Quick read
Key points
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Bacterial vaginosis (BV) is a common condition caused by an imbalance of the natural bacteria in the vagina. It is not a sexually transmitted infection, though it is more common in people who are sexually active. It often causes a thin, greyish-white discharge with a distinct fishy smell, though some people have no symptoms at all.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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You notice an unusual discharge, odour, or irritation, especially during pregnancy
01 · Know
What is Bacterial Vaginosis?
Bacterial vaginosis (BV) is a common condition caused by an imbalance of the natural bacteria in the vagina. It is not a sexually transmitted infection, though it is more common in people who are sexually active. It often causes a thin, greyish-white discharge with a distinct fishy smell, though some people have no symptoms at all.
BV is usually straightforward to treat, but if it develops during pregnancy it is worth mentioning to your maternity team, since it has been linked to a slightly increased risk of preterm labour in some cases.
02 · Understand
Clinical context
It's not caused by poor hygiene
BV results from a natural shift in vaginal bacteria, not from being unclean. In fact, over-washing or using scented products internally can make the imbalance worse.
03 · Act
When to See a Doctor
- 1You notice an unusual discharge, odour, or irritation, especially during pregnancy
- 2Symptoms don't improve after treatment, or keep coming back
- 3You have pelvic pain or fever alongside the discharge
04 · Prevent & manage
Practical steps
Avoid Douching and Scented Products
These disrupt the natural balance of bacteria in the vagina and can trigger or worsen BV.
- 1See a doctor for proper diagnosis.BV is usually confirmed with a simple swab test and treated with a short course of prescribed antibiotics.
- 2Avoid scented soaps and washes.Use plain water or a mild, unscented wash on the outer genital area only.
- 3Wear breathable cotton underwear.This helps maintain a healthy environment and reduces moisture build-up.
- 4Complete the full course of treatment.Even if symptoms improve quickly, finishing the prescribed treatment reduces the chance of it returning.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Bacterial vaginosis ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
BV is common and easily treated — there's no need for embarrassment, and treatment is quick and effective.
If you're pregnant, always let your maternity team know about any unusual discharge so it can be checked.