White tongue and bad breath may be liver fire, but also may be stomach fire, need to be combined with other symptoms to identify the judgment. 1. According to traditional Chinese medicine, tongue coating is generated by the stomach qi, when there is stagnation in the stomach, there will be white tongue coating performance, stagnation over time and heat will be born stomach fire. Under normal circumstances, the spleen is the main ascending, the stomach is the main descending, the stomach qi should be downward, but when there is stomach fire, the stomach qi will rise, there will be bad breath symptoms, and will be accompanied by overeating and easy to eat, dry vomiting and hiccups (hiccups), stomach and epigastric pain, constipation and other symptoms. 2. When the liver fire is strong, it will hurt the fluid, the symptoms of white tongue coating dry, liver fire inflammation, steaming in the mouth, will lead to dry mouth, bitter mouth, bad breath symptoms, in addition, liver fire is accompanied by dizziness, tinnitus, red face and eyes, irritability and other symptoms. Therefore, it is difficult to identify stomach fire and liver fire only by the white tongue coating and bad breath, and it is necessary to combine with other symptoms for identification.