Chlamydia infections are often asymptomatic, which means the infection is present but you feel fine. This is especially common for Chlamydia infection involving the rectum (butt), pharynx (throat) and cervix. Chlamydia can still cause problems, even when you feel ok. In women, it can cause inflammation in the reproductive tract that can lead to infertility and increase the risk for an ectopic (tubal) pregnancy. Chlamydia infections can increase the risk of getting or transmitting HIV, especially when additional HIV prevention strategies (like PrEP for people who are HIV negative and treatment for people who are HIV positive) are not used.