Children with a low fever that does not go away and coughing all the time may be caused by acute upper respiratory tract infections, but also acute bronchitis, bronchopneumonia and other lower respiratory tract infections. Acute upper respiratory tract infection, which is what we often call a cold, is caused by a variety of viruses and bacteria invade the nose, pharynx, mainly manifested as nasal congestion, runny nose, cough, sore throat and other respiratory symptoms and fever, headache, malaise and other systemic symptoms, is the most common disease in children. Therefore, a child with a low fever that does not go away and coughing all the time may have an acute upper respiratory tract infection. Lower respiratory tract infections can be divided into acute bronchitis and bronchopneumonia according to the site of pathogen invasion. Acute bronchitis is mainly manifested as cough, can be accompanied by low fever; bronchopneumonia is mainly manifested as fever, cough, shortness of breath and mental instability and other symptoms. Therefore, children with a low fever, coughing all the time may also be acute bronchitis, bronchopneumonia and other lower respiratory tract infections. Children with low fever and cough may also be caused by other diseases, such as measles, etc. It is recommended to go to the hospital to clarify the cause of the disease and standardize the treatment, so as to avoid delays in the condition.