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Chlamydia is cause by a bacterial infection called Chlamydia trachomatis. Symptoms may include genital pain and discharge from the vagina or penis. Other symptoms could be eye discharge or spotting. To treat chlamydia, antibiotics are used. An untreated chlamydia infection has been linked to problems during pregnancy, including preterm labor, premature rupture of membranes, and low birth weight. The newborn may also become infected during delivery as the baby passes through the birth canal. Exposed newborns can develop eye and lung infections. Women frequently develop pelvic inflammatory disease (PID). PID can cause infertility (not being able to get pregnant), chronic pelvic pain, tubal pregnancies, and the continued spread of the disease. In men, untreated chlamydia can cause urethral infection and complications such as swollen and tender testicles.