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How can gonorrhea or chlamydia lead to fallopian tube blockage?

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Diagram showing the female reproductive system with labeled ovaries, fallopian tubes, uterus, and vagina, alongside hormone pathways and the process from ovulation to fertilization and early embryo development. — infertility Major structures and hormones involved in the initiation of pregnancy. Also seen, at right, is the development of an egg cell (ovum) from follicle to embryo.

Gonorrhea and chlamydia can lead to fallopian tube blockage by causing pelvic inflammatory disease (PID), an infection of the upper female reproductive tract.12

When these sexually transmitted infections are left untreated, the bacteria can ascend from the cervix or vagina through the uterus and into the fallopian tubes. This bacterial invasion triggers an inflammatory response in the pelvic cavity. As the body attempts to heal from this infection, it often results in the formation of scar tissue within and around the fallopian tubes.132

This scarring can obstruct the tubes, which are the essential passageways for sperm and eggs. When these passages are blocked, it prevents fertilization or the movement of a fertilized egg to the uterus, which is a primary cause of infertility and increases the risk of ectopic pregnancies. Because these infections are often asymptomatic in their early stages, prompt medical diagnosis and antibiotic treatment are ethically vital to prevent permanent reproductive damage.213