During an asthma attack, the typical sign is a widespread croup in both lungs, characterized by a high tone, similar to a wire-like tremor sound, and a prolonged expiratory sound, and if the condition is more critical, a “silent lung” will appear, which means that the croup will instead diminish or even disappear completely. Asthma is mainly divided into allergic asthma, sports asthma, cough asthma, occupational asthma and aspirin asthma. In addition to the typical signs that can indicate an asthma attack during an attack, it can also be judged by the main symptoms, which can manifest as shortness of breath, shortness of breath, wheezing, coughing, dyspnea, chest tightness, etc. In addition, the clinical manifestations of different types of asthma usually have some variability, and patients are advised to seek timely medical attention for targeted treatment, and symptoms can usually be relieved after receiving treatment or on their own. 1. allergic asthma: usually also accompanied by symptoms of local allergy or systemic allergy, which can be manifested as sneezing, runny nose, coughing sputum, fever, etc.; 2. locomotor asthma: this type of asthma can show after lung examination obvious dry rales, croup, or no symptoms after exercise, or atypical symptoms, such as fatigue, headache, abdominal pain, muscle cramps and discomfort during exercise; 3. Cough asthma: also known as cough variant asthma, the clinical manifestations are usually irritating chronic cough without wheezing symptoms, usually attacking or intensifying at night or early morning; 4. Occupational asthma: in occupational species exposed to amines, After exposure to amines, isocyanates, phthalic anhydride and other asthma-causing substances, the clinical symptoms are mainly itchy eyes and lacrimation in addition to typical asthma; 5. Aspirin asthma: refers to asthma that appears after taking aspirin, patients with diseases such as concomitant sinusitis and nasal polyps usually have a higher incidence after taking aspirin, which can manifest as excessive sweating, irritability, cyanosis of the lips and mouth, conjunctival congestion, etc. Some patients may also develop urticaria, Some patients may also develop serious symptoms such as urticaria and shock.