Bronchial asthma is an allergic disease with a complex etiology, which is the result of the interaction of internal and external factors in the human body. Intrinsic factors in the human body, such as genetics, and extrinsic factors are allergic substances in the environment, such as house mites, dust mites, various dusts, animal dander, pollen, animal proteins, nuts, drugs, etc., which are called allergens, and it can be said that allergic substances in the environment are everywhere, and less than one hundred of them can be detected in medicine at present. Special people are exposed to allergens and specific antibodies in the body combine to make the organism allergic, and these people may suffer from allergic diseases, such as bronchial asthma, allergic rhinitis (allergic rhinitis), and allergic skin diseases. Patients with bronchial asthma suffer from airway inflammation due to irritation of the airways after exposure to allergens, which increases airway reactivity, spasm of airway smooth muscle, and narrowing of airways causing asthma. Patients have chest tightness, cough, wheezing, and hear widespread or scattered croup in both lungs during attacks, often at night or in the early morning. Asthma is a reversible disease that generally resolves with treatment, and some patients can resolve on their own. A bronchodilator test or an excitation test is required to assist in the diagnosis in those with atypical symptoms. Most patients with bronchial asthma can be completely controlled with timely treatment. If the treatment is not timely, it will develop into chronic obstructive pulmonary disease, and then the chest tightness and wheezing of patients will be difficult to control completely. Therefore, early diagnosis and early treatment are necessary. Oral theophylline, β2 agonists, leukotriene receptor inhibitors, etc. are given in mild cases, and hormones are needed for a short period of time in moderate to severe cases. In recent years, a lot of research has been conducted on asthma at home and abroad, especially in the treatment. The advantages are that the drug enters the airway directly, the dose is small, and the systemic side effects are few; the disadvantage is that the oral cavity and pharynx are infected, so rinse the mouth 4–5 times immediately after inhalation to avoid oral and pharyngeal infections. The treatment of asthma advocates individualized treatment. Different patients have different degrees of severity of the disease and take different treatment plans. Patients are hereby advised to seek medical consultation from experienced doctors and not to buy medicines at their own discretion, which may delay the treatment. There is another type of asthma that is easily ignored by doctors and patients. Patients only show a cough, usually a dry cough or a small amount of white sputum, often aggravated by the smell of special odors, fumes, cold air, coughing, and in some cases, the coughing is aggravated at night, and taking cough suppressants is ineffective, and patients who continue to cough for more than two months should be alerted. A value greater than 200 ml is diagnostically relevant. If the bronchial diastolic test is negative, the patient is advised to undergo a bronchial provocation test, which has the same significance if it is positive. We call this cough allergic cough or cough allergic asthma. Some patients with cough need to have induced sputum examination if necessary and bronchoscopy has been done to clarify the diagnosis for appropriate treatment. For example, in eosinophilic bronchitis, eosinophilia in the induced talk or bronchopulmonary cell lavage fluid is also ineffective when treated with cough suppressants alone. Therefore, cough is not a simple matter, it is an external manifestation of many diseases, and it is recommended that you seek medical attention for a cough that does not heal in two months.