The causes of chest tightness and shortness of breath are often complex and need to be analyzed and judged in conjunction with clinical reality. Common causes include bronchial asthma, spontaneous pneumothorax, pleural effusion, chronic obstructive pulmonary disease, heart disease, etc., as follows: 1. Bronchial asthma: If chest tightness and shortness of breath appear in young people, the possibility of bronchial asthma is generally considered, especially in patients with a history of allergy. 2. Spontaneous pneumothorax 3, pleural effusion: If there is fever or chest pain, consider whether there is a large amount of pleural effusion. 4, chronic obstructive pulmonary disease: If the elderly appear chest tightness, shortness of breath, the first thing to exclude whether there is chronic obstructive pulmonary disease, especially the elderly who smoke. 5, heart Diseases: If chest tightness and shortness of breath occur when there is a history of hypertension or coronary heart disease, it is important to consider the possible existence of cardiac insufficiency or myocardial infarction. Therefore, chest tightness and shortness of breath often require timely improvement of electrocardiogram, pulmonary function, lung CT, cardiac ultrasound, cardiac enzymes and other related tests to make a clear diagnosis.