Bronchial asthma is a relatively very complex disease in which chronic inflammation of the airways involving a variety of cells and cellular components such as eosinophils, mast cells, and T cells can lead to airway hyperresponsiveness and can cause airway narrowing, manifested by recurrent episodes of wheezing, chest tightness, or coughing, which often flare up and worsen at night and/or early in the morning. Initially, it may resolve on its own or with treatment. At the same time, asthma is a rather general concept, most commonly caused by allergies, on the basis of genetics by some external stimuli, it has a variety of causes, specifically there are two aspects of endogenous and exogenous factors, its intrinsic factors are individual factors, that is, genetic factors, the existence of family aggregation phenomenon, a family may have several people have asthma, there are some secondary factors, such as dust mites. The second factor is the infection, such as viral upper respiratory tract infection may lead to asthma attack. The third is the change of climate, which can lead to asthma attacks when the temperature changes. There is also exercise, which also causes some people to have asthma attacks, as well as some medications, and some women who have asthma during their menstruation. This type, which does not have wheezing symptoms like typical asthma, is a dry cough, basically he has no history of asthma, the cough can be delayed for 3 to 8 weeks or even longer, there is no wheezing, dyspnea, chest The test is normal, but one thing is that the airway reactivity is high, because it is essentially asthma; bronchial excitation or bronchodilatation test can be performed, and some drugs can be used to induce airway spasm after inhalation, or some dilating drugs can expand the airway, and the drug reactivity is stronger; in addition, diagnostic treatment can also be performed.