TCM · Tongue · Pulse · Diagnosis · Four Examinations

Tongue & Pulse Diagnosis

Two windows into the body's inner state — available without a single blood test, X-ray or scan. The tongue and pulse have been read by TCM practitioners for over two thousand years, and the information they yield, in skilled hands, remains among the most sophisticated diagnostic tools available in any medical tradition.

The Four Examinations: TCM diagnosis uses four methods — Looking (望 Wàng), Listening and Smelling (聞 Wén), Asking (問 Wèn), and Touching (切 Qiē). Tongue diagnosis is the primary tool of Looking; pulse diagnosis is the primary tool of Touching. Together they give the practitioner a complete picture of the patient's internal state that no single examination method can provide alone.

Section 01

Tongue Diagnosis

The tongue is a microcosm of the body — its body colour, shape, moisture and coating each reflect specific aspects of the body's internal state. Unlike the pulse, which can change rapidly in response to temporary factors, the tongue reflects the body's more chronic, constitutional condition. It is the single most reliable indicator of the patient's overall pattern in TCM diagnosis.

The tongue is examined under natural light if possible, with the patient relaxed (the tongue should not be stuck out forcefully — this distorts the colour). The practitioner notes five primary features: the body colour (reflects Blood and organ function), the body shape (reflects fluid status and Qi), the moisture level (reflects fluid balance), the coating (reflects digestive function and pathogenic factors), and any cracks, spots or geographic changes.

Tongue Zone Map

Tip

Heart and Lung — redness or ulcers at the tip indicate Heart Fire or emotional heat. The very tip reflects the Heart's Shen.

Front third

Lung — coating changes here indicate Lung conditions. Redness without coating suggests Lung Yin deficiency.

Centre

Spleen and Stomach — the most clinically important zone. The coating here indicates digestive strength and the presence of pathogenic factors.

Sides

Liver and Gallbladder — red sides indicate Liver Heat or Liver Fire. Pale sides suggest Liver Blood deficiency. Teeth marks on the sides indicate Spleen Qi deficiency.

Root

Kidney — thick coating at the root indicates Kidney pathology or lower burner damp-heat. Loss of coating at the root reflects Kidney Yin deficiency.

Section 02

Reading the Tongue

The tongue is assessed across five primary dimensions. A skilled practitioner reads all five simultaneously — the combination of features tells a more complete story than any single feature alone.

Pale Body

Paler than normal pink

The most common tongue finding. Indicates Blood deficiency, Yang deficiency or Cold. The paler the tongue, the more deficient the Blood or Yang.

Indicates: Blood/Qi/Yang deficiency · Anaemia · Fatigue · Cold constitution

Red Body

Redder than normal

Indicates Heat — either Full Heat (excess Yang or pathogenic heat) or Empty Heat (Yin deficiency allowing Yang to rise unchecked). Location of the redness indicates which organ is affected.

Indicates: Heat pattern · Inflammation · Infection · Yin deficiency heat

Purple/Dark Body

Purple, bluish or dark

Indicates Blood stasis — the blood is not circulating freely. Can be the result of cold (pale purple) or heat (dark red-purple). One of the most significant tongue findings — Blood stasis underlies chronic pain, cardiovascular disease and many cancer patterns.

Indicates: Blood stasis · Chronic pain · Cardiovascular risk · Severe cold or heat

Swollen/Puffy Body

Larger than normal, filling the mouth

Indicates Dampness or Phlegm — the body's tissues are holding excess fluid. Often seen with Spleen Qi deficiency. Teeth marks on the sides of a swollen tongue confirm the Spleen is too weak to process fluids adequately.

Indicates: Dampness · Phlegm · Spleen Qi deficiency · Fluid retention

Thin/Narrow Body

Smaller than normal, thin

Indicates deficiency of Blood or Yin — the tongue has lost its substance. A thin, dry tongue suggests Yin deficiency with dryness. A thin, pale tongue suggests Blood deficiency.

Indicates: Blood deficiency · Yin deficiency · Chronic illness · Nutritional depletion

White Coating

Normal to thick white

A thin white coating is normal — the Stomach's digestive activity. A thick white coating indicates Cold or Dampness. A white coating that is greasy indicates Damp-Phlegm in the middle burner. No coating at all indicates Yin or Stomach Qi deficiency.

Normal thin: healthy · Thick: Cold/Damp · Greasy: Phlegm · Absent: Yin deficiency

Yellow Coating

Yellow, from pale to dark

Indicates Heat — the coating has been transformed by heat in the body. The darker and thicker the yellow coating, the more severe the Heat. A yellow greasy coating indicates Damp-Heat — one of the most common patterns in inflammatory conditions.

Indicates: Heat pattern · Infection · Inflammation · Damp-Heat (greasy yellow)

Cracks & Features

Fissures, red dots, geographic patches

A midline crack reaching the tip indicates Heart and Spleen Qi deficiency. Horizontal cracks across the body suggest chronic Stomach Yin deficiency. Red dots (petechiae) indicate Blood Heat or stasis. Geographic tongue (shifting patches without coating) reflects Stomach Yin deficiency.

Midline crack: Heart/Spleen · Horizontal cracks: Stomach Yin · Red dots: Blood Heat

Section 03

Pulse Diagnosis

Pulse diagnosis (切診 — Qiē Zhěn) is the most sophisticated diagnostic tool in TCM and the one that takes the longest to master. Where the tongue gives a reliable picture of the body's chronic pattern, the pulse gives information about the present moment — what is happening now, how the body is responding, and often information too subtle or too recent to have appeared on the tongue yet.

The pulse is felt at the radial artery of both wrists, at three positions on each wrist — Cun (inch), Guan (bar) and Chi (cubit) — and at two depths: superficial (Wei level) and deep (Li level). Each position and depth corresponds to a specific organ pair. The practitioner uses the index, middle and ring finger together, applying graduated pressure to move from superficial to deep.

Left Wrist Yin side

Superficial

Deep

Cun 寸

Small Intestine

Heart

Guan 關

Gallbladder

Liver

Chi 尺

Bladder

Kidney Yin

Right Wrist Yang side

Superficial

Deep

Cun 寸

Large Intestine

Lung

Guan 關

Stomach

Spleen

Chi 尺

Triple Burner

Kidney Yang

A healthy pulse at rest is approximately 60–80 beats per minute, regular, of moderate strength, felt at both superficial and deep levels without requiring excessive pressure, and with a quality described in classical texts as "like a stone wrapped in silk" — firm but smooth. Any deviation from this in rate, rhythm, strength, depth, width or quality indicates a pathological condition in the corresponding organ or system.

Section 04

The 28 Classical Pulse Qualities

The classical pulse system identifies 28 distinct qualities — each describing a specific aspect of the pulse's character. In practice, the most clinically important are the following. Pulses are rarely pure — most present as combinations of two or three qualities that together describe the pattern more precisely than any single quality alone.

Pulse Quality	Chinese	Character	Indicates
Floating	浮 Fú	Felt easily at superficial level; disappears with pressure	Exterior condition — early-stage pathogenic invasion. Also Yin deficiency (floating because there is nothing anchoring below)
Sinking/Deep	沉 Chén	Only felt with firm pressure at deep level	Interior condition — pathology is in the organs or deep tissues. Can indicate Cold, deficiency or internal excess
Slow	迟 Chí	Fewer than 60 beats per minute	Cold — either Cold pathogen or Yang deficiency. The body's metabolic activity is slowed
Rapid	数 Shuò	More than 90 beats per minute	Heat — Full Heat (excess) or Empty Heat (Yin deficiency). The faster, the more severe the heat
Wiry	弦 Xián	Taut, like a guitar string — hard, linear, ungiving	Liver/Gallbladder pattern — Liver Qi stagnation, Liver Yang rising, pain, stress. The most common pulse in modern patients
Slippery	滑 Huá	Smooth, round, flowing — "like pearls rolling on a plate"	Dampness, Phlegm, food retention — also normal in pregnancy and in healthy individuals with abundant Qi
Thin/Thready	细 Xì	Very fine, like a thread — present but barely perceptible	Blood deficiency, Yin deficiency — insufficient substance to fill the vessels. Common in the chronically ill, overworked or nutritionally depleted
Full/Surging	洪 Hóng	Large, forceful, like a wave — strong on both arrival and departure	Excess Heat — abundant Qi and Blood with strong pathogenic Heat. Classic pulse of high fever
Empty/Hollow	虚 Xū	Soft and large but without strength — like pressing on a bag of water	Qi deficiency — insufficient Qi to push the blood forcefully through the vessels
Choppy/Rough	涩 Sè	Uneven, hesitant, like a blunt knife scraping bamboo	Blood deficiency or Blood stasis — the blood is not flowing smoothly, either from deficiency of substance or obstruction of flow
Knotted	结 Jié	Slow with irregular pauses	Yin excess with Qi/Blood stagnation — Cold obstructing circulation. Can indicate cardiac arrhythmia
Hasty	促 Cù	Rapid with irregular pauses	Yang excess with Qi/Blood stagnation — Heat obstructing circulation. Also seen in cardiac arrhythmias

The pulse has no colour and cannot be seen. It has no sound and cannot be heard. Only the trained finger can perceive it — and only after years of practice will the finger know what it perceives.

— Paraphrase of classical teaching on pulse diagnosis, attributed to various masters

Pulse diagnosis takes years to learn — most TCM schools dedicate multiple clinical years to developing the tactile sensitivity required. The 28 classical pulse qualities are not abstract categories but specific, reproducible physical sensations in the practitioner's fingertips. Like wine tasting or musical ear training, it is a perceptual skill that develops with guided practice, not from reading about it. What can be said without years of training: feeling your own pulse regularly at the three wrist positions and noticing changes over time — morning versus evening, stressed versus rested, before and after a meal — develops a useful baseline awareness of your body's immediate functional state.

Connections

Qi & Vital Substances Meridians & Acupoints Five Elements in the Body Yin & Yang in Health Acupuncture Chinese Herbal Medicine Iridology Functional Medicine

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