What is the cause of expectoration in the morning

Because after a sleep, the lung secretions will begin to deposit. When the body position changes, it can promote the discharge of sputum due to reactive cough. Usually, pay attention to avoid smoking, which can reduce the production of sputum. When a person is sleeping, the secretion of sputum is reduced, and the sputum will be concentrated and become sticky, which will be discharged the next morning. If there is no bronchitis, it can be treated without medication. People who have less secretions and are not easy to cough often have a habitual dry cough, as well as throat clearing and expectoration.