The reason is usually a subjective feeling, which may be physiological, such as hot weather, fatigue, lack of sleep, work pressure, emotional tension and anxiety, etc. This condition usually disappears naturally after sufficient rest and self-regulation. In addition, pathological reasons can also cause patients to appear on the symptoms of gas, such as respiratory disease, cardiovascular disease, it is recommended to check the electrocardiogram, chest X-ray, lung function, etc., to determine the cause of treatment. 1, respiratory disease: common acute attacks of bronchial asthma, acute wheezing bronchitis, pneumonia, interstitial pulmonary fibrosis, pulmonary atelectasis, large pleural effusion or pneumothorax compression of lung tissue, etc. . . In addition, if the patient’s airway foreign body obstruction, so that the trachea pressure, can not be normal ventilation, can also appear the symptoms of gas on the can not. 2, cardiovascular disease: common such as coronary angina, myocardial infarction, pericardial effusion or pericardial tamponade, heart failure, cardiac insufficiency, etc., can appear to varying degrees of gas on the can not, especially will appear in the lying down state, the increase in the amount of return blood, resulting in night paroxysmal dyspnea. 3. Other: If carbon monoxide poisoning, metabolic acidosis, etc. can also occur wheezing, can not get on the air symptoms, should promptly seek medical attention to avoid life-threatening.