Chlamydia is the most common sexually transmitted infection in the US. Although it is curable, many people are not aware of the health risks it presents. Up to 70 percent of chlamydia infections in women have no obvious symptoms, so a large number of cases are never diagnosed. The risk is that untreated chlamydia can cause pelvic inflammatory disease, which is the most common cause of female infertility. In a large number of investigations, there is a clear link between chlamydia infection and tubal infertility, whereby the infection causes adhesions and scar tissue to form on the fallopian tubes, causing blockages in the tubes and increasing the risk of complications such as ectopic pregnancy