What happens to the fallopian tube if you have chlamydia?

Tubal blockage. If chlamydia goes untreated and effects the tubes, it can cause scarring and blockage of the tubes leading to infertility. However, if treated early and properly, it shouldn't cause any problems.
Early treatment best. Chlamydia is an infection that can damage the fallopian tubes. Fortunately, if caught early, there are few ill effects. Infections that are not treated can result in pelvic inflammatory disease and blocked fallopian tubes.