What causes PID?
The most common cause of PID is a sexually-transmitted infection which has spread from the lower genital tract. Common causative organisms include:
- Chlamydia trachomatis (14-35% cases)
- Neisseria gonorrhoeae (2-3% cases)
- Mycoplasma genitalium
PID can also be caused by normal vaginal flora which migrate to the upper genital tract4.
Often no pathogen is identified.
Learning bite: Pathogen negative PID is common.