Asthma, or bronchial asthma, is a heterogeneous disease characterized by chronic airway inflammation. Symptoms of asthma include wheezing, dyspnea, shortness of breath, chest tightness, and cough. Typical symptoms of asthma are recurrent episodes of wheezing, shortness of breath, chest tightness, or coughing, with severe episodes of severe dyspnea and hypoxemia in a short period of time. Symptoms can come on within minutes and last for hours to days, and can be relieved by asthma-alleviating medications or resolve on their own. Nocturnal and early morning attacks or exacerbations are important clinical features of asthma. In addition, atypical asthma without wheezing symptoms exists clinically, and patients may present with episodes of cough, chest tightness, or other symptoms. Atypical asthma in which cough is the only symptom is called cough variant asthma. Atypical asthma in which chest tightness is the only symptom is called chest tightness variant asthma. Some patients, especially adolescents, have asthma symptoms that occur during exercise, which is called exercise asthma. The specific clinical manifestations and severity of asthma are variable at different times. It is recommended to consult a doctor when the above symptoms occur and follow the doctor’s instructions.