Atopic cough generally refers to allergic cough. Variable cough generally refers to cough variant asthma. They differ in etiology, symptoms, laboratory tests and treatment. 1. Different etiologies and symptoms: Allergic cough, often with the involvement of allergic factors, develops an irritating cough when exposed to allergens, with a predominantly dry cough. Cough variant asthma is a cough caused by airway hyperresponsiveness, often with a dry cough at night. 2. Laboratory tests: The airway hyperresponsiveness test is negative in patients with allergic cough. Cough variant asthma airway hyperresponsiveness test is positive, which can be manifested as positive bronchial provocation test and bronchodilator test. 3. Different treatments: Allergic cough can be treated with antihistamines such as loratadine, cetirizine, etc. If the effect is not good, glucocorticosteroids such as budesonide powder inhaler can be used. Cough variant asthma is mostly treated with glucocorticoids combined with bronchodilators such as budesonide formoterol powder inhaler. If patients have symptoms, they need to consult a doctor in time, make a clear diagnosis and standardize the treatment, so as not to delay the disease.