Allergic cough is actually an allergic bronchitis of the respiratory tract, which is caused by a variety of allergic causes. Coughing is a normal physiological reflex through which the body expels excess secretions from the airways, and it is only when there is a pathological cause for an increased degree and frequency of coughing that it is the formation of a disease. This pathology leads to symptomatic coughing for these two main reasons: 1. infectious causes; 2. non-infectious causes. I. Which is caused by allergic cough, which is the starting point for non-infectious causes, usually occurs in these cases: 1. Allergic rhinitis: coughing and runny nose, tracheal symptoms caused by the backflow of the patient’s nasal secretions through the posterior nasal passage to the pharynx; 2. Allergic bronchitis: inflammation of the trachea as a direct result of the allergens to which the patient is exposed; 3. Cough variant asthma: this is the most easily misdiagnosed of the asthma diseases A special type of allergic asthma in which the patient does not have severe wheezing symptoms, but only a persistent cough, is also an allergic cough II. Clinically, most patients with allergic rhinitis are often mistaken for a cold when they are first seen and persist. In fact, there is a difference between the two: for a common cold, the runny nose and sneezing symptoms are short-lived, with a cycle of no more than 7 days, after which they may heal or become acute bronchitis; but for patients with allergic rhinitis, their symptoms will last for a long time, a month, three months or even longer.