Chest tightness is mainly refers to breathing effort or not enough air, the symptoms are serious and also easy to cause dyspnea, most of them are caused by respiratory system diseases and heart diseases. Lung diseases mainly include bronchitis, chronic obstructive pulmonary disease, emphysema, bronchial asthma, pulmonary atelectasis, etc. Narrowing of the airways, tumors in the bronchial tubes, and enlargement of the thyroid gland will all lead to obstruction of the respiratory tract, which will easily lead to the symptom of tightness in the chest. You need to go to the hospital to take a chest X-ray or do a CT examination of the lungs, and also need to do an electrocardiogram, gas and blood analysis, blood routine examination. According to the results of the examination and other accompanying symptoms, as well as physical examination to clarify the diagnosis and active treatment, if the examination are no problem, may also be due to cardiac neurosis.