Bitter mouth and excessive phlegm may be caused by internal disturbance of phlegm-heat or liver-fire in the lungs. Internal disturbance of phlegm and fire (the body is disturbed by phlegm and fire) means that the gallbladder qi is not smooth, the qi is depressed and turns into fire, the stomach is violated to produce phlegm, and phlegm and fire go up to the lungs. Gallbladder fire burns internally, so the mouth is bitter; phlegm fire upward, obstructing the lung qi to declare and descend, water and dampness can not be declared and dissipated, transformed into phlegm, so phlegm is more. Liver fire against the lungs is mostly caused by emotional upset (emotional upset), and the basic pathogenesis is that depressed anger injures the liver, liver qi stagnation (poor qi and blood transportation in the liver, emotional depression), qi stagnation turns into fire, liver fire goes upward, and the lungs lose their propagation and descension. Liver qi depression and fire, so bitter mouth; liver fire offending the lung, the lung loss of declination, resulting in water can not be dispersed, turned into phlegm, so phlegm. There are many other causes of bitter mouth and phlegm, it is recommended to go to the hospital in time to clarify the cause of the disease and follow the doctor’s advice for further treatment.