Chlamydia is a common STD that can infect both men and women. It can cause serious, permanent damage to a woman's reproductive system and can make it difficult or impossible to get pregnant later. Chlamydia can also cause a potentially fatal ectopic pregnancy (pregnancy that occurs outside the womb).
Most people who have chlamydia have no symptoms. When present, symptoms may include abnormal discharge, burning sensation when urinating and for males, pain and swelling in one or both testicles. If you do have symptoms, they may not appear until several weeks after you have sex with an infected partner.
Sexually active woman younger than 25 years should get tested for chlamydia every year. If you are an older woman with risk factors such as new or multiple sex partners, or a sex partner who has an STD, you should get a test for chlamydia every year. Gay, bisexual, and other men who have sex with men (MSM); as well as pregnant women should also get tested for chlamydia.