The common clinical causes of chest tightness and distension include physiological factors such as emotional tension and strenuous exercise, as well as pathological factors such as coronary heart disease and pleurisy. 1. Physiological factors: when the body is in a state of emotional tension or just after strenuous exercise, breathing will deepen and accelerate, and some people may experience chest tightness, chest swelling and other symptoms. This situation can be normalized after proper rest and relief of tension. 2. Pathological factors: (1) Coronary heart disease: people with coronary heart disease have insufficient coronary artery blood supply, which is clinically manifested as chest wall boring pain and persistent or intermittent chest tightness, etc. This kind of people can be diagnosed clearly by perfecting electrocardiogram, ECG ultrasound and coronary CT. (2) Pleurisy: in people with pleurisy, the clinical symptoms include chest pain and chest tightness, and in severe cases, dyspnea may occur, requiring hospitalization. For recurring swelling and chest tightness or prolonged non-recovery, it is recommended to go to the hospital in time to avoid delaying the condition.