We know that in the hospital most patients will have a J-tube, also called double J-tube, placed inside their body after surgery. This is a ureteral stent, or J-tube for short, that is placed in every patient after stone surgery. the J-tube has three very important roles: 1) it helps to reduce the fluid retention in the kidneys after the stone surgery; 2) it dilates the ureter, which promotes the discharge of residual small stones from the body; and 3) it is able to effectively prevent adhesions, strictures, infections, and so on, after the surgery. If there are no special circumstances, J-tube should be placed in every case of stone patients after surgery, and the time of placement is usually 2-4 weeks after surgery. In the case of J-tube placement, the vast majority of patients have no significant discomfort, while a small number of patients may experience slight swelling and pain in the lower back, and may experience slight blood in the urine after activity. This is generally normal and not a cause for concern. Patients will be advised to drink more water and minimize their activities so that the discomfort caused by the J-tube can be relieved. Most patients can tolerate the J-tube after the operation without much effect, and they can carry on their normal work and life.