When the heart is deprived of oxygen, it manifests itself in the following symptoms: first, chest,. The most common is located behind the sternum, the nature of the burning sensation, squeezing feeling, will radiate to the shoulders or arms, after resting or containing nitroglycerin, fast-acting heart pills and other drugs, can be relieved. Second, chest tightness, the heart lack of oxygen when the performance is not pain but boring, chest tightness episodes are mostly related to activities, symptoms appear, if you do electrocardiogram will see the heart blood supply is insufficient. Third, other symptoms, the attack of angina pectoris, the performance is not chest pain and chest tightness, but symptoms other than the heart, such as toothache, sore throat, epigastric pain, if the pain is related to the activity, timely review of the electrocardiogram, a clear diagnosis.