Short answer
Unusual vaginal discharge, changed amount, color, texture, or smell, signals testing, not self-diagnosis.
STIs (chlamydia, gonorrhea, trichomoniasis) share the stage completely with BV and yeast: frothy yellow-green suggests trich, gray fishy suggests BV, clumpy white suggests yeast. Suggestions that orient testing, never diagnoses that direct treatment.
New discharge with exposure history needs NAAT testing plus pregnancy consideration, promptly.
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See Tests & Prices →STI patterns. What each tends to produce
Chlamydia and gonorrhea: mucopurulent yellow-green discharge, sometimes with intermenstrual bleeding or pelvic ache. Though frequently asymptomatic even with visible discharge absent.
Trichomoniasis: frothy yellow-green discharge with odor and itching, often profuse.
All three transmit onward regardless of discharge severity. Heavy discharge is not “more infected” and scant discharge is not reassurance.
Exposure history plus any discharge change triggers testing; see Genital Odor: What It Does and Does Not Mean for the smell companion to this guide.
Non-STI patterns. The overlapping majority
- BV: thin gray discharge with fishy odor (not an STI, but raising STI susceptibility).
- Yeast: thick white clumps with itching and minimal odor.
- Physiologic: cyclical clear-to-white changes with ovulation, pregnancy, and arousal. Normal baselines worth learning so deviations stand out.
Most discharge evaluations end in these categories. Which is reassuring only after testing excluded STIs, never before.
Testing path. What the visit runs
- Pregnancy test (treatment choices and PID risk differ).
- pH, amine/whiff, and microscopy (BV, yeast, trichomoniasis clues in minutes).
- NAAT for chlamydia, gonorrhea, and trichomoniasis (the definitive STI answer).
- HIV and syphilis screening by risk (discharge visits are efficient screening opportunities).
- Recurrent discharge adds M. genitalium and resistant-trich considerations (extended workups for patterns surviving first-line therapy).
Self-care boundaries. Help, don’t hinder
- No douching (worsens every cause and hides signs clinicians need).
- No scented products (irritation plus masking).
- Cotton underwear and breathable clothing.
- No leftover antibiotics or antifungals (partial treatment breeds resistance and obscures diagnosis).
- Track onset relative to periods, new products, new partners, and medications. The timeline orients the clinician faster than any description of color.
When to seek care
Promptly for new discharge with exposure, pelvic pain, fever, or bleeding; urgently for severe pain or pregnancy with symptoms.