A black tongue may be stained, or it may be related to heat and cold.
1. Dyeing: Black dyeing refers to the fact that after consuming foods such as mulberries, olives, prunes, etc., the tongue coating will be dyed black, and then it will gradually return to its original color, and the dyeing has nothing to do with the disease.
2. Extreme heat and dryness: According to traditional Chinese medicine, the tongue moss is produced by the stomach qi, and the normal tongue moss should be thin white moss. When the body heat, heat from the fire, will hurt the fluid, the tongue moss will gradually turn black, manifested in the tongue moss burnt black dry, may be accompanied by constipation, dry mouth and bitter symptoms.
3. Cold evil exuberance: cold for the yin evil, the body of cold evil exuberance will be manifested as lubrication of the black moss, and may be accompanied by cold limbs, abdominal cold pain, diet does not melt and other symptoms.
Therefore, when you find that the tongue becomes black, you can first drink water or brush your teeth in order to exclude the stained moss, if the black moss caused by disease, you should consult a Chinese medicine practitioner for diagnosis and treatment in a timely manner.