Bitter mouth is one of the manifestations of liver fire, liver fire will also be accompanied by headache, dizziness, eye redness and swelling pain, irritability, burning pain in the ribs, tinnitus like tide and other symptoms. Liver fire is mostly caused by Qi depression and fire, which is caused by the upward reversal of Qi fire. Fire inflammation, liver fire attack on the head and eyes, so the head swelling and pain, dizziness, eye swelling and pain, bitter mouth and dry throat; liver in the Zhi for anger, liver fire, so irritability; liver fire, burned and liver, so burning pain in the ribs. In addition, the liver fire through the bile meridian congestion in the ear, so tinnitus, characterized by sudden onset, sound like a tide, press the unabated; liver fire burns the blood, can be seen in the vomiting of blood, epistaxis; urine yellow, constipation, tongue red, moss yellow, pulse stringy for the liver fire within the phenomenon. There may also be other causes of bitter mouth, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then standardized treatment.