If you wake up in the morning with bitter mouth, bad breath and cloudy yellow saliva, you should first consider that it is related to poor oral hygiene. Patients who smoke for a long time, do not brush their teeth, and eat a lot of fatty, sweet and thick-tasting food, which leads to bad taste and bacterial growth in the mouth. It is recommended to pay attention to oral hygiene and brush teeth in time to relieve the symptoms. In addition, gastroesophageal reflux, cholecystitis and other causes can also lead to the above symptoms, the specific situation requires a clear diagnosis, the following are some common possible causes. 1, gastroesophageal reflux: is a kind of gastroduodenal contents reflux into the esophagus caused by discomfort and complications of the disease, the typical symptoms of reflux and heartburn, when reflux occurs can be accompanied by bitter mouth, bad breath and other symptoms. Patients can be treated with antacids and gastrokinetic drugs, such as omeprazole, domperidone, mosapride, etc.; 2. Cholecystitis: Cholecystitis is a complication of gallbladder stones, which can manifest as abdominal discomfort, fullness, belching, eructation, etc. When vomiting occurs, it can manifest as bitterness in the mouth, bad breath, cloudy yellow saliva, etc. It is recommended that an abdominal ultrasound examination be performed promptly after the appearance of symptoms to clarify the diagnosis. In addition, TCM believes that damp heat in the liver and gallbladder can also cause the above-mentioned manifestations in the oral cavity. Typical symptoms are bitterness in the mouth, bad taste in the mouth, poor appetite, constipation, etc. It is recommended to take some herbal medicines to clear heat and dampness, dredge the liver and gallbladder, such as gentian herb, scutellaria, mucuna pruriens and angelica. The specific dosage as well as the drug combinations need to be clarified after consultation with a TCM doctor.