It is characterized by recurrent coughing for a long period of time, mostly in the cold season, sudden changes in temperature, frequent coughing in the morning and evening, and reduced during the day.

2. Sputum

Mostly white mucous sputum, or white foamy sputum, more sputum in the morning and evening. The amount of sputum increases when combined with infection and is mucopurulent.

3. Wheezing

Some patients may have bronchospasm, causing wheezing, mostly in the acute stage.

4. Signs

Early on, there may be no abnormal signs or only rough breath sounds, with the development of the disease, the lungs can be heard dry and wet rales in acute episodes of dry and wet rales increased, coughing up sputum after the rales can be reduced. The chronic bronchitis of wheezing type can be heard rales.