Chlamydia is a sexually transmitted infection (STI). This means chlamydia is passed from one person to another during sexual contact.
Chlamydia is caused by the bacteria Chlamydia trachomatis. Both males and females may have chlamydia without having any symptoms. As a result, you may become infected or pass the infection to your partner without knowing it.
You are more likely to become infected with chlamydia if you have:
Most women do not have symptoms. But some have:
If you have symptoms of a chlamydia infection, your health care provider will collect a culture or perform a test called a nucleic acid amplification test.
In the past, testing required a pelvic exam by a health care provider. Today, very accurate tests can be done on urine samples or on vaginal swabs a woman can collect herself.
Even if you have no symptoms, you may need a chlamydia test if you:
Chlamydia can be treated with antibiotics. Some of these are safe to take if you are pregnant. Common side effects include nausea, upset stomach, and diarrhea.
Both you and your partner need to take the antibiotics and finish all of them, even if you feel better and still have some left. All of your sexual partners must take the antibiotics, even if they do not have symptoms. This will prevent you from passing the infection back and forth.
Because gonorrhea often occurs with chlamydia, treatment for gonorrhea is often given at the same time.
Antibiotic treatment almost always works if you and your partner take the medicines as directed.
If chlamydia spreads into your uterus, it can cause scarring and make it harder for you to get pregnant. You can help prevent this by:
Make an appointment with your health care provider if you have symptoms of chlamydia.
Centers for Disease Control and Prevention. Recommendations for laboratory-based detection of Chlamydia trachomatis and Neisseria gonorrhoeae, 2014. MMWR 2014;63(No. RR-2):1 - 24.
Centers for Disease Control and Prevention. Sexually transmitted diseases treatment guidelines. 2010. MMWR. 2010;59(RR-12):1-110.
Geisler WM. Diseases caused by chlamydiae. In: Goldman L, Schafer AI, eds. Goldman's Cecil Medicine. 24th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 326.
U.S. Preventive Services Task Force. Screening for chlamydial infection: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2007;147:128-134.
Updated by: Cynthia D White, MD, Fellow American College of Obstetricians and Gynecologists, Group Health Cooperative, Bellevue, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.
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