The risk of cardiac bypass surgery cannot be generalized, but is mainly related to the maturity of the technique and the disease itself. Cardiac bypass surgery requires general anesthesia, chest opening and extracorporeal circulation, and is a major surgical procedure that carries a certain degree of risk. With the advancement of technology, cardiac bypass surgery has become more sophisticated, and its risks have been controlled. However, there are risks of anesthesia accidents, intraoperative or postoperative bleeding, cardiac arrhythmia, cardiac arrest, and so on. Therefore, even though the risk of cardiac bypass surgery is currently low, it is important to communicate fully with your doctor before surgery to understand the risks of the surgery, maintain a calm mindset, actively cooperate with the doctor’s examination and correct bad lifestyle habits, so as to reduce the risk of the surgery.