Reading Temperament from the Tongue
Introduction
In modern medicine the tongue is considered one of the most important clinical indicators for diagnosing systemic diseases, nutritional deficiencies and psychosomatic (mind–body) disorders. This is thanks to its rich network of blood vessels, its nerve endings (cranial nerves) and its mucosa, whose cells renew quickly.
In traditional systems of medicine, the tongue is seen as a map of the body’s inner world. It is one of the most important and practical tools for understanding temperament, imbalances and the state of the four humours (blood, bile, phlegm and black bile).
Reading temperament from the tongue (the traditional view)
In traditional medicine, the tongue’s:
- colour
- shape
- moisture
- coating
give important information about the body’s inner state. Below, the features of the tongue are described for each of the four basic temperaments.
1. Excess phlegm (cold and moist)
Pathophysiology: metabolism slows down and fluid builds up in the body.
What the tongue looks like:
- Large, wide and swollen
- Very moist
- A thick white coating
- Tooth marks on the edges (especially with digestive problems and weakness)
Clinical reading: this shows that the digestive system is weak and the body cannot get rid of excess moisture.
2. Excess bile (hot and dry)
Pathophysiology: more heat in the liver and stomach, with dryness dominating.
What the tongue looks like:
- Thinner than normal
- A yellow coating on a red base
- Dry and rough
Important: with digestive, liver or gallbladder problems, tooth marks can appear on the edges of the tongue even in people with a bilious temperament.
3. Excess black bile (cold and dry)
Pathophysiology: circulation slows, the blood thickens and the tissues dry out.
What the tongue looks like:
- Thin, wrinkled and dark (purplish or bluish)
- Deep, long cracks
- Dark, prominent veins under the tongue
Important: because of weak digestion, these people can also have tooth marks on the edges of the tongue.
4. Excess blood (hot and moist)
Pathophysiology: the vessels are full and heat increases.
What the tongue looks like:
- Large and full
- Red all over
- Moist
- Sometimes an inflamed-looking surface
The secret of the scalloped tongue
Many people think that tooth marks on the edges of the tongue belong only to the phlegmatic temperament. In fact they can appear with excess bile, black bile or blood, and even on thin tongues.
What is the real cause?
Tooth marks on the tongue usually point to:
- Weak digestion
- Liver and gallbladder problems
- Poor absorption of nutrients (malabsorption)
- Fluid retention for metabolic reasons
The link with the liver and bile
- A liver problem → toxins are not cleared
- A bile problem → fats are not digested
The result: waste builds up in the body, the tongue’s structure changes, and the tongue presses against the teeth, leaving marks.
Conclusion
The tongue is a living indicator of health:
- In modern medicine: a sign of hidden illness, anaemia and infection
- In psychoneurology: a reflection of stress and nervous system imbalance
- In traditional medicine: a sign of temperament and of the balance of the humours
The golden rule
Reading temperament from the tongue alone is wrong. For an accurate reading, the tongue must always be assessed together with:
- Digestion
- Sleep quality
- Appetite
- Mental and emotional state
Sources
- Walker HK, Hall WD, Hurst JW. Clinical Methods. 3rd ed.
- Bickley LS. Bates’ Guide to Physical Examination. 12th ed.
- Kumar V, Abbas AK, Aster JC. Robbins Basic Pathology.
- Porter RS, Kaplan JL. The Merck Manual.
- Epel ES, Blackburn EH, Lin J, et al. Proc Natl Acad Sci U S A. 2004.
- Kaptchuk TJ. The Web That Has No Weaver.
- Ibn Sina (Avicenna). The Canon of Medicine.
- Chashti MN. Exposition of the Canon of Medicine.
- Gholizadeh F. Principles of Traditional Medicine.
Read more
The Body Signs series looks at the tongue in more detail: what tooth marks on the tongue tell us. To find your own temperament, take the free temperament test.
This article is for information only and is based on traditional medical sources and general health knowledge. It is not a medical diagnosis, treatment or prescription and does not replace an examination by a doctor. If you have a health complaint, take regular medication, are pregnant, or are considering this for a child, consult your doctor before applying anything. Herbal products can interact with medicines.
