If the patient is currently experiencing a tightness in the chest, it may be caused by an angina attack. It is recommended that the patient take sublingual nitroglycerin or heart pills to help stop the onset of this discomfort. At the same time, it is advisable to measure the heart rate and blood pressure, and it is not advisable to take sublingual nitroglycerin if the blood pressure is low. This is because nitroglycerin is a nitrate drug, which may aggravate hypotension in the process of using it. If the patient has normal blood pressure and rapid heart rate, in addition to sublingual nitroglycerin, he can also take oral metoprolol or propranolol to further improve the discomfort in the precordial region. In addition, it is recommended that the patient should take one step to clarify the diagnosis, such as an ambulatory electrocardiogram, as well as a cardiac ultrasound, chest X-ray, and even coronary CT if necessary, in order to further clarify whether the patient has coronary artery disease and the severity of coronary artery disease.