Feeling unable to catch the breath is mainly caused by lack of oxygen, will cause the symptoms of chest tightness and shortness of breath, the causes of this symptom or more, mainly due to chronic diseases of the respiratory tract caused by emphysema, bronchial asthma, chronic obstructive pulmonary disease, chronic bronchitis will affect breathing, causing a decline in lung function and lead to this symptom, a little activity will be more serious. It is also easy to be caused by various reasons affecting the heart function, such as heart valve disease and heart failure, often do not exercise, a little activity will also have this feeling, there are other chronic diseases, as long as it affects the heart and lung function, most of them will cause this symptom. It is necessary to actively treat the original disease, but also need to properly exercise to enhance physical fitness and strengthen the heart and lung function.