# Why Can TCM Doctors Tell Where You're Deficient Just by Looking at Your Face? Facial Color Is the Organs' "Display Screen"
A Question
Have you ever noticed that some people's faces are as rosy as apples, some are sallow and emaciated like underripe bananas, and some are bluish as if they've been poisoned? Have you ever noticed that after pulling an all-nighter, the next day your friends say, "You look terrible"—you look in the mirror, and indeed you're yellowish and dull, but you can't quite put your finger on what's wrong. Even more surprising, TCM says, "A pale complexion indicates qi deficiency," while Western medicine says, "Could be anemia"—you ask, "Who's right?"
Have you ever had this experience? When you're angry, your face flushes red in an instant, and your whole body feels hot. After a while, the anger subsides, and your complexion returns to normal. You ask, "Why does facial color change with emotion?" TCM says, "Anger causes qi to rise upward, and qi and blood surge to the face." Western medicine says, "The sympathetic nervous system is excited, and blood vessels dilate." Are the two statements saying the same thing?
Here's another question: all your physical exam indicators are normal, but the TCM doctor takes one look at your face and says, "Spleen deficiency," "liver qi stagnation," or "kidney deficiency." You ask, "How does the doctor know without even running lab tests?" TCM says, "Knowing by inspection is divine" (望而知之谓之神)—looking at the face reveals the state of your internal organs. You think to yourself, "That sounds way too mystical."
So, what exactly is "se" (色 / facial color)?
The Traditional Chinese Explanation
The concept of "se" ranks first among the TCM diagnostic methods. The Yellow Emperor's Inner Canon (《黄帝内经》) says: "Knowing by inspection is divine, knowing by listening is sagely, knowing by inquiry is skillful, and knowing by touch is clever." "Wang" (望 / inspection) means looking—looking at facial color, tongue appearance, and body posture. Among these, facial color is the most direct "health display screen."
The ancients observed that a person's facial color changes with their physical state. A healthy person is "reddish-yellow faintly visible, bright and moist, reserved" (红黄隐隐，明润含蓄)—with a rosy and lustrous complexion. An unhealthy person will show a facial color that leans toward blue, red, yellow, white, or black. The ancients summarized these changes in facial color as the Five-Color Diagnosis (五色诊): blue (青), red (赤), yellow (黄), white (白), and black (黑), corresponding to the five organs: liver, heart, spleen, lung, and kidney.
Blue (Qing) (blue enters the liver) — A bluish facial color, like the color of vegetables. Indicates cold patterns, pain patterns, and blood stasis. The liver governs the free flow of qi; when liver qi stagnates or when cold congeals in the liver channel, qi and blood flow becomes unsmooth, and the face turns blue. For example: when angry, the face turns "iron blue" (脸色铁青); during menstrual pain, the face is "blue-white" (面色青白)—these are all liver issues.
Red (Chi) (red enters the heart) — A red facial color, like the red face of Guan Yu. Indicates heat patterns. The heart governs blood and vessels; in heat patterns, blood vessels dilate and blood flow accelerates, so the face turns red. For example: when you have a fever, your face is flushed red; when angry, you are "red in the face and ears" (面红耳赤); hypertensive patients have a "flushed complexion" (面色潮红)—these are all heat signs of the heart.
Yellow (Huang) (yellow enters the spleen) — A yellow facial color, like yellow earth. Indicates spleen deficiency and damp patterns. The spleen governs transformation and transportation; when the spleen is deficient, water-dampness accumulates internally, and qi and blood production becomes insufficient, resulting in a sallow yellow complexion. For example: people with long-term indigestion have a yellowish complexion; after staying up late, the face is waxy yellow; jaundice patients have a yellow discoloration of the whole body—these are all spleen issues.
White (Bai) (white enters the lung) — A pale facial color, like white paper. Indicates deficiency patterns, cold patterns, and blood loss. The lung governs qi; when qi is deficient, blood cannot rise to nourish the face, and the complexion becomes pale. For example: anemic people have a pale complexion; after massive blood loss, the face is "white as paper" (面白如纸); people with yang deficiency have a "pale and lusterless complexion" (面色晄白)—these are all lung/qi deficiency issues.
Black (Hei) (black enters the kidney) — A black facial color, like coke. Indicates kidney deficiency, water retention, and blood stasis. The kidney governs water; when the kidney is deficient, water metabolism becomes abnormal, and the complexion becomes dark and dull. For example: people who stay up late for a long time have "dark circles under the eyes" (黑眼圈) (kidney deficiency); chronic kidney disease patients have a dark and sallow complexion; elderly people have a "dark and gloomy complexion" (面色晦暗)—these are all kidney issues.
So, when the ancients spoke of "se," it was not merely "color." It was the direct projection of organ qi and blood onto the face—like a mirror reflecting the state of the internal organs. The ancients systematized the changes in facial color through the Five-Color Diagnosis, making it an important basis for diagnosis.
Alright, now let me translate "se" into modern language.
I'm not going to talk about skin pigment cells, hemoglobin spectra, or microcirculation blood vessels. Too complicated. You only need to remember one metaphor:
It's that simple. Your "facial color" is essentially the comprehensive reflection of skin blood circulation, pigment deposition, and metabolic waste—like a computer's display screen, the lights that come on tell you where something is wrong.
Specifically:
What does a "red facial color" correspond to? It corresponds to skin blood vessel dilation and increased blood flow. During emotional excitement or fever, the sympathetic nervous system becomes excited, blood vessels dilate, blood flow increases, and the face turns red. In hypertensive patients, the blood vessels are chronically tense, and the face is "flushed." This is consistent with TCM's "red belongs to the heart, indicating a heat pattern" (赤为心，主热证)—the heart governs blood and vessels, and heat accelerates blood flow.
What does a "pale facial color" correspond to? It corresponds to decreased hemoglobin or blood vessel constriction. In anemia, hemoglobin drops, blood oxygen-carrying capacity decreases, skin color diminishes, and the face appears pale. During shock or cold exposure, blood vessels constrict, blood flow decreases, and the face becomes pale. This is consistent with TCM's "white belongs to the lung, indicating a deficiency pattern" (白为肺，主虚证)—the lung governs qi, and when qi is deficient, blood cannot rise to nourish the face.
What does a "yellow facial color" correspond to? It corresponds to abnormal bilirubin metabolism or carotene deposition. When liver function is abnormal, bilirubin rises, and the skin and sclera turn yellow (jaundice). When spleen deficiency leads to poor digestion, carotene conversion and metabolism slow down, carotene deposits in the skin, and the face turns yellow. This is consistent with TCM's "yellow belongs to the spleen, indicating a damp pattern" (黄为脾，主湿证)—the spleen governs transformation and transportation, and when transformation and transportation are abnormal, damp turbidity accumulates internally.
What does a "blue facial color" correspond to? It corresponds to tissue hypoxia or circulatory disorders. During cold exposure, pain, or blood stasis, peripheral blood vessels constrict or venous return is obstructed, tissues become hypoxic, the amount of reduced hemoglobin in the blood increases, and the skin turns blue-purple. This is consistent with TCM's "blue belongs to the liver, indicating cold/pain/stasis" (青为肝，主寒/痛/瘀)—the liver governs the free flow of qi, and when qi stagnates, blood stasis occurs.
What does a "black facial color" correspond to? It corresponds to pigment deposition or chronic metabolic disorders. During long-term stay-up-late nights and adrenal fatigue, cortisol rhythm is disrupted, melanin deposition increases, and the complexion becomes dark and dull. In chronic kidney disease, metabolic waste accumulates, and the face turns dark and sallow. This is consistent with TCM's "black belongs to the kidney, indicating kidney deficiency" (黑为肾，主肾虚)—the kidney governs water, and when metabolism is abnormal, turbid yin rises upward.
So, "se" is not mysticism. It is a visualized physiological indicator—describing the comprehensive performance of skin blood circulation, pigment metabolism, and endocrine state. The ancients summarized it with the Five-Color Diagnosis; modern people describe it with "microcirculation + hemoglobin + bilirubin + melanin"—they are talking about the same thing.
Real-Life Cases
Four stories to help you instantly understand what "se" is.
Case One: The Waxy Yellow Face After Staying Up Late.
You sleep at 2 a.m. for three consecutive days, and when you get up in the morning and look in the mirror—your face is waxy yellow, like a layer of yellow earth has been applied. Your friend sees you and says, "Why does your complexion look so bad lately?" You go for a physical exam, and your liver function indicators are normal. TCM says: "Spleen deficiency, insufficient qi and blood." You ask, "Why does staying up late cause spleen deficiency?"
The truth: Staying up late disrupts the biological clock, and the liver's detoxification and metabolic functions decline. Bile secretion and excretion rhythms are disrupted, bilirubin metabolism slows down, and it is slightly deposited in the skin, causing the face to turn yellow. At the same time, spleen deficiency leads to a decline in transformation and transportation capacity, and the metabolism of carotene from food slows down, depositing in the stratum corneum. It's not that "the liver is broken"; it's the metabolic rhythm is disrupted, and the skin has become the "display screen" for metabolic waste. TCM says "yellow enters the spleen, and when the spleen is deficient, the face is yellow" (黄色入脾，脾虚则面黄)—precisely describing the metabolic disorder caused by staying up late.
Case Two: "Red in the Face and Ears" When Angry.
You have an argument with your boss, get so angry that your face is flushed red, and the veins on your neck are bulging. After half an hour, you calm down, and your complexion returns to normal. You ask, "Why does anger make the face change color?" Western medicine says: "The sympathetic nervous system is excited, adrenaline is secreted, and blood vessels dilate." TCM says: "Anger causes qi to rise upward, liver qi rebels upward, and qi and blood surge to the face."
The truth: During emotional excitement, the sympathetic nervous system is activated, releasing adrenaline and norepinephrine. The heartbeat accelerates, cardiac output increases, peripheral blood vessels dilate (especially in the face), blood flow increases, and the face turns red. At the same time, breathing quickens, facial muscles tense, and blood flow further increases. It's not "having thin skin"; it's emotions directly control the facial blood vessels through the neuroendocrine system. TCM says "red belongs to the heart, indicating a heat pattern" (赤为心，主热证)—the heart governs blood and vessels, and emotions "heat up" the blood circulation. But the description of "anger causes qi to rise upward" (怒则气上) precisely captures the effect of emotion on facial color.
Case Three: Long-Term Anemia with a Pale Complexion.
You have long been on a crash diet for weight loss, and your menstrual periods are heavy. Recently, you notice your complexion is getting paler and paler, and your lips have no blood color either. You go to the hospital, and your hemoglobin is only 85 (normal is 120–150). Western medicine says: "Iron-deficiency anemia." TCM says: "Dual deficiency of qi and blood, pale and lusterless complexion." You ask, "Why does anemia make the face pale?"
The truth: Hemoglobin is the oxygen-carrying protein in red blood cells, providing the red color to blood. In anemia, hemoglobin decreases, the color of the blood becomes lighter, and the color of the skin and mucosa (including the facial skin) becomes paler accordingly. At the same time, the body reduces peripheral skin blood flow to ensure blood supply to important organs (heart and brain), further aggravating the paleness. It's not "not getting enough sun"; it's the blood "paint" is insufficient, so the skin naturally "fades." TCM says "white enters the lung, indicating a deficiency pattern" (白色入肺，主虚证)—the lung governs qi, and when qi is deficient, blood cannot rise to nourish the face. But the description of "pale and lusterless complexion" (面色晄白) precisely captures the appearance of anemia.
Case Four: The Elderly Person's "Dark and Gloomy Complexion."
Your grandfather is eighty years old, and his face is dark and gloomy, like a layer of gray has been applied. You ask, "Why does a person's face darken as they get old?" Western medicine says: "Chronic metabolic decline, increased melanin deposition, and skin aging." TCM says: "Kidney deficiency, gate of life fire declining, and turbid yin rising upward."
The truth: As age increases, adrenal function declines, cortisol and sex hormone secretion decreases, melanin metabolism slows down, and deposition increases. At the same time, skin collagen decreases, the skin becomes thinner, and vascular transparency changes, making the complexion appear dark and gloomy. Chronic metabolic diseases (such as kidney disease and diabetes) accelerate this process. It's not "not washing the face clean"; it's the metabolic engine is aging, and the skin has become the "aging display screen." TCM says "black enters the kidney, indicating kidney deficiency" (黑色入肾，主肾虚)—the kidney is the root of innate constitution, and when the kidney is deficient, metabolism declines. But the description of "dark and sallow complexion" (面色黧黑) precisely captures the facial characteristics of old age and chronic disease.
Four cases, one underlying logic: Se is the "display screen"—changes in facial color reflect the state of internal organ qi and blood.
Modern Research
Is there scientific research on "se"?
Yes, and a great deal of it. Scientists don't use the term "Five-Color Diagnosis"; they use:
• Correlation studies between facial color and hemoglobin levels. Research has found that facial rosy color is positively correlated with hemoglobin concentration. Among anemic patients (hemoglobin < 100 g/L), 85% show a pale complexion. Facial color is indeed a "visualized indicator" of blood state.
• Skin microcirculation and autonomic nerve function. Facial blood vessels are regulated by the autonomic nervous system (sympathetic and parasympathetic nerves). During emotional excitement, the sympathetic nervous system is excited, facial blood vessels dilate, and the face turns red; during shock or cold exposure, the sympathetic nervous system is excited, blood vessels constrict, and the face turns pale. Changes in facial color directly reflect the neurovascular regulation state.
• Correlation between facial color changes and internal organ diseases. Research has found: among chronic liver disease patients, 80% show a dark and gloomy complexion or jaundice; among chronic kidney disease patients, 70% show a dark and sallow complexion; among long-term adrenal fatigue patients, 60% show a dark complexion. Facial color can indeed serve as an "external indicator" of internal organ diseases.
Practical Methods
Now that you understand "se," how do you look at it?
First, let's dispel a few misconceptions:
• "I was born with fair/dark skin, so facial color is not accurate." Innate skin color is the "base color," and facial color changes are the "overlay colors." Looking at facial color means looking at changes—the difference in the same person's complexion when healthy versus when sick. It's not about comparing with others; it's about comparing with yourself.
• "Facial color diagnosis apps can diagnose diseases." Some apps on the market claim to "take a photo of your face and automatically diagnose." Facial color is just one reference for diagnosis and cannot replace a complete medical examination. Facial color apps may capture color changes, but they cannot determine the cause. It's not "technology replacing doctors"; it's facial color is a clue, not a diagnosis.
Specific methods:
• Morning mirror self-check (best timing). In the morning, just after getting up, before washing your face, applying makeup, or being affected by light, the facial color is closest to its true state. Observe: is the facial color even? Is there any color bias? Are the eyelids yellow? Are the lips pale? Record once a week and compare changes.
• Look at the color of the whites of the eyes (jaundice indicator). The whites of the eyes (sclera) are the most sensitive site for observing jaundice. When liver function is abnormal, bilirubin rises, and the sclera turn yellow first. If the sclera are persistently yellow, check liver function promptly.
• Look at lip color (qi and blood indicator). The lips are richly vascularized, with no stratum corneum blocking the view, making them the most direct window for observing qi and blood. Rosy lip color = sufficient qi and blood; pale lip color = anemia or qi deficiency; purple-dark lip color = blood stasis or hypoxia.
• Compare palms and face (circulation indicator). A healthy person's palms and facial color should be consistent. If the palms are red ("liver palm") while the face is yellow, it may indicate a liver problem. If the palms are pale while the face is red, it may indicate a circulatory abnormality.
• Keep a facial color change diary. Continuously record facial color, sleep, diet, emotions, and symptoms for two weeks. You will discover: after staying up late, the face turns yellow; after getting angry, the face turns red; after fatigue, the face turns white—facial color changes are highly correlated with the body's state. This is your own "health database."
These methods don't require you to believe in TCM. You only need to understand: Se is the "display screen"—observing changes in facial color is observing the body's internal "signal output."
One-Minute Summary
🕐 One Minute to Understand "Se"
Se = The organs' display screen + status indicator light.
The five colors correspond to the five organs: blue enters the liver, red enters the heart, yellow enters the spleen, white enters the lung, and black enters the kidney.
Changes in facial color are a direct reflection of organ qi and blood—it's not about judging beauty or ugliness, it's about judging health status.
Se = skin microcirculation + hemoglobin + bilirubin + melanin.
Red (heat/congestion), white (deficiency-cold/anemia), yellow (dampness/spleen deficiency), blue (cold/pain/stasis), black (kidney deficiency/metabolic decline).
Misconceptions: using innate skin color as an excuse, and blindly trusting facial color diagnosis apps.
Methods: morning self-check, look at the whites of the eyes, look at lip color, compare palms, and keep a change diary.
The ancients called it "Five-Color Diagnosis" (五色诊); modern people call it "skin physiology."
The names are different, but the body knows: the face is the display screen of the internal organs. Where the light comes on, that's where the problem is.
xiaokz · Concept 56
Using the language of modern science to help the world understand traditional Chinese wisdom.
Not mysterious, not superstitious, not dismissive.
Understanding, not just believing.