Chlamydia can be passed from person to person during vaginal, anal, and oral sex with someone who has the infection. It can infect the genitals, anus (bottom), urethra (urine passage), cervix (opening of the uterus), throat, and eyes.
You may not know you have chlamydia unless you get an STI test. Even if you don’t have any symptoms, you can still pass chlamydia on to others. Chlamydia can cause serious health problems if untreated, including:
- Pelvic inflammatory disease (PID) – infection of the womb and fallopian tubes
- Painful swelling of the testicles (balls)
- Ectopic pregnancy – pregnancy outside the uterus
- Infertility – inability to become pregnant
