Myocardial ischemia may be characterized by a rapid heart rate, but it is not the only symptom, and symptoms such as chest tightness and chest pain may also occur. The cause of myocardial ischemia can be atherosclerosis, stenosis, embolism, etc. The more common symptoms of myocardial ischemia include tightness in the chest, chest pain, pressure and oppression at the back of the sternum, discomfort in the back of the shoulders, rapid heart rate, dyspnea, and profuse sweating. Often the onset of symptoms can be preceded by triggers such as activity, a full meal, or agitation, and can last anywhere from a few minutes to a few hours. If only temporary myocardial ischemia. Symptoms can be relieved with rest or nitroglycerin. If the above symptoms continue to be unrelieved please seek immediate medical attention. Myocardial ischemia can also occur in some digestive and respiratory diseases, which need to be differentiated. If symptoms persist without effective relief, consult a doctor to avoid life-threatening situations.