Side effects of cardiac stent surgery may include symptoms such as thrombosis re-obstruction, bleeding reaction, immune reaction, and decreased cardiac function. 1. Thrombosis and re-obstruction: after cardiac stent surgery, the cardiovascular lining further proliferates, blood lipids gather, and platelets can still form thrombus inside the stent, blocking the blood vessel again. 2. Bleeding reaction: the anticoagulant drugs used after cardiac stent surgery will cause the body’s coagulation function to decrease, which may have the risk of causing gastrointestinal bleeding and cerebral hemorrhage. 3. Immune reaction: stent implantation in cardiac vessels will inevitably destroy the integrity of blood vessels and vascular endothelial cells, no matter what material the stent is made of, it belongs to a foreign body, and the body will reject it while adapting to it, triggering immune reaction of the body. 4. Decrease in heart function: After the stent is installed in the blood vessels of the heart, the compliance of the blood vessels will decrease, affecting the function of the heart. If there are uncomfortable symptoms in cardiac stent surgery, it is recommended to consult a doctor in time and standardize the treatment, so as not to cause adverse consequences.