The late stage of recovery from acute bronchitis usually does not show yellowish thick sputum. Acute bronchitis usually lasts for 1-2 weeks, and the late stage of recovery usually shows a significant decrease in sputum, or even the absence of sputum. The presence of yellow, thick, purulent sputum usually suggests that the disease is not yet under control, and the purulent secretion may be caused by airway inflammation due to bacterial infection. It is recommended to continue to give anti-inflammatory expectorant treatment, and drink more water, light diet, do not eat sweet, greasy and spicy food. It can be combined with nebulized inhalation and more patting on the back to promote the expulsion of phlegm. When yellow purulent mucus sputum appears in the late stage of bronchitis, it is recommended to go to the hospital for review in time and standardize the treatment under the guidance of the doctor.