A child’s constant runny nose can be due to allergic rhinitis, and it can also be due to an upper respiratory infection, which is treated differently for different reasons. There is no good method that is suitable for all diseases. 1. Allergic rhinitis: allergic rhinitis is a kind of allergic reaction disease of the nasal mucosa, the disease can lead to the symptoms of the child’s runny nose all the time, the treatment can be cetirizine, budesonide nebulization, montelukast sodium and other drugs as prescribed by the doctor. 2. Upper respiratory tract infections: upper respiratory tract infections in babies can also have a runny nose all the time, can be under the guidance of the doctor to be pediatric cold and flu granules and other symptomatic supportive treatment. If necessary, can be given sputum suction care, improve nasal ventilation. In addition to the above diseases, other factors can also lead to the symptoms of a child’s runny nose, it is recommended to consult a doctor in a timely manner to identify the cause, and follow the doctor’s instructions for treatment.