Children do not have a cold daytime dry cough, no cough at night to eat cough medicine has no effect, may be dry cough due to acute bronchitis, laryngitis, allergies and other reasons. It is recommended that patients do not take medication without authorization, should go to the hospital in a timely manner to clarify the cause of the disease. 1. Acute bronchitis: there are often symptoms of upper respiratory tract infections such as nasal congestion, sore throat, etc., and in the later stage, there may be a dry cough or accompanied by a small amount of mucous sputum and other symptoms. Generally the daytime activity is greater, there will be a dry cough during the day, not cough at night 2. Laryngitis: It can be manifested as hoarseness, cough, sore throat, increased secretion in the throat, laryngeal discomfort and other symptoms. Ribavirin, penicillin, prednisone, dexamethasone and other drugs can be used to treat. 3. Allergy: When a child comes into contact with allergens during the day, symptoms such as rash, cough, runny nose and red eyes may occur. After a period of time the symptoms improve and there is no cough at night. 4. Psychogenic cough: If other organic diseases are excluded, parents should consider whether the cough is psychogenic, and find out whether the child has been under too much pressure in school recently, or whether the relationship between classmates is harmonious. Parents can give the child appropriate psychological hints, and observe whether the cough symptoms are reduced. Patients are advised not to take medication without authorization, and should go to the hospital to get a clear picture of the cause of the cough.