A bitter taste in the throat may be related to pharyngeal diseases, digestive disorders, dietary factors and other reasons. 1. Pharyngeal diseases: such as chronic pharyngolaryngitis, due to bacterial and other pathogenic infections caused by increased local secretions, there will be a pharyngeal anosmia, which may feel a bitter taste. 2. Digestive system diseases: such as bile reflux gastritis, bile-containing duodenal contents refluxed into the stomach, caused by inflammation of the gastric mucosa, so that the gastric mucosa undergoes erosion and hemorrhage, vomiting of bile and other symptoms, resulting in a bitter taste in the throat. 3. Eating factors: after consuming some foods or medicines with bitter flavor, the bitter taste may remain in the throat. 4. Others: Elderly patients with combined diabetes or oral diseases may have dysbiosis of oral flora and bitter throat symptoms due to low immunity of the body. If there is a bitter taste in the throat, it is recommended to consult a doctor in time to clarify the cause of the disease and standardize the treatment under the guidance of the doctor.