Getting up every morning with a bitter and foul-smelling mouth may be caused by overeating, manifestations of liver disease, oral diseases and other reasons. 1. Overeating: Usually morning breath comes from the tongue, and a normal tongue should be red and moist. If the patient’s tongue is red, thickened and sticky, it means that the body is stagnant with dampness and heat. Usually, it is caused by the patient’s over-eating and the accumulation of nutrients in the body in excess of the body’s needs. 2. Liver disease manifestations: generally suffer from hepatitis, liver disease, cholecystitis and other liver and gallbladder diseases, due to the poor function of the gallbladder, bile drainage abnormalities, easy to get up every morning in the mouth with a bitter odor. 3. Oral disease: general burning mouth syndrome, oral candida infection and other patients may lead to abnormal taste in the mouth, which is also a common cause of the bitter taste in the mouth every morning. There are many other reasons for the bitter odor in the mouth every morning, it is recommended that the patient actively seek medical attention to clarify the cause of the disease and then carry out regular treatment.