Heart surgery does not usually cause diarrhea, and patients who develop diarrhea after surgery should be careful to find the cause. The process of heart surgery operation, the gastrointestinal tract is usually not damage, rarely appear diarrhea symptoms. If diarrhea occurs after cardiac surgery, it is important to find the cause and give symptomatic treatment if necessary. Diarrhea after cardiac surgery, may be related to infection factors, such as unhygienic food, pay attention to adjust the diet structure, diarrhea is serious, pay attention to replenish body fluids, if necessary, follow the doctor’s instructions to use anti-infective drugs, such as norfloxacin and so on. Some patients with cardiac surgery during the micro-surgery, may use some drugs, some drugs may produce some adverse reactions, resulting in patients with diarrhea. Drug-induced diarrhea usually gets better on its own and does not require special treatment. Cardiac surgery itself does not usually lead to diarrhea, diarrhea after cardiac surgery should be timely communication with the physician to find the cause of diarrhea, and give timely symptomatic treatment.