Chlamydia trachomatis is a microorganism that can cause a variety of diseases after infection, such as trachoma, urethritis, cervicitis, and lymphogranuloma venereum. Trachoma belongs to the category of ophthalmic diseases, also caused by Chlamydia trachomatis infection of the eye, patients may appear conjunctival congestion, tearing and pus discharge and other symptoms, and may lead to conjunctival scarring, inverted eyelashes, and corneal cataracts and other complications. Urethritis caused by Chlamydia trachomatis is a kind of sexually transmitted disease, in the clinic, the patient mainly manifests as urethral purulent discharge, and accompanied by frequent urination, painful urination and other uncomfortable symptoms. Chlamydia trachomatis infection can also lead to cervicitis, mainly through sexual contact transmission, the patient is mainly manifested as a large number of yellow pus-like leukorrhea, may be accompanied by blood. Lymphogranuloma venereum is a sexually transmitted disease caused by a biological variant of Chlamydia trachomatis, which is mainly transmitted through sexual contact, and the patient may have papules and pustules around the genital organs, and may rapidly form erosions and ulcers. It is recommended that patients infected with Chlamydia trachomatis seek prompt medical attention to assess their condition and follow doctor’s instructions for treatment.