Pelvic inflammatory disease (PID) refers to ascending pelvic infections beyond the cervix that can involve the fallopian tubes, ovaries, peritoneum or pelvic vascular system. It is often caused by gonorrhea or chlamydia but can be caused by other bacteria as well. Risk factors include multiple sexual partners and unprotected sex. Symptoms include abdominal pain, fever, nausea and abnormal bleeding or discharge. Treatment involves antibiotics, bed rest, pain medication and sometimes surgery for severe or resistant cases. Complications can include infertility, chronic pain and ectopic pregnancy.