Pelvic Inflammatory Disease (PID)
Understanding PID, a serious infection requiring prompt treatment to prevent permanent reproductive complications
Seek Emergency Care If You Experience:
- β’Severe lower abdominal pain
- β’High fever (>101Β°F/38.3Β°C)
- β’Severe nausea/vomiting
- β’Inability to tolerate oral intake
- β’Signs of shock (dizziness, rapid heart rate, confusion)
Call 911 or go to the nearest emergency room immediately. Do not delay care.
What It Is
Pelvic Inflammatory Disease (PID) is infection and inflammation of the female upper reproductive tract: uterus, fallopian tubes, and ovaries. PID most commonly results from sexually transmitted infections (STIs), especially chlamydia and gonorrhea, that ascend from the cervix and vagina into the uterus and beyond.
PID affects approximately 1 million women per year in the U.S. It is a major cause of infertility, ectopic pregnancy, and chronic pelvic pain. Early diagnosis and treatment are critical to prevent long-term complications.
Why It Matters
Serious Long-Term Consequences:
- Infertility: 10-15% after one episode, risk increases with each subsequent episode
- Ectopic pregnancy: 6-10x increased risk due to fallopian tube scarring
- Chronic pelvic pain: 20-30% develop chronic pain
- Tubo-ovarian abscess (TOA): Life-threatening complication requiring hospitalization
- Fitz-Hugh-Curtis syndrome: Perihepatitis (liver capsule inflammation) in 5-10%
Common Symptoms
Important: Symptoms range from mild to severe. Some women have minimal or atypical symptoms ("silent PID") but still develop complications.
- Lower abdominal/pelvic pain: Most common symptom (90%)
- Abnormal vaginal discharge: Often increased, may be purulent (pus-like)
- Abnormal vaginal bleeding: Intermenstrual bleeding, postcoital bleeding, menorrhagia
- Fever: May or may not be present; fever >101Β°F suggests severe infection
- Painful intercourse (dyspareunia)
- Urinary symptoms: Dysuria, frequency (overlap with UTI/STI)
- Right upper quadrant pain: Fitz-Hugh-Curtis syndrome
Risk Factors
High Riskβββ
- STI history: Chlamydia, gonorrhea (most common causes)
- Multiple or new sexual partners
- Age <25: Adolescents and young women at highest risk
- Prior PID: 20-25% recurrence rate
- Inconsistent condom use
- Douching: Disrupts vaginal flora, allows bacteria to ascend
Lower Risk (Protective Factors)
- β’ Barrier contraception (condoms)
- β’ Oral contraceptives (thicken cervical mucus)
- β’ Monogamous relationship
- β’ Regular STI screening
Why It's Often Missed or Delayed
Diagnostic Challenges:
- Symptom variability: Presentation ranges from asymptomatic to severe
- No single definitive test: PID is clinical diagnosis
- Overlap with other conditions: UTI, appendicitis, ectopic pregnancy, ovarian cyst rupture
- Negative STI tests don't rule out PID: Other organisms (anaerobes, mycoplasma) can cause PID
- Provider hesitancy: Concern about "overdiagnosing" PID, but CDC recommends low threshold for treatment given serious consequences of missed diagnosis
How It's Diagnosed
PID is a clinical diagnosis. CDC recommends empiric treatment if minimum criteria present and no other cause identified. Laparoscopy is gold standard but not practical for routine diagnosis.
CDC Minimum Criteria for PID Treatmentβββ
Begin empiric treatment if sexually active woman with pelvic/lower abdominal pain AND one or more of:
- β’ Cervical motion tenderness on exam
- β’ Uterine tenderness
- β’ Adnexal tenderness
AND no other cause for findings identified.
Additional Supportive Criteria:
- β’ Elevated temperature (>101Β°F/38.3Β°C)
- β’ Abnormal cervical/vaginal discharge
- β’ Elevated ESR or CRP
- β’ Positive gonorrhea or chlamydia test
- β’ WBCs on vaginal wet mount
Testing:
- NAAT for gonorrhea and chlamydia: Essential (cervical or urine)
- Pregnancy test: Rule out ectopic pregnancy
- Wet mount: WBCs on microscopy support diagnosis
- Pelvic ultrasound: If uncertain diagnosis, suspect TOA
- Inflammatory markers: ESR, CRP (often elevated)
When to Suspect Tubo-Ovarian Abscess (TOA):
- β’ High fever, severe pain
- β’ Palpable adnexal mass
- β’ Failure to improve with antibiotics in 48-72 hours
- β’ Requires imaging (ultrasound, CT, MRI) and often hospitalization
Evidence-Based Treatment
Treatment Principles:
- Treat empirically if minimum criteria met - don't wait for test results
- Broad-spectrum antibiotics: Cover gonorrhea, chlamydia, anaerobes
- Partner treatment essential: Treat all recent sexual partners to prevent reinfection
- Abstain from sex until treatment complete and partners treated
- Follow-up in 48-72 hours: Ensure clinical improvement
Outpatient Treatment (Mild-Moderate PID)βββ
CDC 2021 Recommended Regimens:
- Ceftriaxone 500 mg IM x 1 dose
- PLUS
- Doxycycline 100 mg PO BID x 14 days
- WITH or WITHOUT
- Metronidazole 500 mg PO BID x 14 days (adds anaerobic coverage)
Indications for Hospitalization (Inpatient IV Antibiotics):
- β’ Surgical emergency cannot be excluded (appendicitis, ectopic)
- β’ Tubo-ovarian abscess
- β’ Severe illness (high fever, nausea/vomiting, inability to tolerate PO)
- β’ Pregnancy
- β’ Lack of clinical response to oral antibiotics
- β’ Unable to follow or tolerate outpatient regimen
Partner Treatment:
All sexual partners within 60 days must be evaluated and treated for gonorrhea and chlamydia, regardless of symptoms. Expedited partner therapy (EPT) may be option if partner unable to seek care.
Follow-Up:
- β’ Clinical improvement expected within 48-72 hours
- β’ If no improvement: reevaluate, consider hospitalization, imaging for TOA
- β’ Retest for gonorrhea/chlamydia 3 months after treatment (high reinfection rate)
- β’ Counsel on STI prevention, barrier contraception
Prevention
- Consistent condom use: Reduces STI transmission
- Regular STI screening: CDC recommends annual chlamydia/gonorrhea screening for sexually active women <25
- Prompt STI treatment: Treat STIs immediately to prevent ascending infection
- Partner treatment: Ensure partners treated to prevent reinfection
- Avoid douching: Disrupts normal vaginal flora
- Limit number of sexual partners
What This Page Does NOT Replace
- URGENT medical evaluation: PID requires prompt diagnosis and treatment
- Prescription antibiotics: PID cannot be treated without antibiotics
- Partner evaluation and treatment: Essential to prevent reinfection
- Emergency care: Severe PID, TOA require hospitalization
- Fertility evaluation: If concerned about infertility after PID episode
Key Takeaways
- PID is infection of upper female reproductive tract (uterus, tubes, ovaries)
- Most commonly caused by STIs (chlamydia, gonorrhea) ascending from cervix
- Serious long-term consequences: infertility, ectopic pregnancy, chronic pelvic pain
- Diagnosis is clinical - treat empirically if minimum criteria met
- Broad-spectrum antibiotics required; partner treatment essential
- Early treatment critical to prevent permanent reproductive damage
- Prevention: condom use, regular STI screening, prompt STI treatment
Related Resources
Evidence Summary
Well-Established (βββ)
CDC minimum diagnostic criteria, empiric treatment approach, recommended antibiotic regimens, long-term complication rates (infertility, ectopic pregnancy, chronic pain), importance of partner treatment
Emerging Evidence (ββ)
Role of non-STI organisms (anaerobes, mycoplasma) in PID, optimal duration of oral versus IV antibiotic therapy, expedited partner therapy effectiveness
Research Gaps (β )
Best strategies to reduce underdiagnosis of "silent PID," predictors of which women will develop infertility after treatment, optimal screening intervals to prevent recurrence
Last Updated: January 2025