Oral thrush - adults

Causes of oral thrush 

Thrush infections are caused by an increase in the levels of fungus (yeast) naturally present in the mouth.

Yeasts may grow and cause symptoms if:

  • the immune system is weakened (immuno-deficiency),
  • the healthy bacteria normally found in the mouth are killed,
  • very little saliva is produced, or
  • the acidity of the mouth changes.

Last reviewed: 01/09/2008

Next review due: 01/09/2010

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