Lung spasm refers to bronchospasm, spasmodic contraction of bronchial smooth muscle will make the airway become narrow, airway resistance will have a sudden increase, manifested as chest tightness, shortness of breath, dyspnea, will cause hypoxia symptoms, the patient has the lips and facial cyanosis, and even cause asphyxiation in severe cases, mainly due to bronchial asthma, chronic bronchitis, allergic diseases. Bronchospasm can also be caused by anesthetic drugs that excite the vagus nerve or promote histamine release. According to the patient’s medical history, other clinical manifestations and examination to make a correct diagnosis, need to be treated with bronchodilating drugs, the more serious symptoms also need to use glucocorticoid drugs.