Traditional Chinese Medicine: Tongue Body Examination and Diagnosis

Overview of Tongue Body Examination

Tongue examination is a primary diagnostic tool in Traditional Chinese Medicine (TCM). When examining the tongue body, the practitioner focuses on three primary clinical indicators:

  • Form: This refers to the physical shape and texture of the tongue, including whether it is Enlarged, Shrunken, or Fissured.
  • Color: The actual hue of the tongue tissue, ranging from Pale and Red to Crimson or Blue.
  • Bearing: This refers to abnormalities in tongue motility, or how the tongue moves and is held within the mouth.

Tongue Forms (Shé Zhì)

Enlarged (Shé Pàng Dà)

An enlarged tongue is typically characterized by an increase in the volume of the tongue body.

  • Qi Deficiency or Yang Deficiency: Suggested if the tongue body is Pale and the coat is Moist and White.
  • Water-Damp: Indicated by the overall swelling of the tongue body.
  • Dampness or Damp Heat: Indicated when the tongue is Enlarged and accompanied by a SHINY coat.

Swollen (Zhŏng) vs. Enlarged (Pàng Dà)

It is critical to distinguish between a "Swollen" tongue and an "Enlarged" tongue in clinical practice:

  • Swollen (Zhŏng): These tongues are engorged with blood. This typically signifies intense Heat Evil or the Up-flaming of Heart Fire, resulting in a Red, Sore, and Swollen presentation.
  • Enlarged (Pàng Dà): These tongues are edematous rather than engorged with blood. They are usually associated with deficiency or dampness.

Shrunken (Shé Shòu Biĕ)

A shrunken tongue is smaller or thinner than a normal tongue body.

  • Shrunken and Pale: Indicates Qi and Yin Deficiency or Qi and Blood Deficiency.
  • Shrunken and Red: Indicates Yin-Liquid (Jin) Deficiency or damage caused by the Humors of the Body.
  • Shrunken, Crimson, and DRY: Indicates severe damage to Yin Humor by Exuberant Heat.

Red Speckles and Prickles (Hóng Máng Cì)

  • Definition: These refer to an increase in the size and/or number of the fungiform papillae on the tongue surface.
  • Clinical Significance: Generally indicates Exuberant Heat. These are common in febrile diseases and are specifically seen when there are maculopapular eruptions.

Fissures (Shé Liè)

Fissures involve cracks or grooves on the tongue surface. The underlying cause is determined by the color of the tongue:

  • Fissures on a Red Tongue: Indicates Exuberant Heat damaging fluids or Yin.
  • Fissures on a Pale Tongue: Indicates Qi and Blood Deficiency or damage to Qi and Yin.
  • Longitudinal Fissures: In some cases, there may be only a single longitudinal fissure present.

Mirror Tongue (Jìng Miàn Shé)

Mirror tongues are completely smooth without a coat, appearing like a piece of glass or a mirror.

  • General Implication: Indicates Yin Humor Depletion.
  • Mirror Red or Mirror Crimson: Both indicate damage to Yin by Intense Heat.
  • Mirror Pale: Indicates damage to both Qi and Yin.

Tongue Body Colors (Shé Sè)

Normal and Pale Colors

  • Pale Red (Shé Dàn Hóng): This is considered the "pink" or normal tongue color.
  • Pale (Shé Dàn):
    • Indicates Yang Qi Deficiency if the tongue is Pale, Moist, and Enlarged.
    • Indicates Deficiency of Qi and Blood generally.

Red and Crimson Colors

  • Red Body (Shé Hóng): Typically indicates Heat. The specific type of Heat depends on the coat and the specific shade of red.
    • Red with Yellow Coat: Indicates Excess Heat.
    • Red with Thin White Coat: Indicates Damage to Yin.
  • Crimson Tongue Body (Shé Jiàng): A deeper, darker red than a standard red tongue.
    • Indicates Heat in the Ying (Nutritive) or Blood Aspects.
    • Indicates Effulgent Yin Deficiency Fire.
  • Red Tongue Tip: Often occurs with symptoms such as vexation, insomnia, and palpitations. This indicates Up-flaming of Heart Fire. The specific type of Heart Fire depends on other tongue features.
    • Red Tip & Yellow Fur: Hyperactive Heart Fire.
    • Red Tip & Mirror Red Body: Indicates Heart-Kidney Non-Interaction (noted as a severe type of insomnia sign).
  • Red or Crimson Shrunken Tongue: Indicates Effulgent Yin Deficiency Fire or Heat in the Blood Aspect with Damage to Yin.

Bluish and Purple Colors

  • Bluish (Shé Qīng) or Purple (Shé Zĭ): Generally indicates impaired flow of Qi and Blood (Qi Stagnation and/or Blood Stasis).
  • Purple Specifics: Specifically points to Blood Stasis. Clinically, a very dark or purple tongue may suggest a serious humor or cancer development requiring a doctor's referral.
  • Purple Macules: Indicate Localized Blood Stasis.

Bearing of the Tongue (Motility)

Tongue bearings refer to abnormalities in how the tongue moves or is positioned.

Stiff Tongue (Shé Qiáng)

  • Description: The tongue is difficult to move and causes difficulty in speaking; however, the tongue may still be extended.
  • TCM Indications:
    • Heat Entering the Pericardium.
    • Phlegm Confounding the Orifices of the Heart.
    • Phlegm Obstructing the Network (Luò) Vessels.
    • Liver Wind Stirring Internally (a type of wind strike affecting tongue, eyes, or face).
  • Biomedical Correlation: Occurs in various diseases of the central nervous system.

Limp Tongue (Shé Wĕi)

  • Description: There is difficulty extending the tongue, but unlike the stiff tongue, there is NO stiffness and NO impairment of speech.
  • TCM Indications:
    • Limp Pale Tongue: Qi and Blood Deficiency.
    • Limp Red Tongue: Intense Heat or Yin Humor Depletion.
  • Biomedical Correlation: Neurological disorders or lesions of the lingual muscle.

Contracted Tongue (Shé Suō)

  • Description: The tongue is visibly tightened and withdrawn into the mouth; it cannot be extended. This is considered a critical sign in most cases.
  • TCM Indications:
    • Contracted Red Tongue: Damage to Yin by Extreme Heat.
    • Contracted Pale Tongue: Yang Qi Desertion.

Deviating Tongue (Shé Piān)

  • Description: The tongue curves to one side when extended.
  • TCM Indications: Wind Strike or Liver Wind Stirring Internally.
  • Biomedical Correlation: Common in strokes.

Trembling Tongue (Shé Chàn)

  • Description: Constant small movements or quivering of the tongue body.
  • TCM Indications:
    • Trembling Red or Deep Red: Ascending Hyperactive Liver Yang or Internal Wind stirred by Exuberant Heat.
    • Trembling Pale: Qi Deficiency.
  • Biomedical Correlation: High fevers, hyperthyroidism, hypertension, and various neurological disorders.

Protrusion and Worrying (Tŭ Nòng Shé)

  • Description: The tongue moves in a circular motion, extends back and forth from the mouth (protrusion), or licks the upper and lower corners of the mouth (worrying/agitation).
  • TCM Indications in Children:
    • Internal Wind about to Stir.
    • Developmental disability due to Former Heaven (Pre-Natal) Essence Insufficiency.