Thrush in Pregnancy: What’s Safe to Use
Why thrush is more common in pregnancy, which treatments are used and which are avoided, and why being sure it is thrush matters more now than at any other time.
Part of the Complete Thrush Guide.
Key fact: Thrush in pregnancy does not harm the baby, but the treatment changes: topical clotrimazole over a longer course rather than a single oral capsule, since oral fluconazole is avoided. Check with your midwife, GP or pharmacist before using anything, including over-the-counter products.
Why thrush is more common in pregnancy
Thrush is markedly more common during pregnancy, and the reason is hormonal rather than hygienic. Higher oestrogen increases the glycogen content of vaginal cells, which gives yeast more to feed on, and changes in immune function during pregnancy make colonisation easier. It is one of the most frequent reasons for vaginal symptoms in pregnancy and it is not a sign that anything is wrong.
The reassuring part: thrush in pregnancy does not harm the baby, and it does not cause miscarriage or preterm birth. What it does require is different treatment.
What is safe to use
Speak to your midwife, GP or pharmacist before treating thrush in pregnancy — including with anything bought over the counter. Treatment is straightforward, but the choice of medicine genuinely changes.
| In pregnancy | Why | |
|---|---|---|
| Topical clotrimazole | The usual treatment | Acts locally with minimal absorption; well established in pregnancy |
| Length of course | Longer than usual — often around seven days rather than a single dose | Response tends to be slower in pregnancy |
| Applicators | Often advised against; insert by hand instead | To avoid any risk of trauma to the cervix |
| Oral fluconazole | Avoided | Not recommended in pregnancy; topical treatment is used instead |
External clotrimazole cream can be used alongside internal treatment for itching and soreness. If you are breastfeeding rather than pregnant, the picture differs again, so ask rather than assume.
Do not assume it is thrush
This matters more in pregnancy than at any other time, because two of the alternatives have consequences. Bacterial vaginosis is common in pregnancy and has been associated with preterm birth, so it is treated rather than tolerated. Trichomoniasis likewise needs specific treatment. Both produce discharge, and neither responds to antifungals.
| Discharge | Smell | Itch | |
|---|---|---|---|
| Thrush | Thick, white, often like cottage cheese | None | Usually prominent |
| Bacterial vaginosis | Thin, grey or watery | Fishy, often worse after sex | Usually absent |
| Trichomoniasis | Frothy, yellow-green, heavier | Unpleasant | Soreness and irritation |
Our guide to bacterial vaginosis covers the distinction in detail, and the BV condition page covers treatment in pregnancy specifically.
When to seek advice urgently
Contact your midwife or maternity unit the same day if you have vaginal bleeding, any fluid leaking or a sudden change in discharge, abdominal or pelvic pain, fever, burning on passing urine, or reduced movements after 24 weeks. These are not thrush and need assessment rather than treatment at home.
Comfort measures that help
- Wash with water or an unperfumed emollient rather than soap, shower gel or intimate washes
- Avoid douching entirely — it disturbs the vaginal environment and makes recurrence more likely
- Cotton underwear, and avoid sitting in damp swimwear or gym clothes
- Pat dry rather than rubbing, and skip scented wipes, bath products and fabric softeners
- A plain emollient can be used as a barrier to protect sore skin
Thrush around birth and afterwards
Thrush present at delivery can occasionally pass to the baby, usually appearing as oral thrush — white patches in the mouth — which is easily treated and not dangerous. It is worth mentioning any current symptoms to your midwife as you approach your due date.
Afterwards, thrush can affect breastfeeding, causing nipple pain alongside oral thrush in the baby. Both need treating together, and it is a situation to raise with your midwife, health visitor or GP rather than to manage from the pharmacy shelf. Recurrent episodes after pregnancy are covered in recurrent thrush.
Frequently Asked Questions
Can I use Canesten while pregnant?
Topical clotrimazole is the usual treatment for thrush in pregnancy, but you should speak to your midwife, GP or pharmacist before using it, including products bought over the counter. Courses are often longer than the standard single dose, and pessaries are usually inserted by hand rather than with an applicator to avoid any risk of trauma to the cervix.
Can I take fluconazole in pregnancy?
Oral fluconazole is avoided in pregnancy, and topical treatment is used instead. If you have already taken a dose before realising you were pregnant, do not panic — mention it to your midwife or GP, who can advise you properly rather than leaving you to guess.
Does thrush harm the baby?
Thrush in pregnancy does not harm the baby and does not cause miscarriage or preterm birth. It can occasionally pass to the baby during birth, usually appearing as oral thrush — white patches in the mouth — which is easily treated. Bacterial vaginosis is a different matter, which is why it is worth being sure which one you have.
Why do I keep getting thrush now that I am pregnant?
Higher oestrogen increases the glycogen available in vaginal cells, giving yeast more to feed on, and immune changes in pregnancy make colonisation easier. Repeated episodes during pregnancy are common and are not a sign of poor hygiene. They should still be treated with advice rather than repeated over-the-counter courses.
How do I know it is thrush and not something else?
Thrush produces thick white discharge that does not smell, usually with itching. Bacterial vaginosis produces thin grey discharge with a fishy smell and usually no itch, and it matters in pregnancy because it has been associated with preterm birth. Trichomoniasis produces frothy yellow-green discharge. Only the first responds to antifungals, so it is worth checking rather than assuming.
I have thrush and I am breastfeeding. What now?
Thrush can affect breastfeeding, typically causing nipple pain alongside oral thrush in the baby, and both need treating at the same time for either to clear. Speak to your midwife, health visitor or GP rather than treating it from the pharmacy shelf, as the choice of medicine differs while breastfeeding.
References
- NHS. Thrush in men and women. nhs.uk
- NHS. Fluconazole: how and when to take it. nhs.uk
- National Institute for Health and Care Excellence. Clinical Knowledge Summary: Candida — female genital. cks.nice.org.uk
- British Association for Sexual Health and HIV. Guidelines on the management of vulvovaginal candidiasis. bashh.org
- NHS. Bacterial vaginosis. nhs.uk
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Vaginal and genital symptoms have several possible causes and thrush is only one of them. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.