Dyspnea is a subjective feeling of air insufficiency in patients, objectively manifested by the need to exert oneself to breathe, and in severe cases, nasal flapping, open-mouth breathing, cyanosis, involvement of auxiliary respiratory muscles in respiratory activity, and abnormalities in respiratory rate, depth or rhythm. In case of laryngeal edema, foreign body obstruction and diphtheria, inspiratory dyspnea is often caused; in case of emphysema, fine bronchospasm or obstruction, or bronchial asthma, expiratory dyspnea is often produced; and in case of massive pleural effusion and pneumothorax, expiration and inspiration are difficult. Clinically, it is often divided into pulmonary dyspnea, cardiogenic dyspnea, toxic dyspnea, neuropsychiatric dyspnea, and hematogenic dyspnea. Treatment should be directed at the cause. True dyspnea is easily seen by the physician, so I will not go into it here. In addition to this, dyspnea as described by the patient includes the following conditions: 1, depression: a constant or repeated chest tightness throughout the day and night, or even a sense of near death, which improves after exhaling long breaths. 2, hypotension syndrome: Occurs due to insufficient blood perfusion in the heart, lungs, brain and digestive system, mainly manifested as chest tightness, which may get better after lying down. 3, hysteria: often caused by the stimulation of life events, hint and care may improve. 4, reflux esophagitis: retrosternal stuffiness, often accompanied by burning sensation and palpitations, increased heart rhythm. 5, poor peripheral circulation syndrome: the principle is the same as hypotension, caused by normal blood pressure but various causes of peripheral vasoconstriction. When dyspnea is found, especially the more severe dyspnea, pay attention to whether it is inspiratory dyspnea or expiratory dyspnea. Inspiratory dyspnea is mainly due to obstruction of the larynx and trachea, the patient shows labored breathing, the muscles of the neck and chest are involved in respiratory movements, there are inspiratory depressions in the upper and lower clavicular fossa, the upper sternal fossa, the intercostal space and the subxiphoid process, and in severe cases there is an inspiratory croup. Lung and bronchial diseases and heart disease are the most common causes of dyspnea. These patients should be kept in a semi-sitting position when symptoms appear, so that the airway is open, take aminophylline 1-2 and expectorants, but do not use sedatives to avoid the danger, when possible, oxygen can be inhaled, dyspnea can generally be improved.