PID is an infection of the female reproductive organs that can occur when bacteria spreads from the vagina or cervix into the uterus, fallopian tubes, ovaries, and pelvic tissue. Common causes are the bacteria that cause gonorrhea and chlamydia. Symptoms include lower abdominal pain and abnormal vaginal discharge. Without treatment, PID can lead to long-term complications like infertility or ectopic pregnancy. Treatment involves antibiotics to kill the bacteria either orally or intravenously depending on the severity of symptoms. Prevention strategies include screening and treatment of STDs, partner treatment, and safer sex practices.