If you feel pressure in the middle of the sternum, it may be caused by angina pectoris attack. If the symptoms can be relieved by taking nitroglycerin under the tongue or compound danshen drip pills at the time of the attack of uncomfortable symptoms, the occurrence of coronary heart disease and angina pectoris is highly considered. It is best to measure the heart rate and blood pressure during the onset of symptoms, and then do an electrocardiogram (ECG) to help further clarify whether there are any abnormal changes in the ECG. If there is a transient ST segment elevation, consider the occurrence of variant angina pectoris, the occurrence of coronary artery spasm, and if necessary, coronary angiography can be performed to further clarify the severity of the condition. Patients may also be examined with an electrocardiogram, cardiac ultrasound, and chest radiographs, as cardiac ultrasound can help to further exclude hypertrophic obstructive cardiomyopathy and the presence or absence of aortic valve stenosis.