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How can gonorrhea or chlamydia lead to fallopian tube scarring?

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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 lead to fallopian tube scarring primarily by causing pelvic inflammatory disease (PID). When these sexually transmitted infections are left untreated, the bacteria can spread from the cervix or uterus into the upper reproductive tract, including the fallopian tubes.123

This infection triggers an inflammatory response in the pelvic cavity. As the body attempts to fight the bacterial invasion, the resulting inflammation can damage the delicate tissues of the fallopian tubes. Over time, this process leads to the formation of scar tissue and potential blockages within the tubes.142

Because the fallopian tubes serve as the essential passageways for sperm to reach the egg and for the fertilized egg to travel to the uterus, this scarring can obstruct these functions, often resulting in infertility. Furthermore, such damage increases the risk of ectopic pregnancies, where a fertilized egg implants outside the uterus. Prompt diagnosis and antibiotic treatment are essential to clear the infection and prevent this permanent damage.2413