The causes of chlamydia infection are as follows: 1, the process of sexual contact caused by infection, which is the most common cause of chlamydia infection, so it is called sexually transmitted diseases. If the contact is not a fixed sexual partner or multiple sexual partners contact, have unclean sexual contact, etc., can increase the probability of chlamydia infection. 2, indirect contact infection, such as the common use of towels with patients, bath products, or contact with the relevant patient’s secretions, may cause chlamydia infection. 3, infection between mother and child, such as the mother suffering from chlamydia infection, during the birth or breastfeeding process can cause chlamydia infection. The best way to eliminate chlamydia is to promote a clean sex life and a sex life with a fixed sex partner. It is important to practice good personal hygiene and to avoid sharing bathing materials with others to avoid increasing the probability of infection.