Typical symptoms of bronchial asthma are episodes of expiratory dyspnea with rales, which may be accompanied by shortness of breath, chest tightness or cough. 1. Symptoms: Typical symptoms are episodes of expiratory dyspnea with rales, which may be accompanied by shortness of breath, chest tightness or cough. Nighttime and early morning attacks or exacerbations are important clinical features of asthma. The specific clinical manifestations and severity of asthma are variable at different times. 2. Harm: After the onset of the disease, the disease will generally bring patients, recurrent attacks of wheezing, shortness of breath, chest tightness or cough and other symptoms, seriously affecting the normal life of patients. When asthma is severe, even open-mouth breathing and shoulder high, rapid heartbeat, lips bruises, irritability. Each attack can last several minutes, hours or days. Long duration of the disease, frequent shortness of breath, wheezing, but also can be complicated by emphysema, and even the occurrence of pulmonary heart disease. It is recommended that patients with bronchial asthma, go to the hospital in a timely manner, under the guidance of the doctor active treatment, so as not to delay the condition.