Bitter mouth and dry mouth in the morning may be: the surrounding environmental problems (such as environmental dryness, etc.), physiological factors (such as low water intake, open-mouth breathing, etc.), pathological factors (such as oral diseases, reflux esophagitis, etc.), need to be specifically analyzed. 1. Peripheral environmental problems: when the sleep environment is dry, dry mouth will appear in the morning when you get up, bitter mouth, can be improved by increasing the humidity of the air, such as air humidifiers or the ground can be placed on the floor before going to bed a pot of water. 2. Physiological factors: when drinking less water, dry mouth and bitter mouth will occur when getting up in the morning, which can be improved by drinking more water, and the daily water intake can be around 1500ml; if there is open-mouth breathing at night, dry mouth and bitter mouth will occur in the morning due to excessive loss of water, it is recommended to consult respiratory clinic to find out whether there is tonsillar hypertrophy and other conditions. 3. Pathological factors: oral diseases such as periodontitis, reflux esophagitis and other diseases can cause dry mouth in the morning, bitter mouth, but also can be accompanied by bleeding gums, acid reflux heartburn and other symptoms, periodontal diseases need to be stomatology specialist clinic, gastroscopy, 24-hour acid pressure measurement and other tests can be assisted in defining the diagnosis of reflux esophagitis. There are many reasons for the early onset of bitter mouth and dry mouth, such as in the improvement of environmental factors, drink more water after no improvement or progressive aggravation, it is recommended to consult a doctor in a timely manner, so as not to delay the condition.