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Candidiasis (Oral Thrush)

What is Candidiasis (oral thrush)?

Oral thrush, medically known as candidiasis, is a fungal infection of the mouth caused by an overgrowth of Candida yeast—most commonly Candida albicans. In a healthy mouth, small amounts of Candida live harmlessly among the normal bacteria, but certain conditions allow the fungus to multiply rapidly, forming white patches on the tongue, inner cheeks, gums, palate, or throat. While the condition is generally mild, it can be uncomfortable, affect nutrition, and sometimes signal an underlying health problem.

Common Causes

Oral thrush does not have a single cause; rather, it results from a combination of factors that disrupt the natural balance of microbes in the mouth. The most frequent contributors include:

• Antibiotic use: Broad‑spectrum antibiotics kill beneficial bacteria that keep Candida in check.
• Inhaled corticosteroids: Common in asthma or COPD treatment; residue can coat the mouth.
• Immune system suppression: HIV/AIDS, chemotherapy, organ transplantation, or high‑dose steroids.
• Diabetes mellitus: Elevated blood glucose provides food for yeast and impairs immunity.
• Dry mouth (xerostomia): Reduced saliva limits its natural antifungal action.
• Wearing dentures: Poorly fitting or poorly cleaned dentures create a moist environment.
• Poor oral hygiene: Accumulation of plaque and food debris nurtures Candida.
• Smoking or tobacco use: Irritates oral tissues and alters the microbial flora.
• High‑sugar or acidic diets: Sugar feeds Candida; acidic foods can irritate the mucosa.
• Neonatal or infant status: Immature immune systems make babies especially vulnerable.

Associated Symptoms

Oral thrush often appears with a characteristic set of signs, although the exact presentation can vary.

• White, creamy plaques that can be wiped away, sometimes leaving a red, raw surface.
• Soreness or burning sensation on the tongue, gums, or inner cheeks.
• Difficulty swallowing (dysphagia) or a feeling that food is stuck in the throat.
• Loss of taste or a metallic taste in the mouth.
• Cracking at the corners of the mouth (angular cheilitis).
• Dry mouth or a cotton‑like feeling.
• In infants, diaper‑type rash on the mouth and tongue, or refusal to feed.

When to See a Doctor

Most cases of oral thrush are treatable at home, but medical evaluation is important when any of the following occur:

• The white patches persist for more than two weeks despite good oral hygiene.
• You experience severe pain, difficulty swallowing, or a feeling of something stuck in the throat.
• Thrush recurs frequently (more than three episodes per year).
• You have an underlying condition such as diabetes, HIV, or are undergoing chemotherapy.
• There is spreading of the infection to the esophagus (esophageal candidiasis) causing chest pain or nausea.
• Newborns or infants show signs of thrush accompanied by poor weight gain or persistent irritability.
• Any signs of an allergic reaction to prescribed antifungal medication (rash, swelling, difficulty breathing).

Diagnosis

Healthcare providers use a combination of visual inspection and laboratory tests to confirm oral thrush and rule out other conditions.

1. Clinical examination: The dentist or physician looks for the classic white plaques and may gently scrape them to see if they come off.
2. Microscopic analysis: A sample of the scraped material is placed on a slide and examined under a microscope for yeast cells and pseudohyphae.
3. Culture: In uncertain cases, the sample is cultured on a special medium to identify the Candida species and test antifungal susceptibility.
4. Swab for esophageal involvement: If throat pain or dysphagia is present, an upper endoscopy (EGD) with biopsy may be performed.
5. Blood tests: For patients with recurrent thrush, doctors may order CBC, HIV test, or blood glucose to uncover systemic causes.

Treatment Options

Therapy aims to eradicate the fungal overgrowth, relieve symptoms, and address any predisposing factors.

Medical Treatments

• Topical antifungals: First‑line agents include nystatin suspension (rinsed, then swallowed) or clotrimazole troches that dissolve in the mouth. Typical duration: 7–14 days.
• Systemic antifungals: For extensive infection, immunocompromised patients, or esophageal involvement, oral fluconazole (150 mg loading dose, then 100 mg daily) or itraconazole may be prescribed for 7–14 days.
• Adjunctive therapy: If inhaled steroids are the culprit, patients should rinse the mouth with water and spit out after each use.

Home and Lifestyle Measures

• Rinse mouth with a salt‑water solution (½ teaspoon salt in 8 oz warm water) three times daily.
• Maintain meticulous oral hygiene: brush twice daily with a soft toothbrush, floss, and replace the toothbrush after infection clears.
• Limit sugary and acidic foods and beverages for the duration of treatment.
• Stay well‑hydrated to promote saliva flow.
• If you wear dentures, remove them at night, clean them with a denture‑cleaning solution, and soak them in water.
• For patients using inhaled steroids, use a spacer device and perform a mouth rinse after each dose.

Prevention Tips

Because oral thrush often reflects an imbalance, preventing recurrence focuses on maintaining a healthy oral environment and managing underlying risk factors.

• Practice good oral hygiene: Brush, floss, and replace toothbrushes regularly (every 3 months).
• Control blood glucose: Keep diabetes well‑regulated; aim for HbA1c <7 % (or as directed by your provider).
• Limit antibiotic exposure: Use antibiotics only when prescribed and complete the full course.
• Manage dry mouth: Chew sugar‑free gum, sip water, and consider saliva substitutes if xerostomia is medication‑induced.
• Proper denture care: Clean daily and have regular dental check‑ups to ensure a good fit.
• Avoid tobacco and limit alcohol: Both irritate the mucosa and promote yeast growth.
• Nutrition: Emphasize probiotic‑rich foods (yogurt, kefir, fermented vegetables) that may help maintain microbial balance.
• For inhaled steroids: Use a spacer and rinse mouth after each use.
• Regular dental visits: Early detection of plaque, gum disease, or early thrush can be addressed promptly.

Emergency Warning Signs

References

• Mayo Clinic. “Oral thrush.” https://www.mayoclinic.org.
• Cleveland Clinic. “Candidiasis (Thrush).” https://my.clevelandclinic.org.
• Centers for Disease Control and Prevention. “Candidiasis.” https://www.cdc.gov.
• National Institutes of Health, National Institute of Allergy and Infectious Diseases. “Oral Candidiasis.” https://www.niaid.nih.gov.
• World Health Organization. “Fungal infections.” https://www.who.int.

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