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Chlamydia is a common STI caused by the bacterium Chlamydia trachomatis.

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Symptoms of chlamydia most commonly include painful urination, pain in the pelvic region and testes, and vaginal or penile discharge.

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Newborns may become infected in the birth canal, and as a result develop respiratory tract infections and a form of conjunctivitis (infection of the conjunctiva) called trachoma, which can lead to blindness.

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In women, untreated chlamydia can spread into the uterus and uterine tubes and cause pelvic inflammatory disease (PID), which scars the uterine tubes. Scar tissue may prevent fertilization by completely blocking sperm, resulting in infertility, or it may partially block the uterine tube, preventing a fertilized ovum from moving into the uterus and causing it to implant in the uterine tube

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Even though it is easily treated with antibiotics, an estimated 3 million chlamydial infections occur annually in the United States.