The symptoms of bronchial asthma vary from person to person, as does its severity. Some patients may have very mild symptoms, only showing slight chest tightness and mild coughing. Other patients may experience very severe symptoms such as respiratory failure, loss of consciousness, cardiac arrest, and sudden death. The clinical presentations are completely different. Therefore, bronchial asthma can be considered a suppressive disease, meaning everyone's symptoms are different, and one cannot generalize; most patients are relatively mild.