Some main causes of pelvic inflammatory disease (PID) are sexually transmitted infections that affect a woman's reproductive organs. The infection can be due to STDs, such as chlamydia and gonorrhea that are caused by bacteria, states Mayo Clinic.
Some other causes of a PID are abortions, miscarriages, or an endometrial biopsy procedure, according to the National Institutes of Health's MedlinePlus. When bacteria enter the cervix through an activity, such as unprotected sex with an infected partner, it can spread to other female reproductive organs, including the ovaries, uterus and Fallopian tubes. Some symptoms of PID are bad cramp during the menstrual cycle, fevers, painful urination, chills, vaginal discharge and pelvic pain or tenderness. However, there may be no signs with a sexually transmitted infection, such as chlamydia.
Because the main causes of PID are sexually transmitted infections caused by bacteria, treatment involves prescribed antibiotics for women. Antibiotic treatment may also be necessary for an infection in sexual partners so women can avoid being reinfected.
According to statistics, about 90 percent of pelvic inflammatory case are due to either chlamydia or gonorrhea infection that are left untreated, as noted by WebMD. Similarly, on a yearly basis approximately one million women in the United States can develop a case of PID. Due to pelvic inflammatory disease, many women can also become infertile. A complication od PID can be scarring of reproductive organs, such as the Fallopian tubes that may cause chronic pelvic pain in some women.