The initial damage that chlamydia causes often goes unnoticed. However, chlamydia can lead to serious health problems. If you are a woman, untreated chlamydia can spread to your uterus and fallopian tubes (tubes that carry fertilized eggs from the ovaries to the uterus). This can cause pelvic inflammatory disease (PID). PID often has no symptoms, however some women may have abdominal and pelvic pain. Even if it doesn’t cause symptoms initially, PID can cause permanent damage to your reproductive system. PID can lead to long-term pelvic pain, inability to get pregnant, and potentially deadly ectopic pregnancy(pregnancy outside the uterus). Men rarely have health problems linked to chlamydia. Infection sometimes spreads to the tube that carries sperm from the testicles, causing pain and fever. Rarely, chlamydia can prevent a man from being able to have children. Untreated chlamydia may also increase your chances of getting or giving HIV – the virus that causes AIDS.