If you do not pay attention to exercise, have obesity, a little activity will appear this phenomenon, is necessary to pay attention to appropriate exercise, also need to pay attention to a light diet to lose weight. If just have this situation, there is no other abnormalities, through appropriate exercise, most of them will be better. With coronary heart disease, myocardial ischemia or lung infection, this phenomenon is also very easy to appear, need to dilate the coronary artery drugs or with effective antibacterial drugs to active treatment, pay attention to rest, avoid overwork. In the elderly or cardiopulmonary function is not good, physical weakness is also easy to cause this phenomenon, first of all to go to the hospital for a comprehensive examination, do routine blood tests, check whether there is anemia, but also need to check the blood pressure and lipids, and then according to the results of the examination and actively use drugs to treat.