First, why do you need to stop using aspirin and warfarin before surgery? The reason is very simple, because they are anticoagulant drugs, and stop using them before surgery to prevent bleeding. Second, how long do I need to stop using? Different parts of the surgery, different patient conditions, different bleeding risks, so the time to stop the drug is also different. (i) Warfarin If warfarin is to be discontinued, it is recommended that it be discontinued 5 days before surgery (because according to the pharmacokinetics of warfarin, the coagulation function can return to normal in about 5 days). If warfarin is discontinued preoperatively, it is recommended to restart warfarin within 12-24 hours after surgery. 1. For patients undergoing dental surgery, it is recommended that warfarin therapy be continued before and after surgery, along with oral hemostatic medication, or that warfarin be discontinued 2-3 days before surgery. 2. For patients undergoing skin surgery and cataract surgery, it is recommended to continue warfarin therapy during the perioperative period (i.e., before, during, and after surgery). (ii) Aspirin 1. For patients with secondary prevention of cardiovascular disease, continue aspirin therapy perioperatively for dental surgery, skin surgery, and prostate surgery, rather than discontinuing aspirin for 7-10 days preoperatively. 2. For patients with intermediate or high risk factors for thromboembolism and proposed non-cardiac surgery, it is recommended that aspirin be continued during surgery rather than discontinued 7-10 days before surgery. For patients with low risk of thromboembolism, it is recommended that aspirin be discontinued for 7-10 days. 3. For patients undergoing proposed coronary artery bypass graft surgery, continue aspirin therapy during the perioperative period. 4. For patients who are going to undergo coronary artery bypass graft surgery during dual-antibiotic therapy (aspirin + clopidogrel), aspirin therapy should be continued during the perioperative period (i.e., preoperative, intraoperative, and postoperative), and clopidogrel should be discontinued for 5 days prior to surgery. In conclusion, it is recommended that the risk of thrombotic/bleeding events be thoroughly evaluated under the supervision of a cardiologist in a regular hospital, so that anticoagulant therapy can be appropriately discontinued and resumed.