If left untreated, chlamydia can lead to other, sometimes serious, health problems.
In women, untreated chlamydia cause pelvic inflammatory disease (PID). PID can cause pelvic pain, infertility (inability to get pregnant), and ectopic pregnancy (pregnancy outside the uterus) which can be life-threatening. PID can be treated with antibiotics.
In men, untreated chlamydia can cause swelling in the epididymis (the tubes that carry sperm from the testicles) and the testicles. Rarely, it can cause infertility in men.
Chlamydia can also cause reactive arthritis in both women and men – inflammation of the joints, and in some people, the urethra and the eyes (conjunctivitis).