Stenting, also called percutaneous coronary intervention, is a treatment method to reconstruct blood flow in narrowed or blocked coronary arteries under the guidance of coronary angiography by means of special catheters, guide wires, stents and so on. It is one of the most common and mature interventional techniques for the treatment of coronary artery disease, but after all, it is a kind of surgery, and its hazards are as follows: 1. cardiac arrest; 2. new acute myocardial infarction; 3. cerebral hemorrhage and cerebral thrombosis; 4. hematoma, arterial entrapment, pseudo aneurysm, arteriovenous fistulae and so on at the site of puncture; 5. allergy to the contrast medium and causing renal insufficiency; 6. vagal reflex, which is manifested by blood pressure Drop, palpitation, sweating, etc.; 7, stent dislodgement; 8, restenosis that occurs within 6 months after the operation; 9, excessive medical treatment, put extra stents for patients, resulting in economic and mental pressure on patients, while long-term use of anticoagulants leads to gastrointestinal discomfort, bleeding, etc., the side effects of such drugs also exist after normal stenting; 10, a small number of people with localized discomfort in the heart, most of which is related to mental factors, and gradually adapts after about a year. A small number of people experience localized cardiac discomfort, which is mostly related to mental factors and gradually adapts after about one year. Although there are many hazards and risks associated with stenting, the most common ones are local hematoma and vagal reflex, which are generally not a big problem, and serious complications are extremely rare. The technology and conditions in hospitals that can perform stenting are very mature, so the risks of the procedure are minimal and there is no need to be overly concerned.