin Tong (Syncope-related Heart Pain) is heart pain triggered by Cold causing syncope of the limbs. Cold rebels against the Pericardium, differing from Zhen Xin Tong by only a step. Symptoms include cold extremities, profuse cold sweat over the whole body, clear urination and defecation without thirst, weak breath, and low strength. It also predicts death from morning to evening or vice versa. Urgent treatment with Shu Fu Tang (Atractylodes and Aconite Decoction) is required to warm.

For heart pain originating from various meridians, where heart pain radiates to the back and back pain radiates to the heart, urgently warm the meridians. For heart pain originating from Fu organs, characterized by inability to bend or stretch, Qi rushing from the lower abdomen, sudden unconsciousness, vomiting, and diarrhea, with a sharp and acute progression, urgently warm the Fu organs. Regarding heart pain caused by Zang pathogens attacking the Heart, most cases are incurable; urgently warm the Pericardium and guide pathogens out through other collaterals. Clarifying the depth of meridians and Zang-Fu organs allows for effective treatment.

Patients with heart pain invariably present with a Hidden (Fu) pulse, because the Heart governs the vessels, and the intensity of pain causes the pulse to sink. One must not mistake the hidden pulse and mental confusion for Heart Deficiency, nor use Rehmannia (Dihuang) and Atractylodes (Baizhu) for tonification. Pathogens dissipate with warming herbs but persist with cloying tonics; caution is essential. After warming and dispersing, balance Yin and Yang with mild tonification.

The *Jin Gui Yao Lue* discusses the pulse of Xiong Bi (Chest Bi) and heart pain, emphasizing excess and deficiency: "Yang is subtle (Wei), Yin is string-like (Xian)."

Excess Yin overcoming Deficient Yang results in Xiong Bi and heart pain. Ultimately, this stems from Yang deficiency, allowing Yin to invade. Yang naturally tends upward; Yang deficiency implies pathogens attacking the Upper Jiao. If the Yin pulse were not string-like, Yang deficiency alone would not cause Yin to rebel upward. It is precisely because the Yin pulse is string-like that pathogenic Qi rebels and ascends. This shares the same etiology as "turbid Qi residing above generates distension." Xiong Bi varies in severity: mild cases require only tonifying the insufficient Yang of the Upper Jiao; severe cases require driving out the rebellious Yin of the Lower Jiao and unblocking Yang in the chest. Select three or four appropriate herbs from Xiebai (Macrostemon Rhizome), Baijiu (White Wine), Gualou (Trichosanthes Fruit), Banxia (Pinellia Tuber), Guizhi (Cinnamon Twig), Zhishi (Immature Bitter Orange), Houpo (Magnolia Bark), Ganjiang (Dried Ginger), Baizhu (Atractylodes Macrocephala Rhizome), Renshen (Ginseng Root), Gancao (Licorice Root), Fuling (Poria), Xingren (Apricot Seed), or Jupi (Tangerine Peel) to form a prescription. Bitter-cold herbs are excluded, and even cooling herbs are avoided. This is because Yang is treated with Yang; herbs belonging to the Yin category are not permitted. In severe cases, Fuzi (Aconite Root), Wutou (Aconite Lateral Root), and Shujiao (Sichuan Pepper) are used—greatly acrid and hot—to drive out Lower Jiao Yin and restore Upper Jiao Yang. The following three formulas are elucidated for clinicians to follow.

The *Jin Gui Yao Lue* presents another syndrome: "The patient feels like panting but does not pant, like vomiting but does not vomit, like hiccoughing but does not hiccough, feeling profoundly distressed and helpless. Shengjiang Banxia Tang (Fresh Ginger and Pinellia Decoction) is indicated."

This belongs to the Xiong Bi category, hence the formula is similar to those for Xiong Bi, likely due to an editorial error. We discuss it here. Yang receives Qi in the chest; when Yin invades the Yang position, it obstructs the pathway of respiration and Qi movement. Although it resembles panting, vomiting, or hiccoughing, it is actually just profound distress. Therefore, the acrid-warm properties of Banxia and Shengjiang are used to dry dampness and dissipate Cold, leading to recovery. Since rebellious Yin Qi binds with phlegm-fluid in the chest, resolving both allows Yang to distribute and Qi to regulate, opening the chest. Using Jupi (Tangerine Peel) and Shengjiang, or adding Zhuru (Bamboo Shavings) and Renshen, follows this principle.

Elucidation on *Jin Gui Yao Lue*: "Heart pain penetrating the back, back pain penetrating the heart," treated with Wutou Chishizhi Wan (Aconite and Halloysite Pill). Heart pain penetrating the back and back pain penetrating the heart result from Yin Cold Qi rebelling and attacking upward, blocking the meridians between the chest and back, causing牵连 pain, disrupting Blood and Qi, and blurring boundaries. Using Qi-regulating herbs here would worsen the pain and lead to danger. Zhang Zhongjing uses Shujiao and Wutou, highly acrid and warm, to disperse Yin pathogens. However, fearing the chaotic Qi in the chest and back cannot settle, he adds Ganjiang (Dried Ginger) for its cloying nature and Chishizhi (Halloysite) for its astringency to fill the new channels disrupted by rebellious Qi. This allows Chest Qi to remain in the chest and Back Qi to remain in the back, preventing mutual interference and eliminating the ailment. This is the essence of "smelting stones to mend the sky." Do contemporary practitioners know methods to block pathogenic attacks and allow Yin and Yang Qi in the chest and back to coexist without conflict?

Elucidation on *Jin Gui Yao Lue*: "Xiong Bi alternating between relaxation and spasm," treated with Yiyiren Fuzi San (Coix Seed and Aconite Powder). The chest resembles the vast sky, illuminated by the sun, relying on the Zong Qi (Gathering Qi) of Danzhong to encompass the Qi of the whole body. Now, Yang Qi in the chest is blocked and unrelaxed; the meridians passing through exhibit either laxity or spasm, losing their normal rhythm. This is due to the failure of Yang Qi to circulate. Yiyiren (Coix Seed) relaxes the meridians, and Fuzi restores Yang Qi in the chest. Consequently, Zong Qi turns vigorously, Yin turbidity remains none, and the chest opens like the vast sky. As the saying goes, "Under the long-lasting sun, what need is there for relaxation or spasm?"

Elucidation on *Jin Gui Yao Lue*: Jiutong Wan (Nine Pains Pill). Zhang Zhongjing appended Jiutong Wan after discussing Xiong Bi. It treats Nine Types of Heart Pain. Because the lingering pathogen differs from acute illness, the medication is more potent, and the decoction is changed to pills to achieve gradual rather than drastic expulsion. The Nine Types of Heart Pain are chronic, severe conditions, synonymous with Kidney Water Overacting on the Heart or Jiaoxi (Beriberi) Attacking the Heart. Chronic pain leads to Blood stasis and Yin pathogen aggregation. Adding Sheng Ye Langya (Wild Wolf Tooth Herb), Badou (Croton Seed), and Wuzhuyu (Evodia Fruit) to warming-dispersing herbs drives them out through the Yin orifices. Since the pathogen occupies the chest forming a fortress, its nest must be destroyed for it to leave. Observing Zhang Zhongjing's subtle intent across these three formulas reveals the critical importance of True Yang in the Kidneys: life depends on it, death results from its absence.

The *Jin Gui Yao Lue* states: "The Duyang pulse is subtly string-like. According to law, abdominal fullness should occur. If there is no fullness, there must be difficulty in defecation and pain in the flanks. This is Deficient-Cold rising from below; treat with warming medicines."

The Duyang pulse reflects the Spleen and Stomach. A subtly string-like appearance indicates invasion by Jueyin Liver Wood, with Yin Qi accumulating horizontally in the abdomen. Fullness should increase. If there is no fullness, the Yin pathogen will attack upward, and light dispersal is impossible. Once Yin pathogen accumulates, it will not dissipate without warming. If Yin pathogen does not dissipate, the Yin orifices will not open, leading to difficult defecation and rebellion against the flanks causing pain, progressing beyond simple abdominal fullness. Deficient-Cold Qi rises from below, moving from the abdomen to the flanks. Urgently administer warming medicines so that Yin Qi dissipates through the Yin orifices rather than attacking upward. Zhang Zhongjing’s statement, "This is Deficient-Cold rising from below; treat with warming medicines," comprehensively covers the diagnosis and treatment of Yin diseases without omission. Rising Deficient-Cold marks the beginning of Earth Qi ascending to Heaven; warming causes ascending and gathering Qi to descend and scatter. This is direct and thorough. Thus, although the *Zu Bing Lun* is lost, its principles remain clear in mind.

The *Jin Gui Yao Lue* states: "When a patient has abdominal fullness, pressing elicits no pain; this is Deficiency."

"If abdominal fullness decreases intermittently but returns to normal, this is Cold; treat with warming medicines."

Zhonghan patients experiencing diarrhea do so due to Interior Deficiency.

Interior Deficiency with diarrhea requires warming and tonifying Zang Qi to prevent exhaustion.

If a patient presents with sallow complexion, restlessness without thirst, Excess-Cold in the chest, and unceasing diarrhea, the prognosis is fatal.

Sallow complexion indicates the failure of the Middle Jiao Earth; restlessness without thirst indicates Excess-Yin and Deficient-Yang; Excess-Cold in the chest resembles solidified ice. Added to unceasing diarrhea, even vigorous warming cannot save the patient. The hardness is in the chest while the weakness is in the abdomen. The hard area rejects medicine, forcing it toward the weak area, causing frantic movement and accelerating Zang Qi exhaustion. Why not warm early, while Yang Qi in the chest is not yet depleted and Yin Cold is not yet solidified?

Elucidation on *Jin Gui Yao Lue*: "Abdominal Cold causing rumbling and cutting pain, rebellious fullness in the chest and hypochondrium, vomiting," treated with Fuzi Jingmi Tang (Aconite and Rice Decoction).

Abdominal Yin Cold rushes upward, attacking the chest, hypochondrium, and stomach, increasing vomiting. Soon, Stomach Qi becomes empty, offering no barrier to pathogens, which penetrate the Yang position, leading to danger. The key to eliminating this threat lies entirely in preserving Stomach Qi. While the pathogen initially attacks the Stomach and the patient can still eat, use Fuzi and Jingmi (Rice) to warm and nourish the Stomach. A warm and nourished Stomach strengthens Earth, making it difficult for pathogens to ascend. The turbid Yin causing rebellious fullness in the chest and hypochondrium, warmed, will not linger but will exit through the lower orifices, leaving the chest clear. This is the skill required to stabilize critical conditions.

Elucidation on *Jin Gui Yao Lue*: "Abdominal pain with a string-like and tight pulse. String-like indicates Wei (Defensive) Qi obstruction, leading to cold aversion; tight indicates lack of appetite. Struggle between Pathogen and Righteous Qi constitutes Han Shan (Cold Spasm). Han Shan causes peri-umbilical pain. Upon attack, spontaneous sweating occurs, extremities become cold, and the pulse is deep and string-like. Treat with Da Wutou Jian (Major Aconite Decoction)."

Extending from the concept of Xin Shan (Heart Spasm) in the *Nei Jing*, any painful knot in the abdomen can be called Shan, not limited to the testicles. However, Han Shan peri-umbilical pain presents with a superficially string-like and deeply tight pulse. Superficial stringiness obstructs Wei Qi, causing cold aversion; deep tightness indicates severe Stomach Cold failing to digest grain. The Pathogen is Yin Qi in the Stomach; the Righteous Qi is Yang Qi in the Stomach. Both the essence Qi and the fierce Qi of food and drink in the Stomach are considered Righteous Qi. Now, Cold enters the Ying (Nutritive) level and struggles with Wei (Defensive) Qi; thus, Ying becomes Pathogen and Wei becomes Righteous. Peri-umbilical pain, spontaneous sweating, and cold extremities indicate Deficient Yang and Excess Yin, a critical condition. Therefore, the warmth of Wutou combined with the sweetness of honey enters the Stomach to establish the Middle and缓和 the severity. This strengthens Yang in the Wei level, preventing Pathogen retention in the Ying level, adhering to the subtle principle of preventing Deficient-Cold from rising from below.