If you have chest tightness and shortness of breath and difficulty in breathing at the age of 20, if you are of a taller, leaner and longer body type, it is likely that a spontaneous pneumothorax has occurred, and you need to go to the hospital for a plain film of the chest position as well as a lateral film to confirm the diagnosis. If it is indeed a case of pneumothorax, if the degree of pneumothorax is not too heavy, less than 20%, that is, the compression of the lung, absolute bed rest can be carried out and no special treatment is needed. If the degree of pneumothorax is relatively large and the compression of the lung is more than 20%, the patient needs to be treated with suction therapy or surgery depending on the patient’s condition. In addition, if the 20-year-old has chest tightness and shortness of breath, there is also a possibility that the attack is asthma, you need to go to the hospital to check the bronchodilator test or bronchial excitation test, if the test result is positive, the diagnosis of asthma can be confirmed, you need to inhale bronchodilators and glucocorticoids for treatment. Inhalation of budesonide and terbutaline is needed in the acute phase, and inhalation of Cymbalta can be used to prevent asthma attacks in general.