The causes of chest tightness are generally adverse environmental factors, adverse mental factors, respiratory diseases, lung diseases, heart diseases, etc. 1. Environmental factors: If you are in a room with poor air circulation for a long period of time, you may feel chest tightness; or if the ambient air pressure is low, you may also feel chest tightness. 2. Mental factors: chest tightness may occur when mood is low or irritable. Pathologic chest tightness: refers to chest tightness caused by or accompanied by some diseases. 1. Respiratory tract obstruction: such as tracheal obstruction or narrowing, tracheal compression, etc. can cause symptoms of chest tightness. 2. Lung diseases: such as atelectasis, pneumothorax chronic obstructive pulmonary disease may cause chest tightness. 3. Heart disease: such as coronary heart disease, heart failure, arrhythmia, etc., can cause chest tightness. If patients feel chest tightness, it is recommended to go to the hospital as soon as possible, and be treated scientifically by the doctor.