Typical clinical symptoms of bronchial asthma include sneezing, runny nose, cough, chest tightness and other premonitory symptoms. If not treated in time, asthma may occur, even sit still, dry cough or cough up white foam sputum, and even cyanosis may occur. Both lungs can hear scattered or diffuse wheezing sounds, mainly in the expiratory phase. Asthma status that cannot be relieved for more than 24 hours after the onset of acute severe asthma is called asthma status.