1, wheezing Most asthma patients have typical recurrent wheezing, accompanied by extensive and high-profile wheezing sounds. Symptoms often appear within a few minutes, lasting for several minutes or days, and then relieve themselves or after drug treatment. Some patients can relapse after a few hours of remission, and occasionally patients with critical acute attacks die. But severe attacks can also be fatal. Asthma attacks have obvious seasonality, high incidence in spring and autumn, and have the characteristics of attack or aggravation at night or early morning. 2. Cough is often the most important experience for asthma patients, and it is also one of the reasons for seeing a doctor. Cough itself is a defense mechanism, which is helpful for the body to remove foreign bodies and secretions from the airway. Asthma cough is irritating dry cough, or coughing white foam sputum. Asthma is the first cause of cough in children, the second cause of cough in adults and the third cause of cough in the elderly. 3. Patients with chest tightness often feel a sense of oppression, suffocation and difficulty breathing. When asthma attacks, patients often feel that the inhaled air is sufficient, but they can't breathe out, so they involuntarily pout and show "fish mouth breathing". Chest tightness can occur at the same time as wheezing, or it can exist alone. 4. Other asthma attacks are a typical allergic reaction process mediated by inflammatory cells and mediators. Therefore, patients are often accompanied by allergic diseases in other systems of the body, such as allergic rhinitis and skin eczema.