Black tongue coating on both sides may be caused by diet, or it may be caused by liver qi stagnation, liver stagnation and blood stasis.
If you eat chocolate, mulberry and other foods, you may have a black tongue, this time, usually by gargling and cleaning, the black tongue can be eliminated.
Liver-qi stagnation caused by black tongue coating on both sides, may also appear mental depression, irritability, coercive and rib distension, or tingling pain, breast swelling, chest tightness and discomfort, like to sigh, epigastric (gastric and abdominal) distension and pain, nausea (lack of appetite, reduced food intake) belching (belch), or pharyngeal blocking sensation and so on.
Liver depression and blood stasis caused by black tongue coating on both sides, may also appear depression, two hypochondriac distension or tingling, or hypochondriac lumps, tongue purple or dark or have spots and other symptoms.
If the black tongue is accompanied by other discomforts, it is recommended to consult a doctor in time to identify the cause and then carry out targeted treatment.