Coughing up white sputum in children is often considered to be related to respiratory tract infections, bronchitis, allergic pharyngitis and other causes. 1. Respiratory tract infection: If the respiratory tract infection may cause coughing white phlegm phenomenon, such as mycoplasma infection, viral infections, usually show nasal congestion, runny nose, coughing up phlegm and other symptoms, phlegm color can be white. 2. Bronchitis: Bronchitis caused by cold stimulus, due to inflammation of the airway, resulting in increased secretion, manifested as cough with coughing white sputum, mostly due to viral infections. 3. Allergic pharyngitis: allergic pharyngitis is caused by irritation of the pharyngeal mucosa after exposure to allergens, which may lead to pharyngeal mucosal congestion, edema, increased secretions, may cause coughing, white phlegm and other symptoms. Children coughing white sputum may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.