The symptoms of coronary artery stenosis are as follows: 1. chest dullness: the main symptom, manifesting as posterior sternal crush-like or constriction-like pain, which may radiate to the left shoulder and back; 2. toothache and headache; 3. epigastric pain, nausea and vomiting, which are similar to the clinical symptoms of digestive system diseases, and the clinical need to differentiate between the two, commonly used electrocardiogram examination, blood sampling, and checking cardiac enzymes, suggesting cardiovascular diseases; 4. dyspnea; 5. dizziness, weakness and fainting.