Waking up in the morning with phlegm in the windpipe usually indicates the presence of respiratory system diseases, pharyngeal diseases, nasal diseases, etc. 1. Respiratory diseases: such as bronchitis, bronchial dilatation, chronic obstructive pulmonary disease, tuberculosis, lung cancer and other diseases, will produce symptoms of coughing up phlegm, resulting in phlegm in the trachea in the morning. 2. Pharyngeal diseases: such as chronic pharyngitis, allergic pharyngitis, etc., inflammatory mediators will stimulate the mucous membrane of the pharynx, resulting in increased secretion, congestion, edema, and so on, thus appearing in the morning phlegm in the airways, accompanied by dry pharynx, pharyngeal itchiness, coughing and coughing symptoms. 3. Nasal diseases: common in sinusitis, chronic rhinitis, post-nasal drip syndrome patients, can be due to nasal mucosal secretions backflow into the trachea, thus causing the symptoms of tracheal phlegm, usually in the morning coughing, coughing phlegm, runny nose. When you wake up in the morning and feel phlegm in the trachea, it is recommended to go to the regular hospital in time to get a clear diagnosis and symptomatic treatment.