If patients have frequent inability to get air, there are several reasons: 1, the most common reason is cardiogenic factors, such as patients with coronary heart disease, unstable angina, myocarditis, pericarditis, congenital heart disease, dilated cardiomyopathy, hypertrophic obstructive heart disease. These conditions can cause ischemia, spasm and stenosis of the coronary arteries, causing patients to have insufficient blood and oxygen supply to the myocardial cells, resulting in inability to get air. 2, respiratory system diseases, especially chronic respiratory diseases, such as chronic bronchitis, chronic bronchiectasis, chronic obstructive pulmonary emphysema, chronic pulmonary hypertension, these conditions will also have patients feel that they often can not get air. 3, plant nerve dysfunction The patient with cardiac neurosis will also experience frequent inability to get air. 4, women who are in menopause or around puberty, because of the endocrine system disorders in the body will also have the above clinical manifestations.