The main reasons for waking up in the morning with a dry and bitter tongue and bleeding are oral diseases (periodontitis, etc.), respiratory diseases (tumors, etc.), digestive diseases (gastric ulcer, etc.), which need to be analyzed specifically. 1. Oral diseases: mainly related to oral inflammation, mucous membrane damage and other factors, such as gingivitis, periodontitis, etc., can appear in the oral cavity dry and bitter, odor, bleeding and other symptoms. 2. Respiratory diseases: some respiratory diseases can present coughing blood symptoms, caused by inflammation or tumors, such as tuberculosis, lung cancer and so on. 3. Gastrointestinal diseases: common gastrointestinal bleeding is gastric ulcer, gastroesophageal reflux disease and other diseases, which can present symptoms such as dry mouth, bitter taste and bleeding. If you often wake up with dry and bitter tongue and bleeding, it is recommended to consult a doctor in time to clarify the cause of the disease so as not to delay the condition.