A risk factor is something that increases your chances of getting a disease or condition.
Chlamydia is far more common in women than in men. The risk is highest among adolescents and young adults (generally up to age 25), who are more likely to take risks with their sexual behavior.
Chlamydia cannot be seen, so you cannot tell if someone has it. Since most people are unaware they are infected, chlamydia can get transmitted from person to person without your knowledge.
Other factors that may increase the chances of chlamydia:
Another risk factor for women is cervical ectropion, a condition where cells from inside the cervix are on the outside. Although it usually does not cause problems, it can make you more susceptible to infection.
2015 Sexually transmitted diseases treatment guidelines. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/std/tg2015/default.htm. Accessed January 29, 2021.
Chlamydia—CDC fact sheet (detailed). Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/std/chlamydia/STDFact-chlamydia-detailed.htm. Accessed January 29, 2021.
Chlamydia genital infection. EBSCO DynaMed website. Available at: https://www.dynamed.com/topics/dmp~AN~T114223/Chlamydia-genital-infection . Accessed January 29, 2021.
Mishori R, McClaskey EL, WinklerPrins VJ. Chlamydia trachomatis infections: Screening, diagnosis, and management. Am Fam Physician. 2012;86(12):1127-1132.
Last reviewed March 2020 by
EBSCO Medical Review Board
David L. Horn, MD, FACP
Last Updated: 1/29/2021