Allergic cough in a 7 year old child can be a paroxysmal cough, but a child with bronchitis, cough variant asthma, etc. may also have symptoms of paroxysmal cough. 1. Allergic cough: allergic cough, also known as allergic cough, can be triggered by fumes, dust, pollen, cold air and other stimuli, can be manifested as paroxysmal dry cough. 2. Bronchitis: Bronchitis is an inflammatory disease of the mucous membranes of the trachea and bronchial tubes and their surrounding tissues due to infection and other factors, which can also lead to paroxysmal coughing in a 7-year-old child, who may also cough up sputum, wheezing and other symptoms. 3. Cough variant asthma: cough variant asthma is a special type of asthma, the disease can lead to 7-year-old child cough symptoms, in addition, the child can also appear chest tightness, dyspnea and other symptoms. If a 7-year-old child develops symptoms of paroxysmal cough, it is not necessarily allergic cough, it is recommended to consult a doctor in time to identify the cause and ask the doctor to deal with it.