A urinary catheter is required for performing lung nodule surgery. Currently, surgical treatments for lung nodules mainly include traditional open thoracotomy and thoracoscopic surgery, which mainly performs anatomical lobectomy and lymph node dissection of the diseased lung. Thoracoscopic surgery has become the mainstream surgical method nowadays due to small incision, fast recovery and good results. Regardless of the surgical option used, it is performed under general anesthesia. On the one hand, due to the long duration of the surgery, ranging from about 4 to 6 hours, under general anesthesia, the patient is unable to pass urine, which will cause overfilling of the bladder, resulting in acute urinary retention, and in severe cases, the bladder may be propped up. On the other hand, during surgery, more fluids will be fed to the patient to maintain effective circulating blood volume, which will also result in more urine. Not only do you need to insert a urinary catheter during lung nodule surgery, but you should also carry a urinary catheter for a period of time after surgery to facilitate better recovery.