When there is only cough and phlegm, but no fever, sore throat or breathlessness or shortness of breath, it is usually bronchitis, which does not have many other symptoms, but cough and phlegm. It is important to pay attention at this time because chronic bronchitis can be recurrent, just coughing or phlegm, and only when it is very severe will there be problems with breathing or croup. This kind of bronchitis needs to be distinguished whether it is caused by infection or allergy, or by external stimuli, such as smoking or inhalation of some polluted air. For example, if it is related to an external sensation, it is usually better to clean the airway and clear the lungs; if there are pollutants, the environment should avoid these pollutants, for example, if you repeatedly cough and cough up phlegm when you smoke, it is still recommended to quit smoking first, after not smoking the body itself will discharge these garbage and dirty things outward, and the symptoms can be improved with a little assistance in treatment. If it is allergy, we should check the allergen, and then treat the allergy from the root, such as increasing the San Fu paste, and increasing some meridian guidance treatment, which can reduce or control the symptoms of cough and phlegm.