Children coughing with phlegm in the early morning consider that it may be caused by childhood asthma or respiratory tract infections. 1. Childhood asthma: It is the most common chronic respiratory disease in childhood, and is now believed to be related to immune, neurological, psychiatric, endocrine factors, genetics and neural signaling pathways. It is usually characterized by paroxysmal coughing and wheezing, which is worse or intensified at night and in the early morning, and coughing up sputum when there is a lot of secretion. 2. Respiratory tract infections: such as upper respiratory tract infections, bronchopneumonia, etc., common bacterial and viral infections, or mixed infections, cough, cough sputum, fever, shortness of breath, loss of appetite, irritability and other symptoms. When children always cough up sputum early in the morning, we should consider that it may be asthma or respiratory tract infection, and we can go to regular hospitals in time to do lung ventilation examination, lung X-ray examination, allergen examination, sputum examination and other diagnosis and differentiation between the two, and take appropriate treatment measures.