Allergic cough is actually a symptom, not a disease. It can be generally understood as allergic bronchitis of the respiratory tract, or as a cough with various allergic causes, which is a large group of diseases. We know that coughing is first of all a physiological reflex by which the body expels excess secretions and some dirty things from the airways. So there are two main causes of this pathology leading to symptomatic cough: ① infectious causes; ② non-infectious causes. Allergic cough would be a non-infectious cause, mainly caused by allergic diseases: 1. Allergic rhinitis: the patient has a runny nose and sneezes, and his nasal secretions flow backwards through the posterior nasal tract to the pharynx, causing tracheal symptoms that we call cough caused by postnasal drip, which is allergic cough; 2. Allergic tracheitis: inflammation of the trachea occurs as a direct result of allergens, which can also lead to cough, which is Allergic cough; 3. Cough variant asthma, a special type of allergic asthma in which the patient does not have particularly severe wheezing symptoms and his main manifestation is a persistent cough, which is also an allergic cough. So allergic cough is a general term for many types of allergic diseases that cause cough. I’m sure many of you are wondering, “How do I know if I have a cold or allergic rhinitis when I sneeze and have a runny nose? In fact, there is a difference between them. Now that it’s spring, there are a lot of allergic rhinitis patients. Many times allergic rhinitis patients often mistake themselves for a cold when they first visit the doctor and continue to have it. Allergic rhinitis and colds are the same, that is, both patients have this runny nose and sneezing nasal cartilage symptoms, but what is the main difference? If it is a common cold, the duration of the runny nose and sneezing symptoms is relatively short, usually only 2-3 days, the longest time is not more than 1 week, and the patient will be cured or turned into acute bronchitis and cough. However, in patients with allergic rhinitis, the symptoms of runny nose and sneezing last for a long time, sometimes for several weeks or even more than a month, and many patients think that this cold is not good for them. If this symptom happens to occur in the spring and autumn seasons when allergies are easy, it can be diagnosed as allergic rhinitis, which is actually relatively easy to diagnose.