Always chest tightness breathlessness may be chronic myocardial ischemia, chronic heart failure, pericardial effusion, pleurisy, neurosis, chronic obstructive pulmonary disease and other causes. 1. Chronic myocardial ischemia: due to coronary artery atherosclerotic lesions, resulting in limited blood supply to the heart, chronic ischemia of myocardial cells and always tightness in the chest and shortness of breath. 2. Chronic heart failure: long-term cardiac insufficiency leads to circulatory disorders, insufficient ejection of blood from the heart, stagnation of blood in the heart, so there is always chest tightness and shortness of breath. 3. Pericardial effusion: Inflammation of the pericardium, tumor invasion, trauma and other conditions lead to an increase in exudate, pericardial effusion, the heart is compressed and chest tightness and shortness of breath. 4. Pleurisy: bacterial and other pathogenic infections, autoimmune and other causes lead to pleurisy inflammatory lesions, exudation, adhesions, etc., so there will always be chest tightness and shortness of breath. 5. Neurosis: exclude organic lesions, may be nerve dysfunction, mental factors and other causes of sensory abnormalities. 6. Chronic obstructive pulmonary disease (COPD): chronic inflammation of the airway leads to narrowing of the airway and limitation of lung function, which results in chest tightness and breathlessness. Constant chest tightness and shortness of breath may be related to a variety of factors, and it is recommended to consult a doctor for a clear diagnosis.