If the symptoms of bronchitis are reduced, the routine blood test suggests that the abnormal indicators have improved, and the chest X-ray shows that the shadow is reduced or translucent, then it is a precursor to the improvement of bronchitis. 1. Fever, cough, sputum and other related symptoms are reduced. 2. When the disease is combined with bacterial infection, the number of white blood cells, the percentage of neutrophils increase, and the inflammatory indexes such as calcitonin and C-reactive protein are doubled over the normal range in the routine blood test, but these indexes will decrease if the disease improves. 3. As severe bronchitis in the examination of chest X-ray will show that there is a fuzzy shadow at the bronchial tube of the lungs, and the translucency is reduced, if after treatment, due to the inflammatory reaction subsides, the chest X-ray can show that the shadow at the bronchial tube of the lungs can be reduced or show translucency, which suggests that the bronchial foci are getting better. Improvement does not necessarily mean that the treatment can be ended immediately, but it is necessary to follow the doctor’s instructions carefully to completely remove the lesions and prevent recurrence and spread.