Chlamydia infections are more serious. Chlamydia includes Chlamydia pneumoniae, Chlamydia psittaci, Chlamydia trachomatis and Chlamydia bovis. About 50% of nongonococcal urethritis is caused by Chlamydia trachomatis, a small, intermediate size between a bacterium and a virus, which usually parasitizes cells and is more destructive to intracellular tissues. Chlamydia trachomatis can cause venereal lymphogranuloma, which can lead to pelvic inflammatory disease, cervicitis and premature labor and miscarriage in pregnant women. Chlamydia trachomatis can also infect infants, resulting in trachoma, Chlamydia trachomatis ophthalmia, and Chlamydia trachomatis pneumonia. Chlamydia trachomatis infection is also prone to cause urethritis in men, patients with chlamydial urethritis will appear urethral tingling, itching, urethral discharge, and urethral syndrome, the patient will appear urethral fever, urinary frequency, urgency, urinary pain, urinary incontinence symptoms. Chlamydia trachomatis infection is more serious and may lead to male and female infertility, resulting in inflammation of the male epididymis and Chlamydia trachomatis epididymitis, leading to spermatogenic dysfunction in the male testes, resulting in decreased sperm viability and affecting the reproductive function. If patients are infected with chlamydia, they should go to the hospital in time and actively cooperate with the treatment so as not to delay the condition.