Oral Thrush (Candidiasis)

Overview

What is Oral Thrush?

Oral thrush (oral candidiasis) is a fungal infection of the mouth caused by Candida species, most commonly Candida albicans. It presents as creamy white lesions on the tongue, inner cheeks, palate, gums, or throat.

• Caused by overgrowth of Candida yeast
• Common in infants, elderly, and immunocompromised individuals
• Can occur after antibiotic use
• Associated with denture wearing
• Usually treatable with antifungal medications

Overview of the Condition

Candida is normally present in the mouth in small amounts. Oral thrush occurs when the balance of oral microorganisms is disrupted, allowing Candida to overgrow. Various forms exist including pseudomembranous (white patches), erythematous (red patches), and chronic hyperplastic candidiasis.

References

• NCBI - Oral Candidiasis
• Mayo Clinic - Oral Thrush

Symptoms and Causes

Symptoms

• Creamy white lesions on tongue, cheeks, palate
• Lesions can be wiped off revealing red, bleeding tissue
• Cottage cheese-like appearance
• Redness or soreness in mouth
• Cotton-like feeling in mouth
• Loss of taste or unpleasant taste
• Pain while eating or swallowing
• Cracking at corners of mouth (angular cheilitis)
• Denture-related redness under dentures

Causes

• Weakened immune system (HIV/AIDS, cancer treatment)
• Antibiotic use disrupting normal flora
• Inhaled corticosteroids (for asthma)
• Diabetes mellitus (uncontrolled)
• Dry mouth conditions
• Poor denture hygiene
• Smoking
• Infancy or advanced age
• Poor nutrition
• Certain medications

Diagnosis and Treatment Options

Diagnosis

• Clinical examination of lesion appearance
• Scraping lesions to reveal underlying tissue
• Microscopic examination of scrapings (KOH prep)
• Culture if diagnosis uncertain
• Biopsy for chronic hyperplastic type
• Evaluation for underlying conditions

Treatment Options

• Topical antifungals (nystatin, clotrimazole)
• Systemic antifungals for severe cases (fluconazole)
• Treatment of underlying conditions
• Improved denture hygiene
• Rinse mouth after inhaled steroids
• Probiotic supplementation
• Treatment duration typically 7-14 days

Non-Surgical Care

Conservative Management

Antifungal therapy is the mainstay of treatment. Addressing underlying risk factors is essential for preventing recurrence. Good oral and denture hygiene are important adjuncts to medical therapy.

Home Care Recommendations

1. Take antifungal medications as prescribed
2. Practice good oral hygiene
3. Clean dentures thoroughly daily
4. Remove dentures at night
5. Rinse mouth after using inhaled corticosteroids
6. Limit sugar intake
7. Stay hydrated
8. Consider probiotic yogurt

Surgical Care

When is Surgery Needed?

Surgery is not indicated for oral thrush. Medical management with antifungal therapy is the standard treatment. Biopsy may be performed for chronic hyperplastic candidiasis to rule out dysplasia.

Anatomy and Affected Areas

Anatomy Overview

Candida can infect any mucosal surface in the oral cavity. The warm, moist environment of the mouth provides ideal conditions for fungal growth when the normal microbial balance is disrupted.

Affected Areas

• Tongue (dorsal surface common)
• Buccal mucosa (inner cheeks)
• Palate (especially under dentures)
• Oropharynx
• Corners of mouth (angular cheilitis)
• Gingiva less commonly affected

Frequently Asked Questions

Frequently Asked Questions

QuestionAnswerIs oral thrush contagious?It can be passed between individuals but usually requires predisposing factors to cause infection.How long does it take to treat?Most cases resolve within 1-2 weeks with proper treatment.Can thrush come back?Yes, especially if underlying risk factors are not addressed.Is oral thrush serious?Usually mild, but in immunocompromised patients it can spread and become serious.Can I eat with oral thrush?Yes, but soft, non-irritating foods may be more comfortable.Should I be tested for other conditions?If thrush occurs without clear cause, evaluation for diabetes or immune issues may be warranted.

Prevention Tips

Prevention Strategies

• Maintain good oral hygiene
• Rinse mouth after inhaled corticosteroid use
• Clean and remove dentures at night
• Control blood sugar if diabetic
• Limit sugary foods
• Avoid unnecessary antibiotic use
• Stay well hydrated
• Regular dental check-ups

Related Conditions

Related Conditions

• Angular cheilitis
• Denture stomatitis
• Median rhomboid glossitis
• Esophageal candidiasis
• Systemic candidiasis

Additional Treatments

Recurrent or refractory cases may require longer courses of antifungal therapy or different antifungal agents. Investigation for underlying immunodeficiency should be considered. Chronic hyperplastic candidiasis may require biopsy to exclude dysplasia.