Thrush: Symptoms, Causes, Treatment and Prevention

Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 19, 2026

Quick Answer: What is thrush?

Thrush, also called oral candidiasis, is a fungal infection that develops when Candida grows out of control, causing raised, white, cottage-cheese-like patches on the tongue, inner cheeks or throat. It can cause mouth pain, redness and taste changes, and severe cases can make swallowing painful. Seek care for worsening symptoms, especially if you have a weakened immune system. [5]

What the research says

• Candida is commonly present in healthy mouths; overt infection usually follows a trigger. A systematic review that included 47 RCTs or systematic reviews reports that Candida is present in the mouths of up to 60% of healthy people, that overt infection is associated with immunosuppression, diabetes, broad-spectrum antibiotics and corticosteroid use, and that in most people untreated candidiasis persists for months or years unless risk factors are treated or eliminated; in neonates spontaneous cure usually occurs after 3 to 8 weeks (Pankhurst, BMJ Clin Evid, 2013). [1]

• In adults with HIV, fluconazole ranked as the most effective antifungal for clinical cure. A network meta-analysis of 15 trials (2,883 participants) ranked fluconazole first for clinical cure (SUCRA 0.87), followed by posaconazole and itraconazole, with nystatin ranked safest; the effect estimates of no other systemic antifungal were significantly higher than fluconazole’s (Rajadurai et al., J Fungi, 2021). [2]

• Oral and oropharyngeal candidiasis remains common where immunity is weakened. In a meta-analysis of 14 studies (4,281 people living with HIV in Africa), pooled prevalence of oropharyngeal and oral candidiasis was 48% (95% CI 34–62%), and 78.7% of 2,095 Candida isolates were C. albicans (Musinguzi et al., Trop Med Health, 2024). [3]

What does thrush look like?

A common sign is a group of creamy white, slightly raised lesions inside the mouth. They often appear on the tongue or inner cheeks, but they may also occur on the roof of the mouth, gums, tonsils or back of the throat. [5]

The patches may look like cottage cheese. If they are lightly brushed or scraped away, the skin underneath may look red and tender and may bleed a little. The mouth can also feel sore or irritated. [5]

Not every white area in the mouth is thrush. A healthcare provider can usually assess the appearance and decide whether testing is needed. [5]

What are the symptoms of thrush?

Thrush can develop suddenly. Symptoms may be mild or more uncomfortable depending on how extensive the infection is and whether a person has a weakened immune system. [5]

Symptom	What it may feel or look like
White patches	Creamy, raised lesions on the tongue, cheeks or other mouth surfaces.
Soreness	Tenderness or pain inside the mouth.
Redness	Irritated tissue beneath or around the lesions, including at the corners of the mouth.
Cottony feeling	A coated or unusual sensation in the mouth.
Taste changes	Reduced or altered sense of taste.
Light bleeding	A small amount of bleeding when patches are scraped or brushed.
Swallowing difficulty	Pain or trouble swallowing if the infection extends into the esophagus.
Food-stuck sensation	A feeling that food is caught in the throat or middle of the chest.
Fever	May occur if the infection spreads beyond the esophagus.

When thrush may affect the esophagus

If infection extends beyond the mouth and throat, swallowing can become painful or difficult. Some people feel as though food is stuck in the throat or mid-chest area. Fever may occur if the infection spreads beyond the esophagus. [5]

Seek prompt medical care for worsening swallowing difficulty, fever or symptoms in someone with a weakened immune system.

What causes thrush?

Small amounts of Candida normally live in the mouth, digestive tract and on the skin. Illness, stress or medication can disturb the usual balance of microorganisms. When that balance changes, Candida may multiply and cause infection. [5]

Medications that can allow yeast to flourish include corticosteroids, antibiotics and birth-control pills. Health conditions that affect the mouth or immune system can also increase risk. [5]

Is thrush contagious?

Thrush is not particularly contagious in most people. It is unusual for someone with a healthy immune system to acquire thrush through kissing or other close contact. However, it can be transmitted in some circumstances, particularly to people who are at higher risk because of a weakened immune system or certain medications. [5]

If you are concerned about exposure, avoid contact with another person’s saliva and wash your hands regularly when you are near someone who has thrush. [5]

Who is more likely to get thrush?

Thrush can affect anyone, but it occurs more often in certain age groups and health situations. [5]

Risk group or factor	Why risk may be higher
Babies under 1 month	Early infancy is associated with increased susceptibility.
Toddlers	Thrush occurs commonly in young children.
Adults 65 and older	Older age is associated with higher risk.
Weakened immune system	Symptoms may be harder to control, and infection may spread more easily.
Diabetes	This condition is associated with increased risk of Candida infection.
Anemia	Anemia is listed among conditions associated with higher risk.
HIV/AIDS	Esophageal thrush is common in this group.
Cancer	Cancer and its effects on the immune system may increase risk.
Dry mouth	Reduced moisture can affect the normal mouth environment.
Pregnancy	Hormonal changes can increase susceptibility.
Smoking	Tobacco use is associated with higher risk.
Ill-fitting dentures	Poor fit may contribute to oral irritation and risk.

Can thrush spread to other parts of the body?

In people with healthy immune systems, thrush rarely causes serious complications. In someone with a weakened immune system, Candida can enter the bloodstream and spread to areas such as the eyes, brain or heart. [5]

This type of infection is serious and can lead to septic shock. People with weakened immune systems should contact a healthcare provider promptly if they develop symptoms of thrush, especially if symptoms are severe, recur or worsen. [5]

How is thrush diagnosed?

A healthcare provider can often recognize thrush by examining the mouth, tongue or cheeks. Lightly brushing a lesion may reveal a red, tender surface that can bleed slightly. [5]

A microscopic examination of tissue from a lesion can help confirm the diagnosis when needed. If infection may have reached the esophagus, evaluation may include a throat culture, endoscopy or X-rays of the esophagus. [5]

Evaluation	What it may assess
Mouth examination	The appearance and location of white lesions and the condition of the tissue underneath.
Lesion sample	Whether the tissue shows features of thrush under a microscope.
Throat culture	Microorganisms collected from the back of the throat.
Endoscopy	The lining of the esophagus, stomach and small intestine using a flexible camera.
Esophageal X-rays	The condition of the esophagus when deeper involvement is suspected.

How is thrush treated?

The usual treatment is a prescribed antifungal medicine. Depending on the situation, antifungals may come as tablets, lozenges or liquids that are swished around the mouth before swallowing. [5]

Treatment is often needed for 10 to 14 days. A healthcare provider selects the medicine and form based on factors such as age and the likely cause of the infection. [5]

Children and adults with healthy immune systems generally respond well to antifungal treatment. Symptoms may be more severe or harder to treat in people with weakened immune systems. [5]

How soon will thrush improve after treatment?

Antifungal treatment can clear thrush in one to two weeks. Even after symptoms improve, you may need to continue the medicine for a few more days to eliminate remaining fungus. Follow the treatment instructions provided by your healthcare professional. [5]

If symptoms do not improve, linger or return after treatment, contact your healthcare provider. Recurring symptoms may indicate a more serious infection or an underlying factor that needs attention.

How can you lower your risk for thrush?

Thrush risk may be lowered with several practical steps that also support good oral health.

Prevention focus	Practical step
Oral hygiene	Brush your teeth at least twice a day and floss at least once a day.
Mouthwashes and sprays	Ask a healthcare provider or dentist which products are appropriate; some can disturb the normal balance of microorganisms.
Dental care	See a dentist regularly, especially if you have diabetes or wear dentures.
Dentures	Ensure dentures fit properly and follow professional cleaning guidance.
Smoking	Avoid smoking and other tobacco use; ask a healthcare provider about quitting support.
Food choices	Limit sugar and yeast-containing foods such as bread, beer and wine if advised as part of your care plan.
Medication review	Discuss possible medication-related risk with a healthcare provider rather than stopping a prescribed medicine on your own.

When should you contact a healthcare provider?

Schedule an appointment if you develop mouth soreness, bleeding or raised white areas inside your mouth. A healthcare provider can determine whether the changes are thrush or another condition.

Call promptly if you have already taken antifungal medicine and the symptoms return. Recurrence can signal a more serious infection or a factor that needs further evaluation.

Seek prompt care for swallowing difficulty, food-stuck sensations, fever, rapidly worsening symptoms or thrush symptoms in someone with a weakened immune system.

Conclusion

Thrush is an overgrowth of Candida that can cause white raised patches, soreness, redness, taste changes and a cottony feeling in the mouth. Most cases are treated with a prescribed antifungal medicine and improve within one to two weeks. [5]

Do not ignore symptoms that persist, worsen or return. A qualified healthcare professional can confirm the cause, choose appropriate treatment and look for factors that may be increasing the risk.

Noticing white patches, mouth soreness or recurring symptoms? Use the guidance in this article to prepare your questions, then contact a qualified healthcare provider or dentist for an evaluation. [5]

Frequently Asked Questions

Is thrush the same as a yeast infection?

Thrush is a yeast or fungal infection caused by an overgrowth of Candida. When it affects the mouth or throat, it is commonly called oral thrush or oral candidiasis.

Can healthy adults get thrush?

Yes. Thrush can affect anyone, although it occurs more often in babies, toddlers, older adults and people with weakened immune systems. Certain medications and health conditions can also increase risk.

Can you scrape thrush off?

The white lesions may be lightly brushed or scraped away, revealing red, tender tissue that may bleed slightly. Do not rely on scraping as a treatment. A healthcare provider should assess the lesions and recommend appropriate care.

How long does thrush last?

With antifungal treatment, thrush often clears in one to two weeks. You may need to continue medicine for a few additional days. Symptoms that linger, worsen or return should be discussed with a healthcare provider.

Can thrush cause trouble swallowing?

Yes. If the infection extends into the esophagus, it can cause painful or difficult swallowing and a sensation that food is stuck in the throat or mid-chest area. These symptoms warrant prompt medical attention.

Is thrush contagious through kissing?

In people with healthy immune systems, it is unusual for thrush to spread through kissing or other close contact. People at higher risk may be more vulnerable. Avoid saliva contact and wash your hands regularly if you are concerned about exposure.

Can antibiotics cause thrush?

Antibiotics are among the medications that can disturb the usual balance of microorganisms and allow yeast to flourish. Do not stop a prescribed antibiotic without speaking with the prescribing clinician.

Can thrush come back after treatment?

Yes. If symptoms return after antifungal treatment, contact a healthcare provider promptly. Recurrence may indicate a more serious infection or an underlying factor that needs evaluation.

References

1. Pankhurst CL. Candidiasis (oropharyngeal). BMJ Clin Evid. 2013;2013:1304. PMID 24209593. https://pubmed.ncbi.nlm.nih.gov/24209593/

2. Rajadurai SG, Maharajan MK, Veettil SK, et al. Comparative efficacy of antifungal agents used in the treatment of oropharyngeal candidiasis among HIV-infected adults: a systematic review and network meta-analysis. J Fungi (Basel). 2021;7(8):637. PMID 34436176. https://doi.org/10.3390/jof7080637

3. Musinguzi B, Obuku EA, Mwesigwa A, et al. Distribution of Candida species isolated from people living with human immunodeficiency virus with oropharyngeal and oral candidiasis in Africa in the era of universal test and treat policy: a systematic review and meta-analysis. Trop Med Health. 2024;52(1):88. PMID 39593167. https://doi.org/10.1186/s41182-024-00649-6

4. National Institute of Dental and Craniofacial Research. Oral Hygiene. NIDCR. Last reviewed December 2024. https://www.nidcr.nih.gov/health-info/oral-hygiene

5. Cleveland Clinic. Thrush. Cleveland Clinic. Last updated January 5, 2023. https://my.clevelandclinic.org/health/diseases/10956-thrush

Disclaimer

This article is for general educational purposes and is not a substitute for professional medical or dental advice, diagnosis or treatment. Always seek the advice of a qualified health or dental provider with any questions you may have regarding a medical or oral-health condition.

It explains what thrush looks like, symptoms, causes, risk factors, diagnosis, antifungal treatment, recovery and prevention. It is not a diagnosis, prescription or emergency protocol. A qualified clinician or dentist should review persistent, severe, recurrent or worsening symptoms, and prompt medical care is needed for swallowing difficulty, fever or signs of infection beyond the mouth.