Symptoms of chronic bronchitis in children include respiratory symptoms (e.g. cough, sputum, wheezing, etc.), and developmental backwardness. 1. Respiratory symptoms: cough and sputum, accompanied by mild to moderate wheezing, which is more frequent in the early morning and at night, and can become sticky yellow sputum when the condition worsens or when it is combined with bacterial infection. Bronchospasm can occur when wheezing, infection and after exertion obvious. Children may also have chest pain. Most of the above symptoms appear in winter, but the weaker ones can also appear in summer. 2. Developmental delay: some children may be behind in development, such as height, weight, and athletic ability lagging behind children of the same age, and the children generally have poor physical strength. Children with chronic bronchitis need to go to the hospital in time, follow the doctor’s instructions for treatment, so as not to miss the opportunity for treatment, do not unauthorized use of drugs.