Cardiac stent belongs to a kind of PCI (Percutaneous Coronary Intervention), the treatment is significant, although there are surgical complications and hazards but the probability of occurrence is relatively low, and should not be abandoned for treatment, the hazards of cardiac stent include skin bruising, thrombosis and so on. 1. Cardiac stenting is a procedure in which a balloon catheter is inserted into a narrowed blood vessel through a puncture in the blood vessel, and the balloon is inflated under pressure to open up the narrowed blood vessel wall and restore the blood supply to the diseased vessel, thereby treating atherosclerosis. As the puncture is made through the skin, bruising and pain may occur on the skin, and blood tests, coagulation tests, etc. are needed to treat the symptoms. 2. Cardiac stents also lead to thrombosis. The main material of the stent is stainless steel, nickel-titanium alloy or cobalt-chromium alloy, which is a foreign body to the heart, and may lead to the formation of thrombus if there is no timely antiplatelet therapy after the stent is put in. Generally, dual antiplatelet therapy is required within one year after stent placement: aspirin and tegretol (or clopidogrel). It is recommended to choose the treatment plan under the guidance of a doctor. The overall incidence of adverse effects of cardiac stents is low, and cardiac stents should not be avoided just because of the harm they can cause.