Thrush
Thrush affects 75% of women. Compare fluconazole vs clotrimazole and understand recurrent thrush management.
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Thrush (Candidiasis)
Causes, symptoms, diagnosis and UK treatment options for vaginal thrush, oral thrush and recurrent candidiasis.
Key fact: Thrush is caused by Candida fungus — most commonly Candida albicans — and affects approximately 75% of women at least once in their lifetime. It is not a sexually transmitted infection and not caused by poor hygiene. It is highly treatable with antifungal medicines, most of which are available over the counter or on prescription online. Recurrent thrush (four or more episodes per year) affects 5–8% of women and requires a specific management approach.
What Is Thrush?
Thrush is a common infection caused by overgrowth of Candida fungi, most frequently Candida albicans. Candida is normally present in small amounts in the vagina, mouth, skin and gut, kept in check by the body’s immune system and the balance of healthy bacteria. When this balance is disrupted, Candida can proliferate and cause symptomatic infection.
Vaginal thrush (vulvovaginal candidiasis) is the most common form in women of reproductive age. Oral thrush (oropharyngeal candidiasis) is common in infants, the elderly, immunocompromised individuals, and those using inhaled corticosteroids. Thrush is not a sexually transmitted infection, though it can be passed between sexual partners in some circumstances.
Types of Thrush
| Type | Site Affected | Who It Affects Most | Key Features |
|---|---|---|---|
| Vaginal thrush (vulvovaginal candidiasis) | Vagina and vulva | Women of reproductive age; most common in 20s–30s | Intense itching; thick white discharge; vulval soreness; not sexually transmitted |
| Oral thrush (oropharyngeal candidiasis) | Mouth, tongue, throat | Infants; elderly; inhaled steroid users; immunocompromised | White patches on tongue/cheeks; sore mouth; difficulty swallowing |
| Penile thrush (candidal balanitis) | Glans penis and foreskin | Uncircumcised men; diabetic men; after sexual contact with infected partner | Redness, itching and soreness of glans; white discharge under foreskin |
| Cutaneous candidiasis | Skin folds (groin, under breasts, axillae) | People with diabetes; obesity; those in moist environments | Red, itchy, moist rash with satellite lesions at skin fold margins |
| Recurrent vulvovaginal candidiasis | Vagina and vulva | 5–8% of women; often associated with genetic susceptibility | 4+ confirmed episodes within 12 months; requires maintenance antifungal therapy |
Causes and Risk Factors
Thrush develops when conditions favour Candida overgrowth. The most important risk factors are:
Antibiotic use
The most common precipitating factor for vaginal thrush. Broad-spectrum antibiotics reduce the protective Lactobacillus population in the vagina, allowing Candida to proliferate. Thrush often begins during or shortly after a course of antibiotics — particularly amoxicillin, doxycycline or metronidazole.
Diabetes mellitus
Elevated blood glucose provides a rich growth substrate for Candida. Both poorly controlled type 1 and type 2 diabetes significantly increase the risk of thrush at all sites. Recurrent or treatment-resistant thrush in a non-diabetic person should prompt blood glucose testing.
Hormonal changes
Oestrogen promotes glycogen deposition in vaginal epithelial cells, which Candida metabolises. Thrush is more common in the second half of the menstrual cycle, during pregnancy (particularly the third trimester), and in women taking high-oestrogen combined contraceptive pills.
Immunosuppression
HIV infection, chemotherapy, high-dose systemic corticosteroids, and other immunosuppressive therapies increase susceptibility to all forms of candidiasis. Recurrent or severe thrush in a previously healthy person should prompt consideration of underlying immune deficiency.
Inhaled corticosteroids
A specific risk for oral thrush. Inhaled steroid residue deposits in the mouth and oropharynx, suppressing local immunity and allowing oral Candida to overgrow. Rinsing the mouth and gargling with water after each inhaler use significantly reduces this risk.
Lifestyle and hygiene factors
Tight-fitting synthetic underwear, prolonged damp conditions (e.g. wet swimwear), and vaginal douching can disrupt the local environment and promote thrush. Spermicides can alter vaginal pH and flora. These factors are less significant than the hormonal and immunological factors listed above.
Symptoms
Vaginal thrush
- Intense itching and irritation of the vulva and vagina — often the most distressing symptom
- Thick, white, creamy or cottage-cheese-like vaginal discharge — typically without significant odour
- Soreness and redness of the vulva; swelling of the labia in severe cases
- Stinging or burning sensation when urinating (due to urine passing over inflamed vulval tissue)
- Pain or discomfort during sexual intercourse
- A rash on the vulva; skin may appear cracked or fissured in severe or recurrent cases
Oral thrush
- White or creamy patches on the tongue, inner cheeks, roof of the mouth or throat
- Patches that bleed if scraped or rubbed
- Soreness and loss of taste
- Difficulty swallowing in severe cases (particularly in immunocompromised individuals)
- Cracking at the corners of the mouth (angular cheilitis)
Thrush vs Bacterial Vaginosis: Key Differences
Thrush and bacterial vaginosis are the two most common causes of abnormal vaginal discharge in women. They require completely different treatments — it is important to distinguish between them before starting treatment.
| Feature | Vaginal Thrush | Bacterial Vaginosis |
|---|---|---|
| Cause | Candida fungal overgrowth | Bacterial imbalance — reduction of Lactobacilli, overgrowth of anaerobes |
| Discharge | Thick, white, cottage-cheese texture; no odour | Thin, watery, grey-white; fishy odour |
| Itching | Intense itching — hallmark symptom | Usually absent or mild |
| Odour | None | Characteristic fishy smell, worse after sex |
| Vaginal pH | Normal (<4.5) | Elevated (>4.5) |
| Treatment | Antifungals: fluconazole or clotrimazole | Antibiotics: metronidazole or clindamycin |
Important: Using antifungal treatment when the actual diagnosis is bacterial vaginosis will not work — and vice versa. If you are unsure which condition you have, or have never been diagnosed with thrush before, a clinical assessment is recommended before starting treatment. Using the Canestest self-test kit can help distinguish between the two.
Diagnosis
In a woman with typical symptoms of vaginal thrush who has been previously diagnosed, self-diagnosis and self-treatment is reasonable. However, NICE recommends clinical assessment in several situations (see “When to Seek Help” below).
Clinical diagnosis is based on history and examination. In recurrent or treatment-resistant cases, high vaginal swab for Candida culture allows species identification and antifungal sensitivity testing — important because non-albicans species (particularly C. glabrata and C. krusei) may be resistant to fluconazole.
Treatment Options
| Treatment | Form | Dosing | Evidence & Notes |
|---|---|---|---|
| Fluconazole 150mg | Oral capsule | Single dose | ~80–90% cure rate at 7 days; first-line oral treatment; contraindicated in pregnancy; also treats penile thrush |
| Clotrimazole pessary 500mg | Intravaginal pessary | Single dose at bedtime | Equivalent efficacy to fluconazole; preferred in pregnancy; no systemic absorption; may damage latex condoms |
| Clotrimazole cream 2% | Topical cream | Applied to vulva 2–3 times daily for up to 7 days | Treats vulval symptoms; usually used alongside pessary for combined vaginal and vulval involvement |
| Clotrimazole pessary 100mg | Intravaginal pessary | One pessary nightly for 6 nights | Longer course; similar overall efficacy; useful for severe symptoms where extended local treatment preferred |
| Fluconazole (recurrent maintenance) | Oral capsule | 150mg weekly for 6 months (after induction) | NICE-recommended for recurrent thrush; prevents recurrence in ~90% during treatment period; specialist prescribing recommended |
| Nystatin oral suspension/lozenges | Oral liquid or lozenge | 4 times daily for 7–14 days | For oral thrush; poorly absorbed systemically; acts locally; first-line for oral candidiasis |
Pregnancy: Oral fluconazole is not recommended during pregnancy due to a potential association with foetal cardiac defects at higher doses. Intravaginal clotrimazole (pessary or cream) is the preferred treatment for vaginal thrush in pregnancy. Always inform your prescriber if you are pregnant or trying to conceive.
Recurrent Thrush
Recurrent vulvovaginal candidiasis (RVVC) is defined as four or more symptomatic, confirmed episodes within 12 months. It is more distressing than isolated episodes, often causes significant anxiety and relationship difficulties, and requires a structured management approach rather than repeated courses of single-dose treatment.
NICE recommended management of RVVC
- Confirm the diagnosis with high vaginal swab — culture identifies species and sensitivity. Non-albicans Candida (especially C. glabrata) requires different treatment.
- Induction phase: Fluconazole 150mg every 72 hours for three doses
- Maintenance phase: Fluconazole 150mg once weekly for 6 months — prevents recurrence in ~90% of women during treatment
- Review and screen: Exclude diabetes (HbA1c), iron deficiency anaemia, and consider HIV testing in appropriate clinical contexts
- Address modifiable risk factors: Discontinue unnecessary antibiotics; switch contraceptive pill if high-oestrogen; optimise glycaemic control in diabetes
Non-albicans thrush: Around 10% of recurrent thrush cases are caused by non-albicans Candida species that do not respond to fluconazole. Candida glabrata in particular requires specialist treatment with boric acid pessaries or alternative antifungals. Culture is essential in any woman not responding to standard fluconazole treatment.
Prevention
- Wear loose-fitting, breathable cotton underwear; avoid tight synthetic clothing
- Avoid vaginal douching, scented soaps, bubble baths and intimate washes — these disrupt the natural vaginal environment
- Change out of wet swimwear or sports clothing promptly
- If using inhaled corticosteroids, rinse mouth and gargle with water after every use
- During antibiotic courses, consider probiotic supplementation (though evidence is modest)
- Optimise blood glucose control if diabetic
- Wipe front to back to avoid faecal Candida contamination of the vulval area
Get Thrush Treatment Online
Access Doctor provides prescription thrush treatment — including fluconazole capsules and topical antifungals — following a confidential online consultation with our GPhC-registered pharmacist independent prescribers. No GP appointment required. Discreet next-day delivery.
View Thrush Treatments →When to Seek Help
Seek clinical assessment if:
- You have never been diagnosed with thrush before — symptoms may have another cause
- You are pregnant — oral fluconazole is contraindicated; intravaginal treatment is preferred
- Symptoms do not improve after completing a standard course of treatment
- You have had four or more episodes in the past 12 months — recurrent thrush requires structured management
- You have symptoms suggesting a sexually transmitted infection alongside thrush symptoms
- You have abdominal pain, fever or unusual discharge — these are not typical thrush symptoms
- Your partner has symptoms — both may need treatment
Seek urgent medical attention if you develop a high fever, rigors, severe abdominal pain or signs of systemic illness alongside genital symptoms. These are not features of uncomplicated thrush and may indicate a serious pelvic infection requiring emergency assessment.
Related Guides
Frequently Asked Questions
What is thrush?
Thrush is a common fungal infection caused by Candida — most commonly Candida albicans. It can affect the vagina, mouth, penis and skin folds. Vaginal thrush affects approximately 75% of women at least once in their lifetime. It is not a sexually transmitted infection and not caused by poor hygiene.
What are the symptoms of vaginal thrush?
The main symptoms are intense itching and irritation around the vagina and vulva, a thick white cottage-cheese-like discharge without significant odour, soreness and redness of the vulva, pain during sex, and stinging when urinating. Thrush does not typically cause a fishy odour — that is more characteristic of bacterial vaginosis.
What is the difference between thrush and bacterial vaginosis?
Thrush causes intense itching, thick white odourless discharge and vulval soreness — driven by fungal overgrowth. Bacterial vaginosis causes thin grey-white watery discharge with a fishy odour but usually without itching. They require completely different treatments: antifungals for thrush, antibiotics for BV.
What treatments are available for thrush?
Vaginal thrush is commonly treated with a single-dose fluconazole 150mg capsule (oral) or intravaginal clotrimazole pessaries and/or cream. Both are around 80–90% effective. Oral fluconazole is not recommended in pregnancy — intravaginal clotrimazole is preferred.
What is recurrent thrush and how is it treated?
Recurrent thrush is four or more confirmed episodes within 12 months. NICE recommends induction with fluconazole 150mg every 72 hours for three doses, then weekly maintenance for six months, which prevents recurrence in around 90% of women during treatment. A high vaginal swab to confirm species is recommended before starting maintenance therapy.
Can I get thrush treatment online in the UK?
Yes. Access Doctor provides prescription thrush treatment — including fluconazole and topical antifungals — following a confidential online consultation with our GPhC-registered pharmacist independent prescribers. No GP appointment required. Discreet next-day delivery.
References
- National Institute for Health and Care Excellence (NICE). Candida — female genital: Clinical Knowledge Summary. Updated 2023. cks.nice.org.uk/topics/candida-female-genital
- NHS. Thrush in men and women. NHS.uk, 2023. nhs.uk/conditions/thrush-in-men-and-women
- Sobel JD. Recurrent vulvovaginal candidiasis. American Journal of Obstetrics and Gynecology. 2016;214(1):15–21.
- British Association for Sexual Health and HIV (BASHH). UK National Guideline for the Management of Vulvovaginal Candidiasis. 2019. bashh.org/guidelines
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. In a medical emergency, call 999.
