The UTI may be related to: 1, urethral injury, resulting in a decrease in the defensive function of the urethral mucosa, thus bacterial growth triggers urethritis. 2, if suffering from prostatitis, vesiculitis, can also cause urethritis. 3, urethral foreign body, if put in the urethra foreign body or stones in the urethra, also easy to trigger urethral infection. 4, unclean sex or usually do not pay attention to personal hygiene, also easy to trigger urethritis. 5, circumcised men are also susceptible to urethritis. The actual fact is that you can find a lot of people who are not able to get a good deal on a lot of things.