How to determine whether it is asthma is based on the trigger of the onset, symptoms and history at the onset, physical signs, combined with bronchodilator test or airway provocation test and other related tests. The symptoms of asthma are mainly recurrent episodes of wheezing, but also cough, chest tightness, dyspnea, coughing and other symptoms. It is mostly associated with exposure to allergens, odors, cold air, dust, chemical irritation, viral upper respiratory tract infections, and strenuous exercise. Most patients can hear wheezing sounds during an asthma attack. In severe cases, there is shortness of breath, shortness of breath, need to open the mouth to get air out, increased heart rate, high shoulders, a sense of tension, and in severe cases, cyanosis. It may be relieved by treatment or may resolve on its own in mild cases. In case of atypical symptoms, at least one of the following tests should be positive: positive bronchodilator test, positive bronchial excitation test, positive exercise excitation test, etc. A routine blood test may show an elevated eosinophil count or ratio. Patients with asthma in combination with allergic rhinitis may have some allergic symptoms such as sneezing, runny nose, itchy nose and lacrimation a few minutes before the asthma attack. Usually there is more sputum when the attack tends to resolve, sometimes presenting as a rice-like, mucus-column white mucus. Most people will be relieved by treatment, and some people can be relieved by themselves.