Oral Medicine · Specialist Guide
Oral Thrush — Causes, Types & Treatment
Oral thrush is a Candida (most often C. albicans) infection of the mouth that presents in several forms: white wipe-off plaques (pseudomembranous), painful red patches (erythematous / denture-related), and chronic white plaques (hyperplastic). It is usually a marker of an underlying cause — antibiotic use, inhaled steroids, dentures, dry mouth, uncontrolled diabetes, immunosuppression — and treating the cause is as important as the antifungal itself.
Medically reviewed by
Dr. Bipin R. Upadhyay
BDS · MDS Oral Medicine & Radiology · PhD Scholar · Associate Professor & Head, Department of Dentistry
Last clinically reviewed: 2026-06-10
- Most common organism
- Candida albicans
- Classic appearance
- Curdy white plaques that wipe off leaving a raw red base
- Common drivers
- Antibiotics, inhaled steroids, dentures, xerostomia, diabetes, immunosuppression
- First-line treatment
- Topical antifungals (nystatin, clotrimazole, miconazole)
- Hyperplastic form
- Considered an oral potentially malignant disorder — needs biopsy
Symptoms to watch for
Causes & risk factors
- Recent broad-spectrum antibiotics
- Inhaled corticosteroids without mouth rinsing
- Ill-fitting dentures + poor denture hygiene
- Dry mouth (xerostomia)
- Uncontrolled diabetes mellitus
- Immunosuppression (HIV, chemotherapy, biologics)
- Smoking (chronic hyperplastic form)
Recognising the three clinical forms
Pseudomembranous: wipe-off white plaques on red base, classic presentation. Erythematous: bright red areas (palate under denture, dorsum of tongue post-antibiotic) with burning. Hyperplastic: non-wipeable white plaques at commissure — biopsy mandatory because of dysplasia risk.
Treatment
Antifungal therapy plus correction of the underlying cause is the gold standard.
- Topical nystatin suspension or clotrimazole troches 4× daily, 10–14 days
- Miconazole oral gel for angular cheilitis
- Systemic fluconazole 100 mg/day for severe, recurrent or hyperplastic disease
- Denture disinfection nightly in chlorhexidine or sodium hypochlorite
- Rinse mouth with water after every inhaled steroid dose
- Tight glycaemic control in diabetic patients
Why thrush keeps coming back
Recurrence is almost always a 'cause' problem, not an antifungal problem. The five usual culprits are: uncontrolled diabetes, ill-fitting dentures with poor hygiene, ongoing inhaled steroids without post-dose rinsing, drug-induced xerostomia, and undiagnosed immune suppression. Address them and the thrush stays away.
Denture care that actually prevents thrush
Most denture-related thrush comes from biofilm on the fitting surface, not just the palate. Remove dentures overnight, brush them daily with a soft denture brush and mild soap, soak in chlorhexidine 0.2% or 1% sodium hypochlorite (acrylic only) nightly, and have the denture relined when fit is loose.
Hyperplastic candidiasis — the form that needs a biopsy
Non-wipeable white plaques at the angle of the mouth in smokers are not friction keratosis until proven otherwise. Chronic hyperplastic candidiasis is an oral potentially malignant disorder; a biopsy is part of standard care, not an over-reaction.
See a specialist if you have any of these
- Recurrent thrush in an adult with no obvious cause
- Thrush extending into the throat with difficulty swallowing
- Non-wipeable white plaque (suspect hyperplastic candidiasis — biopsy)
- Coexisting unexplained weight loss
Frequently asked questions
Is oral thrush contagious?
Candida is part of the normal oral flora in many people. Casual transmission is rare; the relevant question is what reduced your defences to let it overgrow.
Why does my thrush keep coming back?
Recurrent thrush almost always means an unresolved cause — uncontrolled diabetes, ill-fitting dentures, ongoing inhaled steroids without rinsing, xerostomia or immunosuppression. Repeated antifungals without addressing the cause won't work.
Can I treat thrush with home remedies?
Salt-water rinses and probiotic measures can be supportive but do not replace antifungals. Untreated thrush can extend to the oesophagus, especially in vulnerable adults.
Should I be tested for diabetes or HIV?
An adult with unexplained, recurrent or extensive thrush should have a blood glucose check and, when clinically appropriate, broader immune workup.
Is oral thrush in babies the same condition?
Yes — same organism, usually pseudomembranous form. Treatment is with miconazole oral gel or nystatin suspension and addressing maternal nipple colonisation if breastfeeding.
Will probiotics prevent recurrence?
There is modest evidence for Lactobacillus and Saccharomyces preparations as adjuncts, particularly during antibiotic courses, but they do not replace addressing the underlying cause.
Where can I get oral thrush treated in Mumbai?
Dr. Bipin R. Upadhyay manages oral candidiasis — including recurrent and hyperplastic forms — at K.J. Somaiya Super Speciality Hospital, Sion (Mumbai) and at Reasonable Smile Dental Clinics, Ambarnath.
Specialist care for Oral Candidiasis in Mumbai & Ambarnath
Dr. Upadhyay reviews oral candidiasis at K.J. Somaiya Super Speciality Hospital, Sion (Mumbai) and Reasonable Smile Dental Clinics, Ambarnath. Patients from outside the MMR are seen first by teleconsultation.
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