A blowing air conditioning on the chest tightness and shortness of breath may be claustrophobia syndrome, coronary artery spasm, coronary heart disease and other causes. 1. claustrophobia: when blowing air conditioning to the room doors and windows closed, claustrophobia patients, in a closed environment may feel chest tightness and shortness of breath. 2. Coronary artery spasm: blowing the air conditioning will lead to a sudden drop in indoor temperature temperature is too low, may cause coronary artery spasm, myocardial ischemia and hypoxia will cause chest tightness, shortness of breath and other symptoms, this is generally physiological, after a few minutes the symptoms will be relieved. 3. Coronary heart disease: patients with coronary heart disease, there is the phenomenon of atherosclerosis, which can lead to narrowing of the arterial lumen, the blood supply to the myocardium can not be properly transported to the myocardium, myocardial ischemia, hypoxia, there will be tightness in the chest and shortness of breath, blowing the air-conditioning temperature is too low may aggravate the symptoms of discomfort. Often blowing air conditioning will have symptoms of chest tightness and shortness of breath, serious cases are recommended to seek medical treatment in a timely manner.