The symptoms of chronic bronchitis primarily include coughing, expectorating phlegm, or accompanied by wheezing. Coughing generally occurs mainly in the morning, with bouts of coughing or expectoration during sleep. The sputum is white, viscous, or serous foamy, and is more prevalent in the morning. Getting up or changing body position can stimulate expectoration. In patients with prominent wheezing symptoms, it is referred to as asthmatic bronchitis, and some may also develop bronchial asthma. However, the presence of emphysema can manifest as shortness of breath after labor or activity. If the condition persists for three months each year, for two consecutive years or more, it can be clinically diagnosed as chronic bronchitis.