Typical clinical manifestations of bronchial asthma include: aura symptoms such as sneezing, runny nose, cough, chest tightness, etc. In case of exacerbation, wheezing and dyspnea may occur, which may be accompanied by dry cough or copious white foamy sputum. In severe cases, forced sitting or sitting breathing and cyanosis may occur. However, it can generally be relieved by itself or after treatment with wheezing medications. In some patients, the asthma may reappear after a few hours of remission and may even lead to a persistent state of asthma. There are also atypical asthma manifestations in the clinical setting. In cough variant asthma, for example, the patient has been coughing for more than 2 months without obvious triggers, with frequent attacks at night and in the early hours of the morning, aggravated by exercise, cold air, etc., with the presence of hyperresponsiveness in airway reactivity measurements, ineffective treatment with antibiotics or cough suppressants or expectorants, and effective treatment with bronchial antispasmodics or corticosteroids, provided that other diseases causing the cough are excluded.