The reason for the reduction of angina pectoris symptoms may be, on the one hand, the occurrence and development characteristics of the condition itself, and on the other hand, the effect of active intervention after treatment. Angina pectoris is a group of syndromes caused by acute and temporary ischemia and hypoxia of the myocardium due to insufficient blood supply to the coronary arteries, with paroxysmal and oppressive chest pain as the main symptom, which may radiate to the precordial region and the left upper limb. The reasons for the reduction of angina symptoms may be: 1. The development characteristics of the condition itself, angina pectoris is often paroxysmal, usually lasts a short time, such as stable angina patients pain can be relieved within a few minutes on their own, which is determined by the development characteristics of angina pectoris. Angina stage, myocardial blood supply is compensable, so angina will not continue to attack. 2. The effect of active intervention after treatment. During the acute attack of angina pectoris, if you take bed rest and relax, the pain symptoms will also be significantly improved. Sublingual nitroglycerin or the use of mononitrate drugs, coronary artery dilation, blood flow increases, angina symptoms will also be significantly reduced. It is recommended that patients seek medical attention in a timely manner, under the guidance of a doctor to standardize the treatment, so as to avoid delaying the condition.