灵枢：五涛津液别第三十六

Ling Shu: The Differentiation of the Five Kinds of Fluid, Chapter Thirty-Six

Editorial Note: In the title and main text of this chapter, the characters "五涛" (wǔ tāo), "律" (lǜ), "喉" (hóu), and "育" (yù) should be corrected to "五癃" (wǔ lóng), "津" (jīn), "候" (hòu), and "膏" (gāo) respectively, following the standard transmitted edition of the Ling Shu. The translation below is based on these corrections.

Overall Paraphrase

The Yellow Emperor asked Qi Bo, saying: When water and grain enter from the mouth and are transported to the stomach and intestines, the fluids they transform can be roughly divided into five kinds. When the weather is cold and clothing is thin, much transforms into urine and qi (vapor). When the weather is hot and clothing is thick, much transforms into sweat. In times of grief, when the qi mechanism conjoins and amasses, much transforms into tears. When there is heat internally and the stomach qi becomes lax, much transforms into saliva. If pathogenic influences disturb internally and the qi mechanism becomes blocked and unable to move, fluid accumulation will give rise to water swelling (edema). I understand these phenomena, yet I do not understand how they come about—I wish to hear the principle behind them.

Qi Bo said: Water and grain both enter from the mouth; the five flavors each return to their corresponding "seas" (such as the sea of qi, sea of blood, sea of water and grain, and sea of marrow), and the fluids each travel along their own pathways. The yang qi emitted by the Triple Burner (the channel system through which fluids and qi move) warms the flesh and enriches the skin. That which is clear and thin and spreads over the surface is called "jin" (thin fluid); that which flows slowly and moistens the joints, marrow, and brain is called "ye" (thick fluid). When the weather is hot and clothing is thick, the interstices (the gaps in the skin and flesh) open, therefore sweating occurs. When cold pathogen lodges between the sinews and flesh, fluids gather into foam-like matter, producing pain. When the weather is cold, the interstices close, fluids are not easily distributed outward as vapor, and the fluid descends and is retained in the bladder, forming urine and qi.

Among the five viscera and six bowels, the heart is the sovereign; the ears govern hearing, the eyes govern vision, the lungs are like the prime minister, the liver like the general, the spleen governs protection, and the kidneys govern the exterior. The fluids of the five viscera and six bowels all ascend and infuse upward into the eyes. When the heart is grieved, the qi mechanism conjoins, and the heart ties (the connecting cords surrounding the heart) become taut. When the heart ties are taut, the lung lobes are drawn upward. When the lung lobes are drawn upward, fluids are forced to spill upward and outward. As the heart ties and lungs cannot remain continuously raised, alternating between rising and descending, this causes coughing and tear production. When there is heat internally, transformation in the stomach is accelerated, and the intestinal parasites stir and move up and down, causing the stomach and intestines to expand and the stomach body to become lax. When the stomach body is lax, the qi mechanism counterflows, and therefore saliva flows outward.

The fluids transformed from the five grains, when harmonized, become a paste-like essence that deeply penetrates into the bone spaces, supplements the brain and marrow, and flows downward to the inner aspect of the thighs. If yin and yang become disharmonized, this causes fluid to spill outward and descend to the genitals. Both marrow and fluids diminish and flow downward; when downward flow is excessive, deficiency results. Deficiency manifests as lower back and spinal pain and soreness of the legs. If the pathways of yin and yang qi become blocked, the Four Seas (the seas of qi, blood, water-grain, and marrow) become obstructed, the Triple Burner can no longer disperse and drain, and fluids cannot transform properly. Water and grain converge together and enter the stomach and intestines; after reaching the ileum they are separated, becoming retained in the lower burner. Unable to permeate into the bladder, this results in lower burner fullness, with water fluid overflowing and creating water swelling. This is the general principle of how fluids are divided into five kinds and how they follow or diverge from their proper courses.

🧠 Deep Understanding

Core Principles 💡

• Five fluids share the same origin but have different pathways: Though sweat, urine, qi, tears, and saliva manifest differently, they all derive from fluids transformed from water and grain—the difference in outcome depends on cold/heat, emotional state, and visceral condition.
• Triple Burner qi transformation is the central hub of fluid metabolism: Sweating depends on opening and closing of the interstices; urine formation depends on bladder qi transformation; water swelling results from the Triple Burner failing to drain and fluid not transforming. This embodies the TCM principle "where qi moves, water moves; where qi is blocked, water stagnates."
• Emotion–viscera–fluid linkage: Grief in the heart causes the heart ties to become taut, the lungs to rise, and fluids to spill upward, explaining "coughing with tearing." This demonstrates how emotion affects bodily fluid distribution through the visceral qi mechanism.
• The view of normalcy and disorder: The normal distribution of fluids is considered "following their course"; the abnormal accumulation, excessive outward discharge, or excessive downward flow resulting from cold, heat, emotion, or pathogen is considered "disorder."

Modern Perspective 🌟

• Sweating and urination are indeed regulated by temperature, clothing, hydration status, and neuro-endocrine regulation. In hot environments, more sweating occurs; in cold weather, urine output relatively increases—this aligns with the classical observations of "sweating when weather is hot and clothing is thick" and "urine when weather is cold."
• Tear production during grief and during coughing can be explained through emotional centers, autonomic nervous system, and lacrimal reflex pathways. The ancient explanation of "heart ties taut—lung lobes rising—fluids spilling upward" is a systemic functional description rather than an anatomical account.
• "Water swelling" can be understood as fullness and edema resulting from disorders of fluid metabolism. Modern medicine views edema as related to multiple factors such as hydrostatic pressure, colloid osmotic pressure, lymphatic return, and renal function; the ancient formulation uses "Triple Burner not discharging" and "Four Seas obstructed" as a holistic summary.
• Limitations: "Parasites stirring up and down" was an empirical hypothesis ancients used to connect gastrointestinal abnormalities with parasite activity; it cannot serve as a modern diagnostic basis. Additionally, the "Four Seas" and "Triple Burner" are not physical anatomical organs and should be understood from a functional model perspective.

Health & Lifestyle Insights ⚡

• 🌡️ Appropriate warmth and coolness: Adjust clothing according to temperature to avoid prolonged exposure to excessive heat or cold, helping sweat and urine regulation function normally.
• 🧘 Emotional balance: Avoid prolonged excessive grief or worry; reduce intense emotional fluctuations that disturb qi movement and fluid dynamics.
• 🍵 Moderate diet: Avoid overeating and excessive consumption of raw, cold, greasy, or spicy foods; protect the stomach and spleen's ability to transform fluids.
• 🚶 Moderate activity: Avoid prolonged sitting or lying to keep qi flowing and support proper fluid movement.
• These are general lifestyle insights and do not address any specific illness.

📚 Related Knowledge

• Related Concepts: Jin-Ye (fluids), Triple Burner (San Jiao), Four Seas, Qi Transformation, Water Swelling (edema)
• Further Reading:
  • Su Wen · Channels and Vessels Theory (§Pî Jīng Mài Bié Lùn): "When drink enters the stomach, the essence spreads freely, ascends to be transported to the spleen, and the spleen's qi disperses the essence, sending it upward and returning it to the lungs, which regulates the water channels and sends it down to the bladder."
  • Ling Shu · Resolving Qi (§Jué Qì): "When the interstices release and perspiration flows freely at the surface, penetrate — this is called to describe (jin) whenever an unobstructed perspiration occurs in bright granular and slow-diffusion form... supplementing and benefiting brain marrow; when skin glistens with moistening (ye) — this belongs to evening state differences."
  • Ling Shu · On Seas (§Hǎi Lùn): "Humans have a sea of marrow, a sea of blood, a sea of qi, and a sea of water and grain."
  • Ling Shu · Root Foundations of Point Selection (§Běn Shū): "The Triple Burner is also the organ of draining channels; when the fluid routes pass is where "Cô in the middle drains there,\ aligned outwardly between abdomen."`

Footnote: This content is based on classical Chinese medical classics and is provided for traditional culture study and research only. It does not constitute any medical diagnosis, prescription, or treatment advice. Please seek professional medical attention in a timely manner should health issues arise.