Pink is a normal and healthy colour.
A Pale tongue indicates Qi and blood deficiency or that you are deficient in Yang energy. You might appear pallid, tire easily, feel breathless or experience cold limbs.
A Purple tongue may indicate Qi stagnation and blood stasis. You might experience sharp and persistent pains or lumps in the body.
A Red tongue indicates excess heat in the body or Yin deficiency. You might feel feverish, restless and prefer cold drinks. Other symptoms may include a dry throat and rapid pulse.
A Dark Red tongue indicates intensive internal heat or fire syndrome due to Yin deficiency. Symptoms may include fevers, constipation, dry mouth, a strong and rapid pulse, as well as night sweating.
More Tongue Characteristics
Deep cracks on the tongue indicate dryness that may be caused by excess pathogenic heat or Yin deficiency. On the other hand, you may be one of those born with light cracks. Such cracks are unrelated to health.
Teeth marks suggest that there is a Spleen-deficiency or accumulation of water-dampness in the body. These imbalances in the body lead to an enlarged tongue, which lets the teeth make imprints on the tongue more easily. The extent of the teeth marks—slight to severe—indicates the seriousness of the condition.