The characteristic manifestations of chronic bronchitis are 3 words: cough, sputum and wheezing. Specifically: 1. Cough: Patients show a long-term chronic cough, some patients cough during the day, some at night, different patients have different characteristics; 2. Sputum: Some patients cough with sputum, some patients are not accompanied by sputum, depending on the cause of the patient’s attack; patients with bacterial infection can appear yellow sputum, more viscous, more volume, after the improvement of treatment, sputum can become white, sputum 3. wheezing: some patients have cough with or without wheezing; most patients with wheezing have more pronounced wheezing at night with wheezing, and some patients can also have wheezing during the day, which is more obvious after activity. In patients with very pronounced and severe wheezing, you can hear the patient wheezing without a stethoscope; if the symptoms are mild, a physical examination with a stethoscope is required to detect it.