If you have obvious history of hypertension and/or coronary heart disease and/or diabetes mellitus, and you suddenly have shortness of breath, especially if you cannot lie down, first of all, consider cardiogenic asthma immediately, if you have left-sided chest pain, then it may be cardiogenic asthma caused by acute heart attack, it is recommended to call 120 immediately, sit in a sitting position with legs hanging under the bed, try to maintain emotional stability, not to be impatient (the more impatient, the worse), reduce activities, take testosterone, anti-cardiac pain and other drugs, and inhale oxygen in time if possible. The worse it is), reduce activity, take tachyphylaxis, cardioplegia and other medications, and get oxygen if possible. If you originally have a history of chronic wheezing bronchitis or bronchial asthma, the sudden appearance of shortness of breath is firstly considered to be related to old slow bronchial or bronchial asthma attack, of course, the possibility of pneumothorax cannot be completely ruled out, it is recommended to immediately inhale bronchodilators such as salbutamol, inhaled hormone (Promethazine) (remember to inhale salbutamol first, then hormone), timely oxygenation if possible, reduce activities, and call 120 to send to the hospital in time. Hospital.