Chest tightness can be due to variant asthma, but it can also be caused by physiologic factors or other diseases. Variable asthma is a special type of asthma in which patients usually do not have obvious symptoms of wheezing and shortness of breath, but have airway hyperresponsiveness, which is mainly manifested by symptoms such as cough and chest tightness. Therefore chest tightness may be caused by variant asthma. However, chest tightness is a subjective feeling, and it may also be functional chest tightness caused by physiological factors such as lack of air circulation and excessive tension, or it may be pathologic chest tightness caused by chronic bronchitis, emphysema, coronary heart disease and other diseases. Chest tightness caused by physiological factors can be relieved on its own after relaxing and breathing fresh air, while chest tightness caused by pathologic factors is usually accompanied by coughing, coughing up phlegm, chest pain and other symptoms, and it is recommended to consult a doctor in time and follow the doctor’s instructions to treat it actively.