Vaginal Odor
A change in vaginal odor is genuinely common and, most of the time, comes down to a shift in the normal bacterial balance rather than an STD — but one specific STD does cause a similar smell, which makes this worth sorting out rather than guessing.
The most common non-STD cause
Bacterial vaginosis (BV) is the single most common cause of a distinct, often described as "fishy," vaginal odor — particularly noticeable after sex. It's a shift in the vaginal microbiome, not an STD, though sexual activity is a recognized risk factor for it. It often comes with a thin, grayish discharge alongside the odor.
The STD that causes something similar
Trichomoniasis can cause a noticeable, sometimes unpleasant odor alongside itching, burning, and a frothy or unusually colored discharge — similar enough to BV that the two are genuinely easy to confuse without testing. Since trichomoniasis isn't always included in a "basic" STD panel by default, it's worth specifically confirming it's covered if odor is your main symptom and a BV treatment hasn't resolved it.
When It's Worth Testing
A new or unusual odor that doesn't resolve with standard BV treatment, or that comes with itching, burning, or unusual discharge, is worth testing for trichomoniasis specifically rather than assuming it's BV again.
Related Testing Topics
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