Asthma white sputum may be combined with respiratory tract infection, combined bronchial dilatation and other diseases. 1. Combined respiratory infections: asthma is usually not accompanied by coughing up sputum or coughing up a small amount of white sputum, often with a dry cough, chest tightness, shortness of breath and so on as the prominent manifestation, if there is a lot of white sputum to be vigilant about combined respiratory infections. 2. Combined bronchial dilatation: chronic cough and sputum are caused by bronchial dilatation, the amount of sputum may be more. If asthma is combined with bronchial dilatation, it may be manifested as chest tightness, wheezing, coughing white sputum and other symptoms. 3. Other diseases: clinically there is a special kind of disease called allergic bronchopulmonary aspergillosis, which has a series of symptoms of asthma, but also cough and white sputum. There are many causes of asthma white sputum, need to pay attention to timely admission to the hospital to find out the cause of the disease, to give targeted treatment, to avoid delayed treatment, resulting in aggravation of the condition, or even life-threatening.