Prolonged chest tightness after heart bypass surgery may be caused by irregular life, poor blood circulation, new blood vessel stenosis, etc. It can be treated by adjusting work and rest, taking drugs to improve the blood supply to the heart, and antiplatelet drugs. 1. Irregular life: After heart bypass surgery, if the patient often stays up late at night and eats irregularly, it may increase the load on the heart, resulting in prolonged symptoms of chest tightness. Patients can adjust their daily routine, such as avoiding staying up late and eating a light diet to relieve it. 2. Poor blood circulation: After heart bypass surgery, the blood flow may be too slow, resulting in poor blood circulation, which may cause prolonged chest tightness. It can be treated by taking oral drugs to improve blood supply to the heart, such as clopidogrel bisulfate tablets, aspirin enteric-coated tablets, etc. It is forbidden for those who are allergic to the drug ingredients or have serious liver damage. 3. New-onset stenosis: After heart bypass surgery, new-onset stenosis of blood vessels may occur again, thus causing prolonged chest tightness. Patients can be treated with oral antiplatelet drugs, such as Tegretol tablets, Dipyridamole tablets, etc., which are prohibited for those who are allergic to the drug ingredients. Patients who have undergone cardiac bypass surgery are advised to consult a doctor in time when symptoms of prolonged chest tightness occur, identify the cause of the disease, and then follow the doctor’s instructions to use medication, do not use medication privately, so as not to aggravate the condition.