Catheter does not flow urine may be due to urinary catheter blockage, folding, etc. It can be relieved by urinary catheter flushing, replacement of urinary catheter, and adjustment of position. 1. Urinary catheter blockage: The most common cause is catheter blockage, especially in patients with long-term indwelling catheters. Coupled with drinking less water, there will be more urinary scale, urine infection and so on. It is easy for the catheter to become blocked, and this is when you need to see a medical professional to replace the catheter again. If there is a blood clot in the urinary catheter blocking the catheter. At this point, you can try to flush the catheter with sterile saline. If you still can not pass urine, you should replace the catheter in time. 2. Folding of the urinary catheter: The position of the catheter may be inappropriate, such as the length of the reserved tube is too long, resulting in the folding of the tube, but also due to the urinary catheter in the thigh below the pressure and other factors that lead to the inability to drain. Timely adjustment of the position of the urinary catheter can improve the situation. Failure of catheter drainage can also be seen in other reasons, if the appropriate adjustment of the position can not be improved, it is recommended to inform the medical staff in time to deal with, do not pull without authorization, to avoid urethral injury, infection and other situations.