In the United States, more than one million women are affected by PID each year, and the rate is highest among teenagers. Approximately 50,000 women become infertile in the US each year from PID 
The commonest symptoms of PID are pain in the lower abdomen and abnormal vaginal discharge. Other symptoms that may sometimes be noticed include fever, painful intercourse, or irregular menstrual bleeding. However it is important to note that PID can occur and can do serious harm without causing any noticeable symptoms.
Although the PID infection itself may be cured, effects of the infection may be permanent.
PID can cause scarring inside the reproductive organs, which can later cause serious complications, including chronic pelvic pain, difficulty becoming pregnant, ectopic pregnancy (tubal pregnancy)(when the fetus begins to grow in the fallopian tube instead of the uterus. Ectopic pregnancy can be fatal), and other dangerous complications of pregnancy.
Important ways to avoid PID include:
- Using condoms
- Going to the doctor immediately if you experience symptoms of PID, symptoms of sexually transmitted disease, or if you learn that a sex partner has, or might have had, sexually transmitted disease.
- Getting regular gynecological (pelvic) exams (important because you might not notice any symptoms of PID, even if you have it).
 "Chlamydia: What Young Women Need to Know" http://www.nutricise.com/servlet/article/5829.html
- Fact sheet on Pelvic Inflammatory Disease from the National Institute of Allergy and Infectious Disease. http://www.niaid.nih.gov/factsheets/stdpid.htm