You treated it. It cleared up. And now it's back. If you're asking yourself "why do I keep getting thrush?", you're far from the only one.
Thrush that keeps coming back can be linked to things like antibiotics, high blood sugar, irritation or hormonal changes. But many people never find a clear trigger, and that's not your fault.1 Below, we run through five common triggers, what you can do about each, and when it's time to get a GP involved.
Recurring thrush is frustrating, but it's usually harmless. Whether or not a trigger turns up, a GP can help you get it under control.
Why do I keep getting thrush?
Thrush is caused by a yeast called Candida. It normally lives harmlessly on your skin and in your vagina. Problems start when the natural balance shifts and the yeast gets the chance to overgrow.2
Thrush counts as recurring when you get it four or more times in 12 months.1 It's more common than you might think. UK guidelines estimate that around 6 in every 100 women of reproductive age will develop recurring thrush.1 Global estimates are slightly lower, at close to 4 in every 100 women each year.3
There's also a practical cut-off to know about. If you've had thrush more than twice in six months, speak to a pharmacist or doctor before buying another treatment.2
You can read more about the condition itself in our guide to recurring thrush.
Two episodes in six months is the point where a professional should help, not a third pack of tablets. That's where getting to the bottom of it really starts.
1. You've recently taken antibiotics
Antibiotics are one of the most common triggers. They can upset the helpful bacteria in your vagina that keep Candida in check. With fewer of those protective bacteria around, yeast can take over.1
UK guidelines list antibiotic use in the past three months as a risk factor for thrush coming back.1 So if you've noticed thrush after antibiotics more than once, that pattern is worth mentioning the next time you're prescribed a course.
Your GP or pharmacist can talk you through your options. That might mean a different antibiotic where one is suitable, or having a plan ready for treating thrush quickly if it appears.
Do not stop a course of antibiotics early to avoid thrush. Speak to the prescriber or a pharmacist instead.
2. Your blood sugar is running high
Yeast thrives on sugar. When blood glucose stays high, Candida has a much easier time. That's why poorly controlled diabetes is a well-known cause of recurring thrush.1
It isn't only about diagnosed diabetes, either. If thrush keeps returning and you haven't had your blood sugar checked recently, ask your GP for a test.
Some diabetes medicines play a part too. A group called SGLT2 inhibitors, which includes dapagliflozin (Forxiga), works by making you pass extra sugar in your urine. Genital thrush is a common side effect.4
On a diabetes medicine and getting thrush again and again? Tell your GP or diabetes team. You should not stop or change the medicine yourself.
3. Something is irritating the area
Soaps, shower gels, douches and vaginal deodorants can all irritate delicate skin. So can tight underwear or tights. Irritated or damaged skin gives Candida a way in.2
Sex can be a trigger too. Thrush isn't classed as a sexually transmitted infection, but sex can set it off.2 If you keep getting thrush after sex, it's worth avoiding sex until it has fully cleared, especially if sex is uncomfortable.
Partners don't usually need treatment unless they have symptoms themselves.1 One thing to know: antifungal creams can damage condoms and diaphragms, so they may not protect you as they should during treatment.2
Plain water and an emollient instead of soap is one of the simplest swaps you can make. Small changes like this often add up.
4. The last episode didn't fully clear
Sometimes thrush seems to go, but hasn't fully resolved. Thrush should usually clear up within 7 to 14 days of starting treatment.2 If symptoms linger beyond that, Candida can bounce back quickly.
For most people, a single dose of fluconazole is a full course for vaginal thrush. But if your symptoms haven't improved within a week of taking it, speak to a doctor.5 You can find out what to expect in our guide to how fluconazole treats thrush.
It's also possible the cause isn't the usual type of yeast. Some less common Candida species respond less well to fluconazole.5 A swab test at your GP surgery can confirm what's going on and whether a different treatment would work better.
Symptoms that don't respond to treatment may have another cause. A doctor or nurse can examine the area and arrange swabs or other tests if needed.
5. Your hormones are shifting
Oestrogen affects how Candida behaves. Higher oestrogen levels, such as during pregnancy or on HRT, are linked to thrush coming back. The combined pill may play a part for some people too.1
Your cycle matters as well. Some people get thrush around the same point in their cycle each month. A GP can help you work out whether your period is the trigger.2
Pregnant and keep getting thrush? Speak to your GP or midwife. Fluconazole should not be used in pregnancy unless clearly necessary, so you'll usually be offered a pessary or cream instead.1,5
Jotting down when each episode starts can reveal a pattern linked to your cycle, contraception or HRT. That makes the conversation with your GP much quicker.
How do you stop recurring thrush?
If you know your trigger, tackling it comes first. Alongside that, a few everyday habits can help:2
- Wash with water and an emollient rather than soap
- Dry the area properly after washing
- Wear cotton underwear and avoid tight underwear or tights
- Change out of damp swimwear or gym kit promptly
If you're getting thrush four or more times a year, your GP may suggest a longer treatment plan. This usually means one 150mg dose of fluconazole every 72 hours for three doses, followed by one dose a week for six months.1
Do not start this plan yourself. Your GP needs to confirm the diagnosis first, and check your pregnancy risk and any other medicines you take.5
If you could get pregnant, use contraception throughout the course and for 7 days after your last dose. If you're planning a pregnancy, talk to your GP before you start.6
This plan is managed by a clinician. It's separate from Pharmica's fluconazole service, which supplies a single capsule only.
In trials, around 82 to 90 in every 100 women on this plan were free of thrush during treatment.1,7 Some found it came back after stopping, so your GP will review how you're getting on.1
A six-month plan sounds like a lot, but it's one capsule a week once the first three doses are done.
What about probiotics? A 2024 review looked at studies on several gynaecological infections, not just thrush. It found that probiotics, mostly used alongside standard treatment, were linked to lower rates of thrush coming back.8 The studies varied a lot, though.
UK guidelines say there isn't enough consistent evidence to recommend probiotics routinely for treating or preventing thrush.1 They should not replace a proper assessment or antifungal treatment.
You can browse thrush treatments at Pharmica, including fluconazole 150mg capsules. Our fluconazole service is for a single capsule, for people aged 18 to 60 who've had genital thrush diagnosed by a doctor before. It has extra conditions too, including checks on other medicines you take (the only medicine you can take alongside it is the contraceptive pill) and, for men, whether a partner has had thrush. Tell the pharmacist about all your medicines and health circumstances, and do not stop another medicine just to qualify. A pharmacist will check it's suitable for you.
If you need a longer treatment plan for recurring thrush, you may fall outside this service, so speak to your GP. Do not use antifungal treatment more than twice in six months without speaking to a pharmacist or doctor.2 Recurring or persistent symptoms need checking by a professional.
When should you see a GP?
See a GP or visit a sexual health clinic if:2
- You keep getting thrush
- Treatment hasn't worked
- It's your first time having symptoms
- You're pregnant or breastfeeding
- You're under 16 or over 60
- You have a weakened immune system, for example because of diabetes, HIV or chemotherapy
“If thrush keeps coming back or treatment hasn't helped, see your GP to check that it's thrush and look for possible causes. Other conditions can cause similar symptoms. Do not use antifungal medicine more than twice in 6 months without speaking to a pharmacist or doctor.
Ana Carolina GoncalvesSuperintendent Pharmacist
Speak to a doctor before treating thrush yourself if you have any unusual vaginal bleeding, blood-stained discharge, sores or blisters, lower tummy pain, or pain when you pee.9
Bleeding, sores or tummy pain alongside thrush-like symptoms need a doctor's opinion first, not over-the-counter treatment.
If you've been wondering why you keep getting thrush, one of the triggers above may be part of the answer. But even when no trigger turns up, a GP can confirm the diagnosis and put a plan in place to keep it under control.1
Frequently asked questions
Why do I keep getting thrush after sex?
Thrush isn’t a sexually transmitted infection, but sex can trigger it. Friction can irritate delicate skin, giving the yeast that causes thrush a chance to overgrow. If it keeps happening, try avoiding sex until symptoms have fully cleared. Partners don’t usually need treatment unless they have symptoms too. If thrush follows sex every time, see your GP to rule out other causes.
Is recurrent thrush a sign of cancer?
Recurring thrush isn’t usually a sign of anything serious. Most of the time it’s down to an everyday trigger like antibiotics, hormones or irritating products. Sometimes it can point to an underlying issue such as high blood sugar or a weakened immune system, which is why it’s worth seeing a GP. Get checked promptly if you also notice unusual bleeding, sores or blisters.
Does thrush go away on its own?
Mild thrush sometimes clears without treatment, but you can’t rely on it. Antifungal treatment is the most dependable way to get rid of it, and symptoms should usually clear within 7 to 14 days of starting. If thrush hasn’t cleared after treatment, or keeps returning, see a GP. It may need a longer course, or it may not be thrush at all.
Why do I keep getting thrush before my period?
Hormone levels change across your menstrual cycle, and those shifts can make it easier for thrush to take hold. Some people find it appears at the same point every month. Keeping a note of when symptoms start can help you and your GP spot the pattern. If it’s happening every cycle, your GP may suggest a longer-term treatment plan.
Can men get recurring thrush?
Yes. Men can get thrush on the head of the penis and under the foreskin, causing redness, irritation and a white discharge. It’s less common than in women, but it can keep coming back, particularly with diabetes or a weakened immune system. If you keep getting thrush as a man, see your GP so they can check for an underlying cause.
Do probiotics help with recurring thrush?
The evidence isn’t strong enough yet. UK guidelines say there isn’t enough consistent evidence to recommend probiotics routinely for treating or preventing thrush. A 2024 review of studies on several gynaecological infections, not just thrush, found probiotics taken alongside antifungal treatment were linked to fewer repeat episodes, but the studies varied a lot. Probiotics should not replace a proper assessment or antifungal treatment.
References
- Saxon C, Edwards A, Rautemaa-Richardson R, et al. British Association for Sexual Health and HIV national guideline for the management of vulvovaginal candidiasis (2019). International Journal of STD & AIDS. 2020;31(12):1124-1144. doi:10.1177/0956462420943034
- NHS. Thrush in men and women. NHS website; 2023. nhs.uk
- Denning DW, Kneale M, Sobel JD, et al. Global burden of recurrent vulvovaginal candidiasis: a systematic review. The Lancet Infectious Diseases. 2018;18(11):e339-e347. doi:10.1016/S1473-3099(18)30103-8
- AstraZeneca UK Limited. Forxiga 10 mg film-coated tablets: Summary of Product Characteristics. Electronic Medicines Compendium; 2026. medicines.org.uk/emc
- Sun Pharma UK Limited. Fluconazole 150 mg Capsules: Summary of Product Characteristics. Electronic Medicines Compendium; 2026. medicines.org.uk/emc
- NHS. Fluconazole: a medicine to treat fungal infections. NHS website; 2026. nhs.uk
- Sobel JD, Wiesenfeld HC, Martens M, et al. Maintenance fluconazole therapy for recurrent vulvovaginal candidiasis. New England Journal of Medicine. 2004;351(9):876-883. doi:10.1056/NEJMoa033114
- Abavisani M, Sahebi S, Dadgar F, et al. The role of probiotics as adjunct treatment in the prevention and management of gynecological infections: An updated meta-analysis of 35 RCT studies. Taiwanese Journal of Obstetrics and Gynecology. 2024;63(3):357-368. doi:10.1016/j.tjog.2024.03.004
- Bayer plc. Canesten Thrush Oral Capsule 150mg capsule: Summary of Product Characteristics. Electronic Medicines Compendium; 2024. medicines.org.uk/emc
This article is intended for informational purposes only and does not replace professional medical advice. Always read the patient information leaflet supplied with your medication and speak to a healthcare professional if you have specific concerns.