The typical symptoms of angina are: pain behind the sternum, a crushing and suffocating sensation, pain often triggered by exertion, overwork, excitement, and can be relieved by rest or nitroglycerin; pain can radiate to the inner side of the left shoulder and arm when severe. Some patients only have chest tightness, but it can also be manifested as pain, numbness, heaviness and other discomfort in the neck, dental bed, throat, back, abdomen and arms, so do not be paralyzed.