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Chapter 4 of the Yellow Emperor's Classic of Internal Medicine: Ling Shu — Pathogenic Qi, Viscera, and Bowels (Methods According to the Seasons) — Part 1 of 2

Overall Paraphrase

I. Patterns of Where Pathogenic Qi Injures the Body 🌿

The Yellow Emperor asked Qi Bo: When pathogenic qi attacks the human body, what is the situation like?

Qi Bo replied: When pathogenic qi attacks the human body, there are differences in the location—upper or lower.

The Yellow Emperor asked: Is there any standard for upper and lower?

Qi Bo said: Above the waist, pathogenic qi attacks as wind pathogen; below the waist, pathogenic qi attacks as dampness pathogen. Therefore it is said: When pathogenic qi attacks the body, there is no fixed pattern—when it strikes the yin channels, it flows onward into the six bowels; when it strikes the yang channels, it flows into the channels and vessels.

The Yellow Emperor pursued: The yin and yang channels, though different in name, share the same origin. They meet above and below, interconnect as channels, and are linked like a ring with no beginning or end. When pathogenic qi injures people, sometimes it strikes the yin channels, sometimes the yang channels—there is no regularity to its upper, lower, left, or right. What is the reason for this?

Qi Bo answered: All yang channels converge at the face. When pathogenic qi injures a person, it often takes advantage of the time when the body's upright qi is weakened—for instance, after exertion, after eating with sweating, or when the interstitial spaces (pores of the skin) are opened. The pathogen takes advantage of deficiency and enters. When the pathogen strikes the face, it descends into the Yangming channel; when it strikes the nape and neck, it descends into the Taiyang channel; when it strikes the cheeks, it descends into the Shaoyang channel; when it strikes the chest, back, or flanks, it also enters the corresponding channels respectively.

The Yellow Emperor asked: What about when the pathogen strikes the yin channels?

Qi Bo answered: When it strikes the yin channels, it usually begins from the arms and lower legs. Because the inner sides of the arms and lower legs have thin skin and soft, moist flesh, when encountering wind pathogen equally, only the yin channels are prone to injury.

II. Conditions for Pathogenic Qi Entering the Viscera 🔥

The Yellow Emperor asked: Can this kind of pathogenic qi injure the five viscera?

Qi Bo answered: When the body encounters wind pathogen, it does not necessarily directly injure the five viscera. When pathogenic qi enters the yin channels, if the visceral qi is full and replete, the pathogen cannot remain and will return outward to the six bowels. Therefore: When it strikes the yang channels, it flows through the channels and vessels; when it strikes the yin channels, it flows into the six bowels.

The Yellow Emperor asked: How can pathogenic qi manage to injure the five viscera?

Qi Bo said: Worry, anxiety, fear, and fright injure the heart; the body being exposed to cold and consuming cold food and drink injures the lungs (the original text says "brain," but based on contextual meaning and other versions of the Ling Shu, it should be "lungs"), because external cold and internal cold mutually resonate—both exterior and interior are injured—hence qi rebels upward. Falling from a height, with stagnant blood remaining in the body, compounded by great anger, causes qi to surge upward without descending, accumulating below the ribs, thereby injuring the liver. Being struck and knocked down, or engaging in intercourse after intoxication, or sweating and being exposed to wind, injures the spleen. Using strength to lift heavy objects, or excessive intercourse, or bathing after sweating, injures the kidneys.

The Yellow Emperor asked: What is the key factor for the five viscera being affected by wind pathogen?

Qi Bo answered: When both yin and yang are vacuous (both yin and yang channels are deficient), only then can the pathogenic qi penetrate deep into the five viscera.

III. Why the Face Is Resistant to Cold 💨

The Yellow Emperor said: Well spoken. I would like to ask further: The head and face and the rest of the body are equally connected by bones, linked by sinews and vessels, and interconnected by qi and blood. When the weather is freezing cold and ice cracks the earth, the hands and feet may become numb and stiff from cold, yet the face does not require covering. Why is it not afraid of cold?

Qi Bo answered: The qi and blood of the twelve channels and the three hundred and sixty-five network vessels all ascend to irrigate the face and pass through to the orifices (openings):

Essence-yang qi ascends to the eyes, producing vision;
Bie qi (divergent qi) travels to the ears, producing hearing;
Zong qi (ancestral qi) emerges from the nose, producing smell;
Turbid qi emerges from the stomach, going to the lips and tongue, producing taste.

The fluids of these qi all steam upward to the face, and together with the face's thick skin and firm muscles, no matter how cold the weather, it cannot overcome the warming influence of the face's qi and blood.

IV. The Diagnostic System of Complexion, Pulse, and Forearm Skin 🩺

The Yellow Emperor asked: In what ways do the disease manifestations of deficient pathogen and upright pathogen injuring people differ?

Qi Bo said: When deficient pathogen (a pathogen that takes advantage of deficiency to enter) injures people, it manifests as aversion to cold, shivering, and trembling of the body. When upright pathogen (excess of the seasonal qi) injures people, it first manifests in the complexion—in the body it feels as if present yet absent, as if existing yet vanishing, with form and without form—very difficult to grasp its specific condition.

The Yellow Emperor said: Good. I have heard: One who observes the complexion and knows the disease is called "bright"; one who takes the pulse and knows the disease is called "spirit-like"; one who inquires about the condition and knows the location of the disease is called "skilled." I wish to understand how to achieve "seeing and knowing, palpating and obtaining, inquiring and exhausting."

Qi Bo answered: Complexion, pulse condition, and forearm skin mutually correspond like a drumstick striking a drum, like a form casting a shadow—they cannot contradict one another. This is also like the relationship between a tree's root and branches—if the root dies, the branches and leaves will inevitably wither. Therefore: One who knows one of these is "skilled"; one who knows two is "spirit-like"; one who knows all three is "spirit-like and bright."

The Yellow Emperor said: Please elaborate.

Qi Bo said: Green complexion corresponds to the string-like pulse; red complexion corresponds to the hook-like pulse; yellow complexion corresponds to the intermittent pulse; white complexion corresponds to the floating-hair-like pulse; black complexion corresponds to the stone-like (deep and firm) pulse. If a certain color appears without its corresponding pulse, but instead a mutually overcoming (controlling) pulse appears, the prognosis is poor; if a mutually generating pulse appears, the disease can be cured.

V. Six Pulse Manifestations of Visceral Disease Patterns 🌊

The Yellow Emperor asked: For diseases governed by the five viscera, what are the changes in pulse condition and disease manifestation?

Qi Bo answered: First establish the correspondence between the five colors and the five pulses, then (the patterns of) disease changes can be identified.

The Yellow Emperor asked: After the colors and pulses are determined, how does one further differentiate?

Qi Bo said: By examining the six changes in the pulse—slow, rapid, small, large, slippery, and rough—the pathological changes can be determined.

The Yellow Emperor asked: How does one examine them?

Qi Bo answered: When the pulse is rapid, the skin of the forearm is also tight; when the pulse is slow, the forearm skin is also relaxed; when the pulse is small, the forearm skin is also thin and lacking qi; when the pulse is large, the forearm skin is also raised/swollen; when the pulse is slippery, the forearm skin is also smooth; when the pulse is rough, the forearm skin is also rough. These changes range from mild to severe. Therefore, one who is skilled at examining the forearm skin need not rely on the寸口 (wrist) pulse; one who is skilled at examining pulses need not rely on the complexion. One who can comprehensively employ all three—color, pulse, and forearm skin—is called the superior practitioner, curing nine out of ten; one who masters two of them is called the middle practitioner, curing seven out of ten; one who only masters one is called the lower practitioner, curing six out of ten.

VI. Detailed Explanation of Visceral Pulse and Pathological Manifestations 🔥

The Yellow Emperor asked: What are the specific disease manifestations corresponding to the pulse being slow, rapid, small, large, slippery, or rough?

Qi Bo said: I will discuss the pathological conditions of the five viscera:

Heart Pulse:

Extremely rapid: Convulsions (contractures and spasms); slightly rapid: Heart pain radiating to the back, inability to eat or drink.
Extremely slow: Wild/uncontrollable laughter; slightly slow: Fuliang (cardiac accumulation), located below the heart, moving up and down, occasionally spitting blood.
Extremely large: Obstruction in the throat; slightly large: Heart impediment (Bi) radiating to the back, frequent tearing.
Extremely small: Hiccups; slightly small: Xiaodan (wasting-thirst type).
Extremely slippery: Thirst; slightly slippery: Heart hernia (Shan) radiating to the navel, with rumbling in the lower abdomen.
Extremely rough: Loss of voice; slightly rough: Hemorrhage, cold extremities in all four limbs, tinnitus, and epilepsy.

Lung Pulse:

Extremely rapid: Manic-depressive disorder; slightly rapid: Lung cold-heat, fatigue, coughing with blood, radiating to the lower back, chest, or nasal polyps with blockage.
Extremely slow: Excessive sweating; slightly slow: Atrophy (Wei) syndrome, hemiplegia/ wind deviation, incessant sweating below the head.
Extremely large: Swelling of the lower legs and shins; slightly large: Lung impediment, radiating to the chest and back, aversion to seeing sunlight.
Extremely small: Diarrhea; slightly small: Wasting-thirst (Xiaodan).
Extremely slippery: Xiben upward rebellion (air hunger, wheezing gasping); slightly slippery: Bleeding from both upper and lower orifices.
Extremely rough: Vomiting blood; slightly rough: Shulou (scrofula/lymph node tuberculosis) in the area between the neck and armpits, lower extremities weak and unable to support the body, prone to aching.

Liver Pulse:

Extremely rapid: Vicious/malicious speech; slightly rapid: Feiqi (liver accumulation), below the ribs like an inverted cup.
Extremely slow: Vomiting with rebellious qi; slightly slow: Water accumulation with masses and impediment.
Extremely large: Internal abscess, vomiting blood; slightly large: Liver impediment, penile retraction, cough radiating to the lower abdomen.
Extremely small: Excessive drinking of fluids; slightly small: Wasting-thirst.
Extremely slippery: Hernia; slightly slippery: Bedwetting/incontinence.
Extremely rough: Overflow edema (Yi Yin); slightly rough: Sinews spasming and contracting with cramping.

Spleen Pulse:

Extremely rapid: Convulsions/spasms; slightly rapid: Gezhong (diaphragmatic obstruction), food entering and then returning, spitting foam.
Extremely slow: Four limbs atrophied and weak; slightly slow: Wind atrophy (Feng Wei), four limbs non-functional and useless, yet the mind remains clear as if without disease.
Extremely large: Sudden collapse as if struck; slightly large: Hernia, with large accumulation of pus and blood in the abdomen, outside the stomach and intestines.
Extremely small: Alternating chills and fever; slightly small: Wasting-thirst.
Extremely slippery: Hernia; slightly slippery: Insect/parasite toxicity (roundworm, scorpion), with heat in the abdomen.
Extremely rough: Intestinal ulceration; slightly rough: Internal ulceration, with copious pus and blood discharged from below.

Kidney Pulse:

Extremely rapid: Bone madness/epilepsy; slightly rapid: Deep inversion (Chen Jue), Bentun (running piglet—qi surging upward from the lower abdomen), feet unable to contract, difficulty with urination and defecation.
Extremely slow: Pain as if the lower back and spine were broken/folded; slightly slow: Dongxie (flooding diarrhea with undigested food), eating but not digesting, vomiting immediately upon eating.
Extremely large: Yin atrophy (impotence); slightly large: Stony water (edema condition), swelling from below the navel down to the lower abdomen, extending upward to the stomach duct—poor prognosis.
Extremely small: Flooding diarrhea; slightly small: Wasting-thirst.
Extremely slippery: Hernia; slightly slippery: Bone atrophy (Gu Wei), unable to sit up from a lying position, or upon standing the eyes see nothing.
Extremely rough: Major abscess/carbuncle; slightly rough: Cessation of menstruation (amenorrhea), hemorrhoids.

VII. Acupuncture Principles for the Six Transformations 🌿

The Yellow Emperor asked: For the diseases corresponding to these six pulse transformations, how does one treat them with acupuncture?

Qi Bo answered: A rapid pulse mostly indicates cold; a slow pulse mostly indicates heat; a large pulse indicates excessive qi but deficient blood; a small pulse indicates deficiency of both blood and qi; a slippery pulse indicates hyperactive yang qi with slight heat; a rough pulse indicates excessive blood but deficient qi, with slight cold.

Therefore:

Needling a rapid pulse: Needle deeply and retain the needle for a long time.
Needling a slow pulse: Needle shallowly and withdraw quickly, to expel its heat.
Needling a large pulse: Slightly drain its qi, but do not let blood out.
Needling a slippery pulse: Withdraw the needle quickly with shallow needling, to drain the yang qi and remove its heat.
Needling a rough pulse: Must needle directly into the channel, follow the direction/regulation of the channel qi (forward or backward), and retain the needle long; first press and massage along the channel, and after withdrawing the needle, immediately press closed the needle hole, preventing bleeding, in order to harmonize the channels.
When the pulse is small: Yin, yang, form, and qi are all insufficient; acupuncture should not be used—one should use sweet-flavored medicinals for nourishment and regulation.

VIII. Lower Sea Points of the Six Bowels and Their Disease Patterns 🩺

The Yellow Emperor asked: I have heard that the qi of the five viscera and six bowels enters via the Ying and Shu points where it becomes connected with the He (Sea) points. What is the pathway/handling of this? I wish to understand this reasoning.

Qi Bo replied: This is the pathway by which the yang channels send forth a separate branch inward to connect with and govern the six bowels.

The Yellow Emperor asked: Do the Ying/Shu points and He points each have their own indications and functions?

Qi Bo said: The Ying points and Shu points treat disorders of the external channels. The He points treat disorders of the internal bowels.

The Yellow Emperor asked: How does one treat the internal bowels?

Qi Bo said: Select the He points.

The Yellow Emperor asked: Does each bowel's He point have a fixed name?

Qi Bo answered:

The Stomach feeds into Foot三里 (ST-36, Zusanli);
The Large Intestine feeds into Upper Juxu (ST-37, Shangjuxu) (upper void/shanglian);
The Small Intestine feeds into Lower Juxu (ST-39, Xiajuxu) (lower void/xialian);
The Sanjiao (Triple Burner) feeds into Weiyang (BL-39);
The Bladder feeds into Weizhong (BL-40);
The Gallbladder feeds into Yanglingquan (GB-34).

The Yellow Emperor asked: What is the specific method for needling/selecting these points?

Qi Bo answered:

For Zusanli (ST-36): Take it by lowering the foot dorsum/letting the toe point down;
For Shangjuxu (ST-37) and Xiajuxu (ST-39): Take them by raising the foot;
For Weiyang (BL-39): Bend and extend the lower limb/leg, search for it;
For Weizhong (BL-40): Bend the knee to locate it;
For Yanglingquan (GB-34): Sit upright with knees bent/erect, go down from the knee toward the exterior side of Weiyang(穴);
For treating external channel points (points of the Interstice point both:…as the case:

I. The Hierarchical View of Pathogenic Qi Invasion. Qi Bo constructs a clear model of disease transmission: Pathogenic Qi attacking the Yang channels → spreads through the channels and collaterals; attacking the Yin channels → spreads to the six fu organs; deficiency of both Yin and Yang → pathogenic Qi enters the five zang organs. This is not an arbitrary arrangement, but is based on Traditional Chinese Medicine's fundamental understanding of the body's defense system—the Yang channels are exterior, the Yin channels are interior, the six fu organs are semi-exterior and semi-interior, and the five zang organs are the deepest level. Whether pathogenic Qi can penetrate deeply depends on the degree of充盈 (fullness) of righteous Qi. The saying "When the zang organs are full, pathogenic Qi may enter but cannot take residence, hence it returns to the fu organs," reveals an important therapeutic principle of TCM: The core of "preventive treatment" lies not in "killing the pathogen," but in "strengthening the zang organs."

II. The Physiological Significance of the Face as the "Convergence of All Yang." Qi Bo explains that the face's resistance to cold is not because the face is special, but because the Qi and Blood of the twelve channels and three hundred and sixty-five collaterals "all ascend to the face." This understanding laid the theoretical foundation for later facial diagnosis—the complexion can reflect the overall state of Qi and Blood throughout the body because the face itself is the "window" where Qi and Blood are most concentrated. Simultaneously, Essence-Yang Qi goes to the eyes, the divergent Qi goes to the ears, the Ancestral Qi goes to the nose, and Turbid Qi goes to the lips and tongue, establishing the corresponding relationship between the five sense organs and the Qi and Blood of the zang-fu organs.

III. The Diagnostic System of the Corresponding Complexion, Pulse, and Cubital Skin. One of the most significant academic contributions of this chapter is the proposal of the "Complexion—Pulse—Cubital Skin" trinity diagnostic framework. The complexion reflects the external brilliance of the zang organs, the pulse condition reflects the movement of Qi and Blood, and the cubital skin reflects the prosperity or decline of the physical body. The three are like the "response of drumstick to drum and shadow to form"—as soon as the drum is struck, the sound sounds; as soon as the form stands, the shadow appears—they are inseparable. This thought embodies the principle of holism in TCM diagnosis: instead of looking at one indicator in isolation, it seeks mutual confirmation across multiple dimensions. The quantitative distinction between Superior (saving nine out of ten), Middle (saving seven out of ten), and Inferior (saving six out of ten) practitioners also reflects the ancients' awareness of the levels of diagnostic ability.

IV. Analysis of Six Pulse Patterns—Slow, Rapid, Large, Small, Slippery, and Rough. This is the most systematic content of this chapter. The six pulse patterns correspond to different pathologies of Cold, Heat, Deficiency, and Excess: Rapid indicates Cold, Slow indicates Heat, Large indicates abundant Qi with scarce Blood, Small indicates deficiency of both Qi and Blood, Slippery indicates exuberant Yang Qi with Heat, Rough indicates abundant Blood with scarce Qi and Cold. When the same pulse pattern manifests in the five different zang organs, its presentation varies, reflecting the complexity of the same pulse in different organs, and the same organ showing different pulses. Especially noteworthy is that Qi Bo correlates the pulse condition with the cubital skin, noting "For the rapid pulse, the cubital skin is also rapid." While this method of cross-referencing pulse and cubital skin has been gradually diminished in later pulse diagnosis, it actually provides a very practical "dual verification" method.

Modern Perspectives 🌟

Insights with Reference Value:

"The face is the convergence of all Yang" resonates to some extent with modern anatomy. The face is indeed one of the most densely vascularized areas of the human body; branches of the external carotid artery (facial artery, superficial temporal artery, etc.) form a rich anastomotic network in the face. The ancients attributed the face's cold resistance to "Qi and Blood warming from above," while modern science attributes it to abundant blood supply and subcutaneous fat structure—different explanatory paths, but consistent observational conclusions.
The concept of "Where pathogenic Qi accumulates, righteous Qi must be deficient" (expressed in this chapter as "taken advantage of when weakness is present and after recent exertion... when the interstices are opened, Qi is invaded") overlaps with modern medicine's understanding of the relationship between immune status and susceptibility to infection. Immunity does temporarily decrease after extreme fatigue or profuse sweating, coinciding precisely with the ancients' observation of susceptibility to pathogenic attack during times of "recent exertion" and "sweating with opened interstices."
Although cubital skin diagnosis is rarely used in modern clinical practice, its approach of "inferring the state of Qi and Blood throughout the body from the condition of local skin" bears a formal resemblance to the dermatological insight that certain systemic diseases manifestcutaneously . However, the specific correspondences of cubital skin diagnosis (e.g., racing pulse with racing cubital skin) lack modern empirical support.
The acupuncture principle of "Treating the Fu organs via the Lower He-Sea points" remains an important clinical principle in acupuncture today. Using Zusanli (ST36) for stomach disorders, Yanglingquan (GB34) for gallbladder disorders, and Weizhong (BL40) for bladder disorders, etc., still have widespread application in modern acupuncture practice. Some mechanisms of their effectiveness are thought to be related to somatovisceral reflexes and segmental innervation.

Limitations to View Objectively:

The mechanical correspondence between the five colors (green, red, yellow, white, black) and the five pulses (wire-like, hook-like, lethargic, hair-like, stone-like) is a deduction based on the Five Element classification method, carrying obvious theoretical construction coloring, and should not be used as an independent basis for modern diagnosis.
The detailed descriptions of the six pulses corresponding to the disease manifestations of the five zang organs (e.g., "Extreme rapid pulse in the Heart channel causes convulsions; slightly rapid causes heart pain radiating to the back") are experiential summaries under specific historical conditions by the ancients. Their specific correspondences lack modern epidemiological validation and should be studied as academic historical material rather than clinical guidelines.
The theory of regional mapping of the five zang organs on the face (e.g., "Being struck on the face affects the Yangming channel; being struck on the neck affects the Taiyang channel") belongs to extrapolations of channel circulation theory, and their anatomical basis is not clear.
The quantifications of cure rates for "Superior practitioners at nine out of ten, Middle at seven out of ten, Inferior at six out of ten," despite showing an awareness of academic stratification, are idealized statements and cannot be used as standards for evaluating the level of medical care.

Health Insights ⚡

Moderation in work and rest, cautious avoidance of Deficient Pathogenic Qi: The ancients observed that susceptibility to external pathogenic factors is highest during "recent exertion" and "when the interstices are opened by sweating." In daily life, after strenuous exercise or profuse sweating, one should keep warm and avoid immediate drafts or cooling, providing the body a window for recovery.
Emotional stability, avoid accumulating worry and fear: This chapter explicitly states that "Worry, anxiety, and fear injure the Heart," suggesting that long-term negative emotions consume internal righteous Qi. Cultivating a peaceful mindset and resolving emotions in a timely manner is fundamental to "strengthening the Qi of the Zang Organs."
Maintain moderate food and drink temperature, avoid excessive cold foods and drinks: The statement "Cold body and cold drinks injure the Lungs" reminds us that combining external cold exposure with internal consumption of cold foods and beverages, with cold-pathogenic factors accumulating both internally and externally, most easily affects the respiratory system. Special attention should be paid during seasonal transitions.
Daily care for the face: Abundant Qi and Blood in the face is the external reflection of the overall state of Qi and Blood in the body. Maintaining good sleep schedules and proper Qi and Blood status will naturally keep the face lustrous—this is more fundamental than relying on external skincare products.
Comprehensively observe bodily signals: The concept of the "Corresponding Complexion, Pulse, and Cubital Skin" in this chapter suggests that the various manifestations of the body (complexion, pulse condition, skin state, subjective feelings) form an integrated whole, and changes in any single indicator should not be viewed in isolation.

📚 Related Knowledge

Related Concepts

The Channel System: The concepts of the twelve main channels, the three hundred and sixty-five collaterals, channel divergences, and connecting channels, along with their belonging and connecting relationships with the five zang and six fu organs.
Acupoint Classification: The complete system of the Five Transport Points (Jing-Well, Ying-Spring, Shu-Stream, Jing-River, He-Sea). This chapter focuses on the functional differences among the Ying-Spring, Shu-Stream, and He-Sea points; the locations and indications of the Lower He-Sea points of the six fu organs (Zusanli, Shangjuxu, Xiajuxu, Weiyang, Weizhong, Yanglingquan).
The Six Pathogenic Factors and Disease Location: The pathogenic characteristics of external pathogenic factors such as Wind and Dampness, and the logic distinguishing "above/below the waist."
The Three Elements of Diagnosis: The combined application of inspection (complexion), pulse diagnosis (pulse), and cubital skin diagnosis (cubital skin).
Pathomechanisms of the Five Zang Organs: The concepts of ancient diseases such as Xiao Dan, Fu Liang, Fei Qi, Ben Tun, Shi Shui, and Xi Ben, within the theoretical framework of accumulations in the five zang organs.
Deficiency/Excess and Supplementation/Drainage: Basic principles of acupuncture supplementation and drainage, the difference between "needling the Qi point" and "needling the muscular junction," and the indications for treatment with sweet-flavored medicinals.

灵枢：邪气藏府病形第四法时