Coughing up phlegm is a common symptom of chronic bronchitis. When patients with chronic bronchitis experience coughing up phlegm, they can initially use medications to expel the phlegm. They may choose some expectorant medications or bronchodilators to help expel the phlegm. If the phlegm is thick and sticky, cough suppressants should be used with caution to avoid affecting the expulsion of phlegm. Additionally, drinking more water and having a lighter diet can also facilitate the expulsion of phlegm. Another method is to use turning and patting on the back to help expel the phlegm. (Specific medications should be used under the guidance of a physician.)