Frequent chest tightness feeling out of breath may be due to physiological factors and pathological factors such as coronary heart disease, angina pectoris, chronic obstructive pulmonary disease, asthma, heart failure and so on. 1. strenuous exercise: due to strenuous exercise, the body’s metabolism accelerates, the need for oxygen increases, thus need to increase the respiratory rate to meet the body’s demand for oxygen during strenuous exercise, there will be often chest tightness feel out of breath performance, is a normal physiological phenomenon. 2. Coronary heart disease: due to coronary atherosclerosis leading to plaque formation, resulting in cardiovascular blockage, insufficient blood supply and narrowing of blood vessels, thus triggering frequent chest tightness and feel out of breath and other symptoms. 3. Angina pectoris: insufficient blood supply to the coronary arteries leads to the occurrence of angina pectoris. Insufficient blood supply, myocardial ischemia, easy to cause frequent chest tightness and feel breathless. 4. Chronic Obstructive Pulmonary Disease (COPD): The occurrence of COPD is caused by airflow obstruction due to smoking and environmental factors. Restricted blood flow and insufficient oxygen intake can lead to frequent symptoms of chest tightness and breathlessness. 5. Asthma: If exposure to cold air, allergic substances, etc., will stimulate the bronchial tubes to cause narrowing, affecting the lung ventilation function, there will be frequent chest tightness and feel out of breath performance. 6. Heart failure: usually exacerbated by cardiovascular disease, resulting in cardiac pumping dysfunction, reduced return blood volume, cardiac blood volume is insufficient, there will often be chest tightness feeling out of breath symptoms. If there is panic, chest tightness, shortness of breath, dyspnea and other symptoms, it is recommended to go to a regular hospital, identify the cause and follow the doctor’s instructions for treatment.