Short answer
Pelvic pain sits at the intersection of STI and surgical emergencies: PID (infectious, fertility-threatening) shares every early feature with ectopic pregnancy, appendicitis, and ovarian torsion.
Evaluation is urgent and structured, pregnancy test first, then examination with tenderness mapping, NAAT and infection labs, and ultrasound, never watchful waiting when fever, vomiting, fainting, or pregnancy accompanies pain.
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See Tests & Prices →STI-related patterns. What PID looks like
- PID: bilateral lower-abdominal aching with vaginal discharge, abnormal bleeding, pain during sex, and fever. Often following a new partner, a partner’s STI diagnosis, or a recent procedure that breaches the cervical barrier.
- Cervicitis: milder ache with postcoital bleeding and discharge, the earlier stage before ascent.
- Fitz-Hugh–Curtis syndrome: right-upper-quadrant pain added when inflammation reaches the liver capsule. Sharp pain on breathing that mimics gallbladder disease.
A recent partner STI or new discharge raises pre-test probability sharply; clinicians treat PID on clinical suspicion without awaiting cultures, because tubal scarring accrues during waiting.
Non-STI mimics. Why the pregnancy test comes first
Ectopic pregnancy kills and mimics PID exactly. The urine pregnancy test rules it in or out before anything else.
Appendicitis (migrating pain, anorexia, rebound tenderness), ovarian cyst rupture or torsion (sudden severe unilateral pain with vomiting), endometriosis flares (cyclical pattern), UTIs (frequency, urgency, burning), IBS (bowel-pattern pain), and musculoskeletal pain (positional, reproducible on palpation) complete the differential.
Examination, pregnancy testing, NAAT, and ultrasound triage among them in a single visit; see When Pelvic Pain Needs Urgent Evaluation for the emergency thresholds.
Evaluation path. What happens at the visit
Urine pregnancy test on arrival.
Pelvic examination with cervical-motion, uterine, and adnexal tenderness mapping. The tenderness pattern stages severity.
NAAT for chlamydia/gonorrhea plus HIV/syphilis blood work by risk. Inflammatory markers and urinalysis where indicated.
Transvaginal ultrasound for masses, abscess (tubo-ovarian abscess changes management toward admission), or free fluid.
Treatment starts on clinical criteria the same day; confirmatory results adjust, never delay, therapy.
When to seek care
Emergency for severe/sudden pain, syncope, vomiting, pregnancy with pain/bleeding, or fever with pain; same-day for new pelvic ache with discharge, bleeding, or exposure history.