Prolonged coughing in children may be caused by tuberculosis, prolonged bacterial bronchitis, pulmonary cystic fibrosis and other diseases. 1. Tuberculosis. The main manifestations are cough, sputum, hemoptysis and chest pain. Cough is mild, if combined with bronchial tuberculosis, manifested as irritating cough. 2. Delayed bacterial bronchitis. The main feature is long-term, repeated, gradually aggravated cough. Early only in the winter and spring when the climate change is intense or exposure to harmful gases (such as smoking) after the onset of summer or stop exposure to harmful gases (such as smoking cessation) after the cough to reduce or disappear. The cough is usually heavier in the morning and lighter in the daytime, and there is coughing or sputum expectoration before going to bed. After coughing up the mucus sputum, the chest feels relieved and the cough is relieved. 3. Pulmonary cystic fibrosis. The vast majority of patients begin to show symptoms in childhood. It is characterized by recurrent respiratory infections, lung shadows, etc. The main symptoms are chronic dry cough, yellow sputum when infected, increased sputum volume, shortness of breath, and fatigue. Symptoms alternate between stable and acute episodes. Lung function gradually decreases, and symptoms such as dyspnea and hemoptysis gradually appear, and respiratory failure may occur in severe cases. Children with long-term cough may also have other causes, such as cough variant asthma, allergic cough, etc. It is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.