Chlamydia is a common STI. It can lead to Pelvic Inflammatory Disease (PID) and infertility in woman and epididymoorchitis in men if untreated. Up to 70% of women and 50% of men have no symptons of chlamydia. It is easy to treat once detected. Women that do have symptoms may experience an unusual discharge, discomfort or painful intercourse and abnormal bleeding. Men may notice a penile discharge, or redness around their urethra or some pain when urinating.