After ureter removal, many patients will have the inability to urinate, which is also very common in the clinic, what exactly is the cause? In fact, there are still more reasons for the inability to urinate on their own after ureter removal, mainly divided into hypospadias and bladder outlet obstruction. There are also differences between men and women. Male prostate enlargement is a common disease that can produce urinary retention in severe cases, causing difficulty in urination, and catheterization is also the key to treatment. Due to long-term difficulty in urination, most patients have reduced function of the forceps muscle. During the process of carrying the urinary catheter, the forceps muscle is in a state of inactivity, and when the catheter is suddenly removed, the contraction of the forceps muscle does not respond well, and it becomes impossible to urinate. In addition, prostate enlargement can also cause bladder outlet obstruction, and the urinary catheter will stimulate the prostate gland, causing edema and increasing the obstructive symptoms of the prostate gland, and also the inability to urinate after the removal of the urinary catheter. The majority of women undergoing catheterization are seen in maternal deliveries or older women. The above-mentioned decompensation of the detrusor muscle is also a common cause. After carrying a urinary catheter for a period of time, the bladder neck of a woman may also become spastic and unable to urinate on its own after removal of the catheter. In summary, the inability to urinate on one’s own after removal of the urethral catheter is mostly caused by the decompensation of the forceps urinis muscle. It is recommended to exercise the function of the forceps urinis muscle before removal of the urethral catheter and to clip the urethral catheter regularly before removal, which can reduce the occurrence of inability to urinate on one’s own after removal of the urethral catheter.