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Health condition · Clinically reviewed

Oral thrush, a common fungal infection that clears fast with the right antifungal.

White plaques, sore red patches or cracked mouth corners - oral candidiasis is usually straightforward to diagnose and treat, provided the right cause is addressed too.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE CKS, the BNF and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects current UK guidance on topical and oral antifungal treatment for oral candidiasis.

Key facts

Oral thrush at a glance.

The essentials, in plain English - what it is, who gets it, and how it’s treated in the UK today.

  • What it is

    Overgrowth of Candida albicans on the oral mucosa - a common, usually harmless yeast that most people carry without symptoms.

  • Main types

    Pseudomembranous (white plaques), erythematous (sore red patches), angular cheilitis and denture-related stomatitis.

  • Who it affects

    Infants, denture wearers, people using inhaled corticosteroids, those on broad-spectrum antibiotics, and anyone immunocompromised.

  • Diagnosis

    Usually clinical, from the characteristic appearance - a swab is only needed if the diagnosis is uncertain or treatment fails.

  • First-line treatment

    Topical antifungal - nystatin suspension or miconazole gel - used consistently for the full course.

  • When it recurs

    Unexplained recurrent or severe thrush should prompt a check for an underlying cause, including diabetes or, where relevant, HIV.

Why this guide matters

Treating the infection - and the reason it turned up.

Oral thrush is common and treatable, but clearing it for good usually means dealing with what let it take hold in the first place.

  • A topical antifungal is usually enough

    Nystatin suspension or miconazole gel, used correctly for the full course, clears most uncomplicated infections.

  • The trigger matters as much as the treatment

    Dentures, inhalers and antibiotics are common culprits - fixing the habit around them stops thrush coming straight back.

  • Recurrence deserves a proper look

    Repeated or resistant thrush is worth investigating for diabetes or immunosuppression rather than treating again and again.

How the diagnosis is made

From white plaques to a clear plan.

The steps a UK GP, dentist or pharmacist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    Visual examination

    The mouth, tongue and inner cheeks are checked for white plaques or sore red patches - the pattern usually points straight to the diagnosis.

  2. 02

    Assessing

    The wipe test

    Pseudomembranous plaques can be gently wiped away with a swab or tongue depressor, leaving a red, sometimes slightly bleeding, surface underneath.

  3. 03

    Assessing

    Risk factor review

    Questions cover recent antibiotics, inhaled corticosteroid use, dentures, dry mouth, diabetes and anything affecting the immune system.

  4. 04

    Confirming

    Oral swab if uncertain

    Not routine - reserved for atypical presentations, diagnostic doubt, or infection that hasn’t responded to a proper course of treatment.

  5. 05

    Confirming

    Denture and inhaler check

    Dentures are assessed for fit and cleanliness, and inhaler technique - plus spacer use - is reviewed where thrush follows steroid inhalers.

  6. 06

    Preparing

    Underlying cause assessment

    Recurrent or unusually severe thrush prompts a look for undiagnosed diabetes or immunosuppression, including HIV testing when no other explanation fits.

  7. 07

    Preparing

    Treatment plan agreed

    A topical or oral antifungal is chosen based on how extensive the infection is, any risk factors, and how previous treatment has gone.

Typical timeline: a first visit to a settled plan within days.

Symptoms

What oral thrush actually looks like.

The classic white plaques, the less obvious sore red patches - and the features that mean it’s time to look further.

  • White plaques

    Creamy white patches on the tongue or inner cheeks that wipe off, leaving a red, sometimes sore, base underneath.

  • Sore red patches

    The erythematous type - smooth, tender, red areas without visible plaques, often mistaken for something else.

  • Angular cheilitis

    Cracked, sore, sometimes crusted skin at the corners of the mouth - frequently Candida, sometimes with a bacterial element too.

  • Denture-related stomatitis

    Persistent redness and soreness of the palate under an upper denture, closely linked to denture hygiene and overnight wear.

  • Altered or reduced taste

    A metallic, bitter or muted taste that often accompanies more established infection.

  • Discomfort eating or swallowing

    Soreness that makes hot, spicy or acidic foods uncomfortable, and in some cases makes swallowing painful.

  • Infant thrush

    White plaques inside a baby’s mouth, sometimes alongside nappy-area Candida, and occasionally passed to a breastfeeding parent.

  • Red flag - persistent or recurrent

    Thrush that won’t clear, keeps coming back, or spreads towards the throat deserves a closer look at the underlying cause.

Treatment

How oral thrush is treated in the UK.

Topical antifungals first, oral fluconazole for tougher cases - and always alongside fixing whatever let Candida take hold.

  • Nystatin suspension

    First-line topical antifungal - swished around the mouth after food and held in contact with the affected areas before swallowing.

  • Miconazole oral gel

    An effective topical alternative, applied directly to the plaques - avoided in people taking warfarin or certain statins because of drug interactions.

  • Fluconazole (oral)

    Reserved for extensive, treatment-resistant, or immunocompromised cases - a short systemic course clears infection that topicals haven’t touched.

  • Denture hygiene measures

    Dentures removed overnight, brushed and soaked in an appropriate cleaning solution to stop Candida recolonising the palate.

  • Inhaler technique review

    Rinsing the mouth with water after inhaled corticosteroids, and using a spacer device, meaningfully cuts the risk of thrush recurring.

  • Treating angular cheilitis

    A combined antifungal and mild antibacterial cream applied to the corners of the mouth, since the cracks are often mixed infections.

  • Addressing the underlying cause

    Optimising diabetes control, reviewing medicines that cause dry mouth, or managing immunosuppression where that is driving repeated infection.

  • General oral hygiene

    Regular brushing, tongue cleaning and, where advised, a chlorhexidine mouthwash to support recovery alongside antifungal treatment.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, dentist or pharmacist knows your history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE Clinical Knowledge Summaries (CKS). Candida - oral.

  • British National Formulary (BNF). Antifungal drugs for oral candidiasis.

  • British Society for Oral Medicine. Patient information on oral candidiasis.

  • UK Health Security Agency (UKHSA). Guidance on Candida infections and risk factors.

Red flags

When oral thrush needs a closer look.

Most thrush is straightforward. These are the situations that aren’t - and where further assessment is needed.

  • Persistent despite treatment

    Thrush that hasn’t cleared after a full, correctly used course of topical antifungal treatment needs clinical review.

  • Recurrent without an obvious cause

    Repeated episodes with no clear trigger warrant a check for undiagnosed diabetes or another underlying condition.

  • Unexplained weight loss alongside it

    Thrush appearing together with weight loss can point towards an underlying immune problem that needs investigating.

  • Painful or difficult swallowing

    Odynophagia or dysphagia alongside oral plaques suggests the infection may have spread to the oesophagus and needs specialist assessment.

  • Known HIV or immunosuppression

    New or worsening thrush in someone already immunocompromised can be a sign of declining immune control and should be reviewed promptly.

  • Angular cheilitis that won’t heal

    Cracks at the mouth corners that persist despite treatment can reflect iron or vitamin B12 deficiency alongside the Candida infection.

  • Plaques that won’t wipe off

    A white patch that can’t be rubbed away may not be thrush at all - leukoplakia and other conditions need a biopsy to rule out, not antifungals.

  • Spread beyond the mouth

    Extension towards the throat or oesophagus, or Candida in skin folds, is more likely in people who are immunocompromised.

  • Poorly feeding, distressed infant

    A baby with oral thrush who is feeding poorly or unusually unsettled should be seen by a GP or health visitor promptly.

Living with it

A treatable infection, with a few simple habits.

Four things that make the biggest difference day to day - denture care, a rinse after inhaler use, finishing the course, and knowing when to ask more questions.

A quiet reminder

Small habits, kept up, beat treating the same infection repeatedly.

A minute of denture care or a mouth rinse costs almost nothing - and does more than another course of antifungal.

  1. 01 Hygiene

    Keep dentures clean and dry overnight

    Remove dentures at night, brush them properly and soak in a suitable cleaner - this alone prevents a lot of recurrence.

  2. 02 Inhaler

    Rinse after every inhaled steroid dose

    A quick water rinse, plus a spacer device, cuts the amount of steroid left sitting on the oral mucosa.

  3. 03 Course

    Finish the full antifungal course

    Stopping as soon as symptoms ease - rather than completing the course - lets Candida come straight back.

  4. 04 Escalate

    Ask about recurrence

    Two or more episodes without an obvious trigger is worth a proper conversation about what might be driving it.

Frequently asked

Everything we get asked about oral thrush.

Quick answers on appearance, treatment, recurrence and prevention.

  • What is oral thrush?

    Oral thrush, or oral candidiasis, is an overgrowth of the yeast Candida albicans in the mouth. It causes white plaques or sore red patches on the tongue and inner cheeks, and is common in infants, denture wearers, people using inhaled corticosteroids, and anyone with a weakened immune system.

  • What does oral thrush look like?

    The classic form shows creamy white plaques that wipe off to reveal a red, sometimes tender, base underneath. It can also appear as smooth, sore red patches with no visible plaques, as cracking at the corners of the mouth, or as persistent redness under an upper denture.

  • How is oral thrush treated?

    Most cases respond to a topical antifungal such as nystatin suspension or miconazole gel, used consistently for the full course. More extensive, resistant, or immunocompromised cases may need a short course of oral fluconazole instead.

  • Why do I keep getting oral thrush?

    Recurrent thrush usually points to an ongoing risk factor - poor denture hygiene, inhaled steroids used without rinsing afterwards, recent antibiotics, or an underlying condition such as diabetes. Repeated unexplained episodes are worth discussing with a GP or dentist.

  • Can oral thrush be serious?

    Uncomplicated thrush usually clears quickly with treatment. It becomes more of a concern if it spreads towards the throat, causes pain on swallowing, or keeps recurring without explanation, since these can signal a more significant underlying problem needing further assessment.

  • How can I prevent oral thrush if I use an inhaler or wear dentures?

    Rinse your mouth with water after every dose of an inhaled corticosteroid and use a spacer device where possible. If you wear dentures, take them out overnight, clean them properly, and have their fit checked periodically.

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