Oral Thrush
(Fungal infection in mouth)

Oral thrush is a fungal infection caused by a yeast fungus called “candida”, which can develop on the lining of the mouth and throat. Most people have small amounts of candida in their mouths that doesn’t develop into a fungal infection. However, radiation therapy can potentially change your saliva production and the environment inside the mouth, which can result in the candida progressing to a fungal infection.

Oral thrush does not usually cause any serious health problems. However, it can cause discomfort and impact on taste and therefore, enjoyment of eating and drinking, and in severe cases it can impact on swallow function.

Your doctors, nurses and speech pathologist will regularly check your mouth for oral thrush. The main symptom that they are looking for is a furry white or yellow coating on the tongue, cheeks, gums, roof of mouth or tonsils.

Thrush is usually treated with a combination of strategies that include:  

• Regular toothbrushing.

• Mouth rinses (see good mouth care section link).

• Using anti-fungal medications prescribed by your doctor.

• Correctly fitting dentures and not wearing them at night.

• Keeping well hydrated (avoid caffeine, sugary and alcoholic drinks).

If you require further assistance with managing oral thrush please speak to an Oncology Nurse or seek a consultation with a Dietitian.

Page reviewed 5th May 2021