What is the difference?
Bacterial vaginosis vs Thrush
BV and thrush are the two most common causes of changes in vaginal discharge, and people often assume one when they have the other. BV is a shift in the balance of bacteria, while thrush is an overgrowth of a yeast called Candida.
General information, not medical advice. For advice about your own situation, talk to a clinician, pharmacist or sexual health clinic.
Bacterial vaginosis
Bacterial vaginosis (BV) is a common condition in which the normal balance of bacteria in the vagina shifts, often causing thin grey-white discharge with a fishy smell.
Full entryThrush
Thrush is a common yeast infection caused by an overgrowth of Candida fungi, leading to itching, soreness and sometimes thick white discharge. It can affect the vulva and vagina or the penis.
Full entrySide by side
In short
A fishy smell points more towards BV, itching more towards thrush, but symptoms overlap, so it is worth getting them checked by a pharmacist, doctor or sexual health clinic.
What they have in common
Neither is usually classed as an STI, both are common and treatable, and both can return.
Sources
More comparisons
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Last reviewed 10 October 2026. Spotted a mistake?