5.2 Six Stages (Liu Jing) Differentiation
Key Takeaways
The Six Stages track Cold damage from the three Yang stages (Taiyang, Yangming, Shaoyang) into the three Yin stages (Taiyin, Shaoyin, Jueyin).
Taiyang Wind-strike has fever, sweating, and a floating moderate pulse, while Taiyang Cold-damage has chills, no sweating, and a floating tight pulse.
Yangming channel pattern shows the Four Bigs (fever, sweat, thirst, surging pulse); Yangming Fu pattern shows tidal fever, constipation, and abdominal fullness that refuses pressure.
Shaoyang is the half-exterior, half-interior pivot with alternating chills and fever, a bitter taste, dry throat, dizziness, and a wiry pulse.
Taiyin is Spleen Yang deficiency with Cold-Damp, Shaoyin splits into Cold (Yang collapse) and Heat (Yin deficiency) forms, and Jueyin shows Heat above with Cold below.
5.2 Six Stages (Liu Jing) Differentiation
Quick Answer: The Six Stages (Liu Jing) are one of the two classical frameworks for tracking externally contracted febrile disease (the other is the Four Levels, Section 5.3). Formulated by Zhang Zhongjing in the Shang Han Lun (circa 200 CE), Six Stages differentiation models the inward transmission of exogenous Cold-induced diseases (Shang Han), progressing from the superficial functional Three Yang stages (Taiyang, Yangming, Shaoyang) to the deeper, degenerative Three Yin stages (Taiyin, Shaoyin, Jueyin). Conversely, formulated by Ye Tian-shi in the Wen Re Lun, Four Levels differentiation governs Warm diseases (Wen Bing), tracking pathogenic Heat as it penetrates through four concentric physiological depths: Wei (defensive exterior), Qi (interior full heat), Ying (nutritive fluid depletion and Shen clouding), and Xue (blood level damage with delirium, convulsions, and hemorrhage).
The Six Stages in Detail
Zhang Zhongjing's Six Stages system organizes the human body's systemic response to Cold invasion. The disease moves from exterior Yang channels to interior Yin viscera, with each stage representing a distinct balance of pathogenic vigor and bodily resistance.
Taiyang (Exterior: Channel & Fu)
↓
Yangming (Interior Heat: Four Bigs / Tidal Fu) ←→ Shaoyang (Half-Exterior Half-Interior Pivot)
↓
Taiyin (Spleen Yang Deficiency Cold)
↓
Shaoyin (Heart/Kidney: Cold Transformation vs. Heat Transformation)
↓
Jueyin (Terminal Yin: Heat Above & Cold Below / Reversal)
1. Taiyang Stage (Greater Yang)
Taiyang is the most exterior stage, governed by the Urinary Bladder and Small Intestine channels. It represents the initial invasion of environmental Wind-Cold into the defensive perimeter of the body. Taiyang is divided into Meridian (Channel) Patterns and Fu (Organ) Patterns.
A. Taiyang Meridian (Channel) Patterns
- Taiyang Zhong Feng (Wind Strike / Attack of Wind - Exterior Deficiency):
- Pathomechanism: Exogenous Wind-Cold attacks the exterior, but Wind dominates, softening the skin and opening the sweat pores. There is disharmony between Ying Qi (Nutritive) and Wei Qi (Defensive); Wei Qi floats outward while Ying Qi leaks out as sweat.
- Core Manifestations: Fever accompanied by aversion to wind (Fa Re Wu Feng), spontaneous mild sweating (Zi Han), stiff neck and occipital headache, sneezing, runny nose, and dry retching.
- Tongue: Pale body with a thin, moist white coating.
- Pulse: Floating and moderate / relaxed (Fu Huan Mai).
- Classic Formula: Gui Zhi Tang (Cinnamon Twig Decoction).
- Taiyang Shang Han (Cold Damage / Attack of Cold - Exterior Excess):
- Pathomechanism: Exogenous Cold dominates, intensely contracting the skin and firmly locking the sweat pores (Cou Li). Wei Qi is trapped inside and cannot circulate.
- Core Manifestations: Severe chills and aversion to cold with mild or high fever, complete absence of sweat (Wu Han), severe occipital headache, generalized myalgia and lumbar ache, stiff joints, dyspnea, wheezing, or asthma.
- Tongue: Normal or pale body with a thin, dry or moist white coating.
- Pulse: Floating and tight (Fu Jin Mai).
- Classic Formula: Ma Huang Tang (Ephedra Decoction).
B. Taiyang Fu (Organ) Patterns
When a Taiyang exterior pathogen is improperly treated or exceptionally virulent, it follows the Bladder channel inward and invades the Bladder Fu organ.
- Taiyang Water Accumulation (Taiyang Xu Shui):
- Pathomechanism: Pathogen invades the Bladder Fu, impairing the organ's ability to transform and vaporize fluids (Qi Hua).
- Core Manifestations: Exterior Taiyang signs (mild fever, aversion to wind) combined with dysuria, urinary retention, lower abdominal distension and fullness, thirst with vomiting of water immediately after drinking (Shui Ni).
- Tongue: Pale with a moist white coating.
- Pulse: Floating (Fu) or floating-rapid.
- Classic Formula: Wu Ling San (Five-Ingredient Powder with Poria).
- Taiyang Blood Accumulation (Taiyang Xu Xue):
- Pathomechanism: Taiyang pathogenic Heat penetrates the interior and binds with Blood in the lower burner (pelvic cavity).
- Core Manifestations: Lower abdominal hardness, fullness, and sharp pain, normal and smooth urination (confirming the problem is in the Blood, not the water passages), mental restlessness, mania, or amnesia (Kuang / Shan Wang), and dark or black tarry stools.
- Tongue: Purplish body or dark spots on the edges with a thin yellow or dry coating.
- Pulse: Deep, choppy (Se), or knotted (Jie).
- Classic Formula: Tao He Cheng Qi Tang (Peach Pit Decoction to Order the Qi).
2. Yangming Stage (Yang Brightness)
The Yangming stage represents the peak of interior Yang heat. When a pathogen enters Yangming, all aversion to cold ceases; the pathogen has completely transformed into interior Heat. Yangming is divided into Meridian (Channel) and Fu (Organ) patterns.
A. Yangming Meridian (Channel) Pattern
- Pathomechanism: Heat blazes furiously throughout the Yangming (Stomach and Large Intestine) channels and Qi level without physical bowel obstruction.
- Hallmark Manifestations: The classic Four Bigs (Si Da):
- Big Fever (Da Re): High fever without any chills, strong aversion to heat.
- Big Sweat (Da Han): Profuse, drenching daytime sweating across the entire body.
- Big Thirst (Da Ke): Unquenchable thirst with a craving for massive amounts of cold water.
- Big Pulse (Da Mai / Hong Mai): Surging, overflowing, full, and rapid pulse.
- Tongue: Bright red body covered with a dry, yellow coating.
- Classic Formula: Bai Hu Tang (White Tiger Decoction).
B. Yangming Fu (Organ) Pattern
- Pathomechanism: Yangming Heat scorches internal Body Fluids, causing dry, impacted fecal matter to bind tightly within the Large Intestine (intestinal dryness and obstruction).
- Hallmark Manifestations: The Four Tidal / Repletion Symptoms (Pi, Man, Zao, Shi):
- Pi (Focal Fullness): Epigastric and abdominal oppressive stuffiness.
- Man (Distension): Severe abdominal distension and severe pain aggravated by pressure (Ju An).
- Zao (Dryness): Dry, hard, impacted feces; constipation or foul watery diarrhea leaking around impacted feces (diarrhea of heat repletion).
- Shi (Excess / Repletion): High fever that spikes predictably in the late afternoon from 3:00 PM to 5:00 PM (Tidal Fever / Chao Re), abdominal rigidity, irritability, shouting, manic behavior, and nighttime delirium.
- Tongue: Deep red or crimson body with a thick, dry, rough yellow or charred black coating with prickles (Mang Ci).
- Pulse: Deep, full, forceful, and slippery (Chen Shi You Li).
- Classic Formulas: The Cheng Qi Tang series (Da Cheng Qi Tang, Xiao Cheng Qi Tang, Tiao Wei Cheng Qi Tang).
3. Shaoyang Stage (Lesser Yang)
- Pathomechanism: The pathogen sits in the half-exterior, half-interior (Ban Biao Ban Li) pivot, caught between the exterior Taiyang and the interior Yangming. It directly obstructs the Gallbladder and San Jiao mechanisms.
- Cardinal Manifestations:
- Alternating chills and fever (Han Re Wang Lai) occurring at irregular intervals.
- Fullness, discomfort, and pain in the chest and hypochondriac regions.
- Bitter taste in the mouth (Kou Ku), dry throat (Yan Gan), and dizziness / blurred vision (Mu Xuan).
- Lack of appetite, silent and withdrawn demeanor, irritability, heartburn, nausea, and vomiting.
- Tongue: Red edges, thin white coating or unilaterally yellow/greasy coating.
- Pulse: Wiry (Xian Mai), particularly on the left side.
- Classic Formula: Xiao Chai Hu Tang (Minor Bupleurum Decoction).
4. Taiyin Stage (Greater Yin)
- Pathomechanism: The first of the Yin stages, signifying the transmission of disease into the visceral interior. It reflects Spleen Yang deficiency with accumulation of interior Cold-Dampness.
- Core Manifestations: Abdominal fullness and distension, dull abdominal pain that improves with warmth and pressure, vomiting, watery diarrhea, complete absence of thirst, fatigue, and cold extremities.
- Tongue: Pale, swollen, wet body with teeth marks and a thick, moist white coating.
- Pulse: Deep, slow, and weak (Chen Chi Ruo).
- Classic Formula: Li Zhong Wan (Regulate the Middle Pill).
5. Shaoyin Stage (Lesser Yin)
The Shaoyin stage represents critical systemic pathology involving the Heart and Kidney. Because the Kidney houses both True Water (Yin) and True Fire (Yang), Shaoyin disease bifurcates into two opposing presentations:
A. Shaoyin Cold Transformation (Shaoyin Hua Han - Yang Deficiency)
- Pathomechanism: Kidney and Heart Yang collapse. The body loses all metabolic fire.
- Core Manifestations: Extreme aversion to cold, cold limbs reaching the elbows and knees (Jue Leng), curled-up fetal posture in bed, extreme listlessness, lethargy, somnolence (sleeping constantly with difficulty waking), profuse clear urination, watery diarrhea with completely undigested food, and absence of fever.
- Tongue: Pale, flaccid, wet, swollen body with a thin white coat.
- Pulse: Faint, minute, and almost imperceptible (Wei Xi Yu Jue).
- Classic Formula: Si Ni Tang (Frigid Extremities Decoction).
B. Shaoyin Heat Transformation (Shaoyin Hua Re - Yin Deficiency Fire)
- Pathomechanism: Kidney Yin is consumed, failing to nourish Heart Yin and allowing hyperactive Heart Fire to flare out of control (Yin deficiency with Empty Heat).
- Core Manifestations: Severe insomnia, persistent mental restlessness, anxiety, sensation of heat in the chest, dry mouth and throat without desire to drink large quantities, low-grade afternoon fever, and dark scanty urine.
- Tongue: Deep red body, redder tip, completely stripped/peeled of coating (Guang Bo).
- Pulse: Thready and rapid (Xi Shu Mai).
- Classic Formula: Huang Lian E Jiao Tang (Coptis and Ass-Hide Gelatin Decoction).
6. Jueyin Stage (Terminal Yin)
- Pathomechanism: The most advanced, complex, and chaotic stage of Six Stages disease. Jueyin represents the reversal of Qi (Jue) and the extreme collision of opposing forces: Heat Above and Cold Below (Shang Re Xia Han).
- Core Manifestations:
- Persistent thirst accompanied by a sensation of energy or heat rushing upward to the chest.
- Pain and burning heat in the epigastrium and Heart region.
- Hunger with no desire to eat (Ji Bu Yu Shi); eating immediately triggers nausea or vomiting.
- Vomiting of roundworms (Hui Que) provoked by abdominal cold.
- Cold extremities while the torso or head feels hot.
- Tongue: Red tip and edges with a greasy, white or yellow slippery coating.
- Pulse: Wiry (Xian), deep, or hidden (Fu).
- Classic Formula: Wu Mei Wan (Mume Pill).
| Stage | Primary Organs | Hallmark Symptoms | Tongue & Pulse | Classic Formula |
|---|---|---|---|---|
| Taiyang Zhong Feng | Bladder, Wei/Ying | Fever, chills, sweat, stiff neck | Pale; floating-moderate (Fu Huan) | Gui Zhi Tang |
| Taiyang Shang Han | Bladder, Lung | Severe chills, fever, no sweat, asthma | Pale; floating-tight (Fu Jin) | Ma Huang Tang |
| Taiyang Xu Shui | Bladder Fu | Dysuria, vomiting water (Shui Ni) | Moist white; floating | Wu Ling San |
| Taiyang Xu Xue | Bladder/Blood | Lower abdominal pain, mania, black stool | Purple spots; deep, choppy | Tao He Cheng Qi Tang |
| Yangming Meridian | Stomach, Qi Level | Four Bigs: Fever, Sweat, Thirst, Pulse | Red, dry yellow; surging (Hong) | Bai Hu Tang |
| Yangming Fu | Large Intestine | Tidal fever, pain worse w/ pressure, constipation | Red, dry black coat; deep, full | Cheng Qi Tang series |
| Shaoyang | Gallbladder, San Jiao | Alternating chills/fever, bitter taste, nausea | Red edges; wiry (Xian) | Xiao Chai Hu Tang |
| Taiyin | Spleen | Abdominal fullness, diarrhea, dull pain | Pale, wet; deep, slow, weak | Li Zhong Wan |
| Shaoyin Cold | Heart & Kidney Yang | Cold limbs, fetal curl, somnolence | Pale, wet; minute (Wei Xi) | Si Ni Tang |
| Shaoyin Heat | Heart & Kidney Yin | Insomnia, irritability, dry throat | Red, peeled; thready-rapid | Huang Lian E Jiao Tang |
| Jueyin | Liver & Pericardium | Heat above/cold below, vomiting worms | Red edges, greasy coat; wiry | Wu Mei Wan |
A 28-year-old patient who caught an acute respiratory chill three days ago develops an intense high fever, profuse drenching perspiration, severe thirst with constant demands for ice water, and a flushed red face without chills. The tongue body is red with a dry yellow coating, and the radial pulse is forceful, surging, and rapid (Hong Shu). In the Six Stages and Four Levels frameworks, which corresponding patterns describe this patient's state?
Yangming Meridian Pattern (Six Stages) and Qi Level Heat (Four Levels)
Taiyang Water Accumulation (Six Stages) and Wei Level Heat (Four Levels)
Shaoyang Pattern (Six Stages) and Ying Level Heat (Four Levels)
Yangming Fu Pattern (Six Stages) and Xue Level Heat (Four Levels)
A patient with an unresolved exterior illness presents with alternating bouts of chills and fever occurring several times a day. Additional symptoms include a bitter taste in the mouth, dry throat, dizziness with blurred vision, fullness and discomfort in the hypochondria and chest, and poor appetite with mild nausea. The pulse is wiry (Xian). What is the primary diagnosis and underlying pathomechanism?
Taiyang Shang Han with exterior cold locking the pores
Jueyin Pattern with roundworm agitation and reversal of digestive Qi
Taiyin Pattern with middle burner deficiency-cold and dampness
Shaoyang Pattern with pathogen trapped in the half-exterior, half-interior pivot
A patient with an exterior cold-wind illness reports fever, aversion to wind, a stiff neck, and continuous light sweating. The pulse is floating and moderate. Which Six Stages pattern is present?
Taiyang Shang Han (Cold damage)
Taiyang Zhong Feng (Wind strike)
Yangming channel pattern
Taiyang Water Accumulation
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