Vaginal thrush:
treatment, recurrence & the antibiotic trap

1. What is vaginal thrush?

Vaginal thrush — in medical terms vulvovaginal candidiasis — is an infection of the vagina and the external genital area with yeasts. Most of the time Candida albicans is behind it, less often other Candida species, which respond less well to the usual treatments.^¹

Candida is not some exotic pathogen but a frequent lodger: yeasts can also be detected in women with no symptoms at all. What makes you ill is not the detection but the imbalance — when the fungus multiplies heavily and the lining reacts with inflammation.

That balance is normally kept by the vaginal flora: lactic acid bacteria (lactobacilli) keep the pH low. Once this environment tips — through medicines, hormones, sugar or weakened defences — Candida is given room. Vaginal thrush is therefore not a hygiene problem and no reason for shame; it affects women of every age, with and without a sex life.

2. Symptoms: how to recognise it

The complaints come from inflammation of the vaginal lining and the vulva. What is typical:^²

• Itching — usually the leading symptom, often worst in the evening and at night.
• Burning and soreness — particularly during sex and when urine meets the irritated skin.
• A whitish, crumbly discharge — often described as “curd-like”, clinging rather than runny, with no strong smell.
• Redness and swelling — of the labia and the vaginal entrance, sometimes with small splits in the skin.

What is not typical is fever, lower abdominal pain or a foul-smelling discharge — that points to another cause.

3. Itching is not always thrush

When people assess intimate symptoms themselves, the cause is often mixed up. The most common mistake: bacterial vaginosis is taken for thrush and treated with an antifungal, which does nothing against it.^²

Burning is often confused too: if it burns above all when you pass urine, that fits better with a urinary tract infection — although urine also stings on inflamed vulval skin. The article Burning when urinating describes how to tell them apart.

4. Causes and triggers

Vaginal thrush almost always comes from a disturbance of the vaginal environment, not from “catching” it in the classic sense. The most important factors:^³

• Antibiotics — the classic trigger: they hit the protective lactobacilli as well. More on this below.
• Hormonal influences — oestrogen raises the sugar content of the lining. Pregnancy, the days before your period and to some extent hormonal contraception with the pill are linked with more frequent episodes.
• Poorly controlled blood sugar — with diabetes the sugar content of the lining and the urine rises, which makes it easier for yeasts to multiply.
• Steroids and immunosuppression — glucocorticoids such as prednisolone or immunosuppressive treatments dampen the local defences.
• Overdone intimate hygiene and a warm, damp climate — intimate sprays and vaginal douches destroy the very protection they are meant to improve; tight synthetic underwear and wet swimwear do the rest.

5. Diagnosis: what happens at the practice

The gynaecological assessment is short, barely uncomfortable and usually gives you clarity quickly:

• History: since when, how often in the past year, which medicines — above all antibiotics, steroids, hormonal contraception — and are there underlying conditions such as diabetes?
• A look at the vulva and vagina: redness, coatings, splits in the skin, the nature of the discharge.
• pH measurement: usually normal (acidic) with thrush, typically raised with bacterial vaginosis.
• Microscopy: yeast cells and fungal threads can be seen directly in a wet mount.
• Fungal culture: useful with recurring symptoms or when standard treatment does not work.

Make a note beforehand of how often the symptoms occurred over the past year and which treatments you used yourself — with how long you used them and what effect they had. The guide Prepare for a doctor's appointment offers a structure for this.

6. Treatment: cream, pessary or tablet

Uncomplicated vaginal thrush usually responds well and quickly to antifungals. Topical use and tablets are regarded as comparably effective, so what mainly decides between them is tolerability and your situation.^⁴ The choice is made by the practice.

The itching usually improves noticeably after one to two days — that is no reason to stop: the pack is used up to the end (see How to take medications).

7. Treating it yourself: when that is enough

Over-the-counter antifungals are a genuinely useful relief — for the right situation. The decisive question is not “am I allowed to?” but “do I know reliably enough what I am treating?”

• Reasonable: if you have had thrush diagnosed by a doctor before, the symptoms are identical and mild, and you are not pregnant.
• It belongs at the practice: with a first episode, in pregnancy, with four or more episodes a year, with diabetes or weakened defences, with fever — and always when nothing improves within a few days. The same applies after the menopause, because other causes are more likely then.

8. The antibiotic trap

The point that most often gets lost in the consultation: a considerable share of episodes has a trigger sitting in the medicine cabinet.

Why the flora tips under antibiotics

Antibiotics do not distinguish between the pathogen and the lactobacilli of the vaginal flora. Broad-spectrum agents in particular, such as amoxicillin, reduce the protective lactic acid bacteria. The pH rises, the environment becomes more permeable — and Candida multiplies. Typically the symptoms start towards the end of the antibiotic course or in the days that follow.^³

What does not follow from this is avoiding antibiotics you need. What makes sense is: take the course exactly as prescribed, do not break it off on your own initiative, and tell your practice in advance if you are prone to thrush — see Taking antibiotics correctly. Some practices prescribe a topical antifungal alongside when they know you are prone to it — an individual decision, not a general recommendation. On flora under antibiotics: Gut health.

Steroids and immunosuppression

Glucocorticoids dampen the inflammatory response — and with it part of the local defences. With longer use of prednisolone, fungal infections occur more often, in the mouth as well as the genital area. The basics are set out in Cortisone: myths and facts.

Blood sugar: the underestimated factor

Persistently high blood sugar raises the sugar content of the lining and the urine and gives yeasts a feeding ground. Recurring thrush can therefore point to an undetected type 2 diabetes. Medicines play their part too: SGLT-2 inhibitors such as empagliflozin excrete sugar in the urine — genital thrush is a well-known side effect of this class.

9. When it keeps coming back

Recurrent vaginal thrush is the term used from four episodes a year onwards. That is not a failure and not a hygiene problem but a form of the condition in its own right, treated differently from a single episode.^¹ At the practice it runs in three steps:

1. Confirm the diagnosis. Microscopy and fungal culture establish whether it really is Candida and whether it is a species that responds less well to standard treatments.
2. Look for triggers. Blood sugar, antibiotics, steroids, SGLT-2 inhibitors, contraception, immune status, intimate care, skin conditions.
3. Agree a maintenance plan. After the acute episode comes continued treatment laid out over months, at decreasing frequency. The agent and the duration are set by the practice.

Being honest about it is part of the picture: even on a good maintenance plan, some women have further episodes once the treatment ends. It usually brings considerable relief, but it is not a guaranteed cure.

10. A special case: pregnancy

Vaginal thrush is more common in pregnancy, because the changed hormone balance favours the multiplication of yeasts. Different rules apply here:^⁵

• No self-treatment. In pregnancy, symptoms in the intimate area should always be assessed by a doctor.
• Topical rather than oral. Topical azoles are the treatment of choice; clotrimazole is the best documented. A single oral dose of fluconazole is not recommended.
• A longer course. Treatment often runs over several days rather than as a short course.
• The last trimester in view. Treatment before the birth can make it less likely that the baby picks up thrush of the mouth or the nappy area.

The guide Medications during pregnancy explains how well individual agents have been studied in pregnancy and while breastfeeding.

11. Partners, myths and everyday life

Does the partner need treating too?

As a rule, no: on current understanding, treating the partner routinely does not reduce how often it comes back.^¹ Treatment is only given if he has symptoms of his own, such as a red, itchy glans.

Hygiene and home remedies: what the evidence shows

The most widespread mistaken belief is that more cleaning helps. Vaginal douches are demonstrably harmful, because they flush the flora out; intimate sprays and perfumed wipes irritate. Plain water is enough on the outside.

For yoghurt-soaked tampons, tea tree oil, garlic or vinegar douches there is no reliable evidence of benefit; tea tree oil and vinegar can damage the irritated lining further. The evidence for lactic acid preparations to prevent episodes is limited too.^⁴ Strict “anti-Candida diets” have no proven benefit either; what does make sense is well-controlled blood sugar if you have diabetes.

What helps day to day

• Breathable underwear — cotton rather than synthetics, and change out of wet swimwear and sports kit promptly.
• Keep all your medicines in one place — including over-the-counter products and the pill. That makes the search for triggers easier, see Create a medication plan.

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