PID (Pelvic Inflammatory Disease) — Symptoms, Treatment, Recovery

Pelvic inflammatory disease (PID) is what happens when an STI — usually chlamydia or gonorrhea — moves up from the cervix into the uterus, fallopian tubes, and ovaries. It's the major preventable cause of female infertility and ectopic pregnancy in the US.

PID can be loud and obvious — or so subtle it's missed for years. Here's the practical picture.

The short answer

  • What it is: Infection of the upper female reproductive tract
  • Main causes: Chlamydia (40%), gonorrhea (30%), Mycoplasma genitalium, bacterial vaginosis, mixed bacteria
  • Symptoms: Pelvic pain, fever, abnormal bleeding, discharge, painful sex — though many cases are subtle
  • Diagnosis: Clinical exam + STI testing + sometimes imaging
  • Treatment: Antibiotics for 14 days minimum
  • Long-term risks: Infertility (10-20% per episode), ectopic pregnancy (6-9x increase), chronic pelvic pain (10-20%)
  • Prevention: Annual STI screening, treat infections promptly, partner treatment

What PID looks like

Classic acute PID

  • Lower abdominal/pelvic pain — both sides, sometimes severe
  • Fever (sometimes mild, sometimes 101+)
  • Painful sex (deep dyspareunia)
  • Bleeding between periods or after sex
  • Abnormal vaginal discharge
  • Painful urination
  • Nausea, vomiting in severe cases
  • Sometimes lower back pain

Subtle ("silent") PID

  • Many cases have mild or no recognized symptoms
  • Often diagnosed retroactively (infertility workup, ectopic pregnancy)
  • Particularly common with chlamydia
  • "Silent PID" still causes long-term damage

Severe PID — emergency

  • Severe pain
  • High fever
  • Sepsis-like symptoms
  • Tubo-ovarian abscess (collection of pus)
  • Requires hospitalization

How PID develops

Normal vaginal/cervical bacteria don't usually cause PID. The classic path:

  1. STI (chlamydia or gonorrhea) acquired
  2. Bacteria ascend from cervix through endometrium
  3. Reach fallopian tubes (salpingitis)
  4. Can affect ovaries and pelvic peritoneum
  5. Inflammation and scarring develop

Risk factors that increase PID:

  • Multiple partners
  • New partner (within past 60 days)
  • Age under 25
  • IUD insertion (small short-term risk)
  • Vaginal douching (disrupts barriers)
  • Smoking
  • Previous PID (increases recurrence)

Diagnosis

Clinical diagnosis is primary

CDC recommends empiric treatment when you have:

  • Lower abdominal/pelvic pain
  • One or more of:
    • Cervical motion tenderness (cervix tender on bimanual exam)
    • Uterine tenderness
    • Adnexal (ovary/tube area) tenderness

Supporting tests

  • NAAT for chlamydia and gonorrhea (urine, vaginal, rectal as appropriate)
  • CBC — elevated white count
  • CRP or ESR — elevated inflammation markers
  • Pregnancy test (to rule out ectopic)
  • Pelvic ultrasound — may show fluid in tubes, abscess, or be normal
  • Wet mount — checks for trichomoniasis, BV, gonorrhea

When imaging is needed

  • Severe symptoms
  • Suspected tubo-ovarian abscess
  • Failure to respond to outpatient antibiotics
  • Pregnancy with possible PID
  • Ectopic pregnancy concern

Treatment

Outpatient regimen (most cases)

  • Ceftriaxone 500 mg IM single dose (for gonorrhea coverage)
  • Doxycycline 100 mg twice daily for 14 days (chlamydia + Mgen coverage)
  • Metronidazole 500 mg twice daily for 14 days (anaerobic coverage; especially if BV concern)

Inpatient regimen

  • Indicated for:
    • Pregnancy
    • Severe illness
    • Cannot tolerate oral medications
    • Failure of outpatient treatment
    • Tubo-ovarian abscess
    • Other complicating conditions
  • IV antibiotics until improvement, then complete with oral

After 14 days

  • Re-evaluate symptoms
  • Re-test for STIs at 3 months
  • Continue follow-up

Why 14 days matters

The reason PID treatment is 14 days (not 7 like uncomplicated chlamydia):

  • Deep tissue infection harder to clear
  • Multiple organisms may be involved
  • Reduces recurrence
  • Better fertility outcomes when fully treated

Don't stop early because symptoms improve.

Partner treatment

  • Male partners from past 60 days should be tested AND treated
  • Treatment for them is shorter (chlamydia + gonorrhea coverage)
  • Female partners also need treatment if applicable
  • All partners need treatment even if asymptomatic

Long-term consequences

Infertility

  • 10-20% per single episode of PID
  • Doubles with each subsequent episode
  • Caused by fallopian tube scarring (hydrosalpinx)
  • IVF can help in many cases
  • Early recognition + treatment reduces but doesn't eliminate risk

Ectopic pregnancy

  • 6-9x higher risk after PID
  • Caused by damage to tubes preventing normal egg passage
  • Can be life-threatening if not caught
  • Important to seek care for early pregnancy bleeding/pain

Chronic pelvic pain

  • 10-20% develop chronic pain
  • Caused by adhesions, scarring
  • Can require specialized pain management
  • Sometimes laparoscopic adhesiolysis helps

Tubo-ovarian abscess

  • 2-10% of PID develops into TOA
  • Collection of pus in tubes/ovary area
  • Requires IV antibiotics + sometimes surgical drainage
  • Hospitalization needed

PID and fertility

If you've had PID and are trying to conceive:

  • Tubal patency testing (HSG or sonohysterogram)
  • Consider early referral to reproductive endocrinology
  • IVF may be needed if tubes blocked
  • Pregnancy may still occur naturally in many cases

PID in special populations

IUD users

  • Brief risk increase right after IUD insertion (3 weeks)
  • Once past first 3 weeks, IUD doesn't increase PID risk
  • If PID develops with IUD in place: treat — IUD often kept; remove if not responding

Pregnancy

  • PID during pregnancy is rare but serious
  • Requires hospitalization
  • Aggressive treatment

Postpartum

  • Postpartum endometritis is similar but distinct
  • Different bacterial pattern
  • Different treatment

HIV+ patients

  • Higher rates of severe PID
  • More likely to need hospitalization
  • Standard treatment, longer recovery

What if PID treatment doesn't work?

Re-evaluate:

  • Was treatment compliance adequate?
  • Possible resistant organism?
  • Tubo-ovarian abscess developing?
  • Alternative diagnosis?
  • Surgical intervention needed?

Consider:

  • Repeat imaging
  • Different antibiotic regimen
  • Infectious disease or gyn consultation
  • Hospital admission

Prevention

Primary prevention

  • Annual STI screening for sexually active women under 25
  • Annual screening for women 25+ with risk factors
  • Condoms for STI risk reduction
  • Partner treatment when one partner is positive
  • Limit partners when possible

Secondary prevention

  • Treat STIs promptly — don't delay
  • Complete antibiotic course for any STI
  • Don't have sex during STI treatment
  • Re-test at 3 months after treatment

Tertiary prevention

  • Recognize PID symptoms early if you've had STIs
  • Don't ignore pelvic pain
  • Get evaluated quickly for symptoms suggestive of PID
  • Complete PID treatment fully

When to see a doctor urgently

  • Severe lower abdominal pain
  • Fever + pelvic symptoms
  • Heavy bleeding with pain
  • Vomiting + abdominal pain
  • Suspicion of pregnancy + bleeding

Emergency rooms can handle PID. Don't wait for primary care if symptoms are severe.

What to ask your doctor

"What's your suspicion for PID?"

"Are we treating empirically for PID, or waiting for results?"

"What STI tests are you running?"

"If PID, what's the antibiotic regimen and how long?"

"When should I follow up?"

"What about my partner?"

"What's my long-term fertility outlook?"

Common misconceptions

"PID only affects women who are sexually promiscuous." False. It can happen after any STI exposure, including from a long-term partner who has an undisclosed STI.

"If I had PID, I can't have kids." Not necessarily — many women with past PID conceive successfully.

"My pelvic pain is normal — I don't need to worry." New persistent pelvic pain should be evaluated. PID is treatable when caught early; chronic damage if missed.

"PID is rare." About 1 million US cases per year. Not rare.

"My IUD caused my PID." Probably not — modern IUDs only have brief increased risk right after insertion. PID with an IUD in place is usually from an STI, not the IUD.

Bottom line

PID is:

  • Common — about 1 million US cases per year
  • Caused mostly by untreated chlamydia and gonorrhea
  • Preventable with STI screening and prompt treatment
  • Treatable with 14 days of antibiotics
  • Has long-term consequences if untreated or recurrent (infertility, chronic pain, ectopic risk)
  • Often missed because subtle cases lack obvious symptoms

If you have pelvic pain + STI risk factors, don't wait. If you've had any STI in the past year, watch for pelvic symptoms. Annual screening prevents most cases.

For more, see chlamydia symptoms in women, gonorrhea symptoms in women, STI screening intervals, and our chlamydia pillar guide.