Angina pectoris is a medical term, the symptoms and performance mainly include the following aspects: 1, pain, such as manifested as a feeling of stuffiness behind the sternum, can also manifest neck tightness, can also manifest chest girdle feeling, and even some patients can manifest as toothache, jaw pain, or left back pain and left upper arm pain. 2, angina performance can vary greatly from patient to patient, a part of patients with severe angina pectoris Some patients with severe angina can show a series of performance such as heavy sweating, weakness, or even nausea and vomiting along with the above symptoms. For patients with the above-mentioned symptoms, they should undergo ECG examination as soon as possible to clarify or exclude heart attack or angina pectoris.