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Pelvic inflammatory disease (PID) is a common infection that affects the reproductive organs of women. Marla Ahlgrimm explains that PID is caused by bacteria that spread from the vagina to the uterus, fallopian tubes, and/or ovaries. If left untreated, PID can cause long-term health problems, including infertility. Here, Ahlgrimm touches on the causes, symptoms, and treatment options for PID.