There is a slight pain in the urethra during the insertion of the indwelling catheter. Because the catheter needs to pass the full length of the urethra, women experience less pain, while men experience slightly more pain than women. In women, the urethra is relatively short and straight, and there is no obvious urethral stricture, so there is no obvious blockage that causes pain during insertion, while in men, the urethra is relatively long, with a length of about 17-22 cm, and there are three strictures in the male urethra, so there is local pain during the passage of the catheter through the three strictures. However, the pain is often mild and generally tolerable, but for older men the pain during catheterization is slightly more severe than in young men. Because older men may have varying degrees of prostate enlargement, the enlarged prostate can cause the urethral lumen to become thinner, which increases the resistance during catheterization and makes the pain slightly worse during catheterization. The pain will be slightly heavier in men than in women, but the pain is generally tolerable.