Shortness of breath can be caused by physiological factors, foreign body inhalation, cold and other factors. 1. Physiological factors: For example, if a child is frequently active and exercises too much, shortness of breath will occur without other clinical symptoms, which is a physiological phenomenon, and can be improved by itself after reasonable rest. 2. Foreign body inhalation: such as peanuts, walnuts, etc., may lead to airway obstruction, which will cause shortness of breath, may also be accompanied by coughing, and in severe cases can lead to asphyxia. 3. Colds: may be related to viral infections, can lead to fever, there will be rapid breathing and heartbeat phenomenon, accompanied by coughing, sneezing, runny nose and other symptoms. The child’s shortness of breath, there may also be other reasons, such as lung infection, congenital heart disease, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.