Thrush: why it keeps coming back and how to clear it for good
Last updated September 3, 2026.
Thrush is an overgrowth of a yeast called Candida that normally lives harmlessly on the body. Given the right conditions (antibiotics, hormonal shifts, tight synthetic clothing, uncontrolled blood sugar), it multiplies and causes itching, soreness, and discharge. It is common, treatable with simple antifungals, and very good at coming back if the underlying trigger stays.
What does it feel like?
In women: intense vulval and vaginal itching and soreness, a thick white discharge often compared to cottage cheese (usually without much smell), redness and swelling, and stinging when passing urine or during sex. In men: redness, itching, and irritation under the foreskin or on the head of the penis, sometimes with a discharge. Thrush can also appear in the mouth (white patches on the tongue and inner cheeks) and in skin folds, especially in babies and people who wear dentures.
Is it definitely thrush?
Thrush discharge is thick, white, and not smelly. That detail matters: a thin, grey, fishy-smelling discharge points toward bacterial vaginosis, and frothy or yellow-green discharge points toward infections that need different treatment entirely. First-ever symptoms, symptoms during pregnancy, or symptoms that keep returning despite correct treatment all deserve a proper swab rather than another round of guesswork.
What actually clears it?
- Antifungal treatment: clotrimazole pessaries or cream for vaginal thrush, or a single-dose oral fluconazole tablet; both are effective, and oral is not suitable in pregnancy. Cream on the outside skin settles the itch faster.
- Complete the course: stopping the moment the itch fades is the most common reason it returns within weeks.
- Reduce the triggers: loose cotton underwear, no perfumed soaps or washes on the genitals, no douching, and changing out of wet swimwear or gym kit promptly.
- Partners: thrush is not classed as a sexually transmitted infection and treating a symptom-free partner does nothing, but a partner with symptoms needs treatment too.
- Recurrent thrush: four or more episodes in a year needs a clinician: longer suppressive treatment works, and blood sugar should be checked.
When is it an emergency?
Thrush itself never is. But pelvic pain, fever, foul-smelling discharge, bleeding between periods, or sores and blisters are not thrush symptoms and need assessment, as do thrush symptoms in pregnancy or recurrent thrush that will not stay cleared. Pymander's escalation routing is built and tested specifically for this class of decision; see the safety architecture working paper.
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Common questions
Is thrush a sexually transmitted infection?
No. Candida already lives on most people's bodies without causing trouble; thrush is an overgrowth, not something you catch. Sex can trigger it (friction, and semen briefly changing vaginal pH) and partners can pass symptoms back and forth, but it does not count as an STI and treating a symptom-free partner achieves nothing. Recurrent symptoms after sex are still worth a swab, because some STIs can mimic thrush.
Why do antibiotics cause thrush?
Antibiotics kill bacteria indiscriminately, including the protective lactobacilli that keep vaginal yeast at low levels. With the competition gone, Candida multiplies. The same logic applies to steroid inhalers (oral thrush: rinse your mouth after each puff) and to any situation that suppresses normal flora or immunity. If you reliably get thrush after antibiotics, tell the prescriber: a simultaneous antifungal can be sensible for repeat sufferers.
Can I treat thrush in pregnancy?
Yes, but the choice of treatment changes: oral fluconazole tablets are avoided in pregnancy, while clotrimazole pessaries and cream are considered safe, ideally inserted with fingers rather than the applicator in late pregnancy. Untreated thrush late in pregnancy can pass to the baby during delivery and cause oral thrush in the newborn, so treating it is worthwhile. Any thrush symptoms in pregnancy deserve a mention to your midwife rather than purely self-treating.
Why does my thrush keep coming back?
Four or more episodes a year is called recurrent thrush and affects roughly 1 in 10 women at some point. Common drivers: incomplete treatment courses, tight synthetic clothing, perfumed products, uncontrolled or undiagnosed diabetes, and being on the combined pill or HRT. Recurrent thrush deserves a swab to confirm it really is Candida (some yeast species resist standard treatment), a blood sugar check, and usually a longer suppressive course, such as weekly fluconazole for six months, supervised by a clinician.
Can men get thrush?
Yes. It shows up as redness, itching, and soreness on the head of the penis or under the foreskin, sometimes with a discharge or difficulty pulling the foreskin back. Men with diabetes are more prone to it. Treatment is the same antifungal cream, usually clotrimazole applied twice daily for one to two weeks, plus careful daily washing and drying. Recurrent thrush in men is another reason to check blood sugar.
Do thrush home remedies like yoghurt or vinegar work?
The evidence for them is weak, and some actively backfire. Live yoghurt is harmless eaten but there is no good trial support for applying it; vinegar douches and tea tree oil irritate already inflamed skin and disrupt the flora further; and douching of any kind makes thrush worse, not better. Antifungal pessaries and tablets are cheap, available over the counter, and finish the job in days, so they remain the sensible route.