The hazards of urethral dilatation are mainly the following: 1, may cause the formation of urethral pseudo-ducts, or bleeding of the urethra, or even haemorrhage; 2, damage other organs, such as male patients damage the bladder, prostate, rectum, female patients can damage the uterus, bladder, rectum, which can seriously lead to bacteremia and sepsis and endanger life; 3, patients with urethral injury, may aggravate urethral injury; 4 , in case of patients with urethral tumor, it can lead to tumor rupture and even tumor dissemination and propagation; 5. It leads to infection of the urethra. Urethral dilation is mainly used to treat urethral strictures and obstruction of the bladder neck caused by various reasons. Urethral dilation can play a therapeutic role in urethral strictures, do not use too fine or too thick urethral probes when dilating, be gentle in your approach and avoid violence to avoid certain hazards.