Urethral Chlamydia trachomatis has the possibility of recurrence after one month of negative retesting. Chlamydia trachomatis urethritis has the possibility of recurrence after cure, mainly related to whether timely treatment, whether the combination of other sexually transmitted diseases, autoimmunity. 1. not timely treatment: if the infection is not timely standardized treatment, leading to the pathogen latent in the body, thus causing recurrence. 2. Combination of other STDs: Chlamydia is combined with some other STDs, especially gonorrhea, which makes it more pathogenic and easier to relapse. 3. Autoimmunity: some people with poor physical condition (such as the elderly) have low immunity, which increases the risk of recurrence. They should exercise more, strengthen nutrition, improve immunity, pay attention to personal hygiene, and go to the hospital for regular checkups.