Allergic cough is not variant asthma, and the definition, cause and treatment of the two are very different. Allergic cough is a disease caused by airborne allergic substances that irritate the nasal passages, throat and other parts of the body. Symptoms include paroxysms of irritating dry cough, often accompanied by symptoms such as a scratchy throat. First consider the use of antihistamines such as loratadine, when the effect is not good, can use glucocorticoid therapy such as budesonide treatment. Variant asthma is a combination of genetic and environmental factors. In most cases, cough or chest tightness is the only symptom, and there are usually triggers, such as pollen, mites, medications, exercise, weather changes, etc. Some triggers are not easy to find. Atopic asthma cannot be completely cured, but it can be treated to relieve symptoms and improve life experience. Commonly used drugs include budesonide, salbutamol, etc., which can relieve smooth muscle spasm, and play a role in calming asthma, but it should be noted that people who are allergic to the drug are prohibited. All of the above medications should be used under the guidance of a doctor, do not self-medication.