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Oral thrush is a condition caused by an overgrowth of yeast in the mouth. It can lead to white patches on the tongue and inner cheeks, as well as discomfort. This condition can occur in anyone but is more common in certain groups, such as individuals with weakened immune systems or those taking certain medications.

Oral & Dental
  • What causes oral thrush in my mouth?
    MedlinePlusMay 2026

    Oral thrush is caused by a yeast fungus called Candida that normally lives in your body. When your immune system is weakened by illness or antibiotics, the yeast can multiply and cause white patches in your mouth.

  • Can I get thrush if I have a weak immune system?
    MedlinePlusMay 2026

    Yes, if you have a weak immune system, you are more likely to get thrush because your body has a harder time controlling the yeast. Treatment might also be more difficult if your immune system is not strong.

  • Why does thrush spread to other parts of my body?
    MedlinePlusMay 2026

    Thrush can spread to other parts of your body like your esophagus (the tube that carries food to your stomach) if the infection is not treated. This happens when the yeast continues to grow and moves beyond your mouth.

  • Will thrush go away on its own without treatment?
    MedlinePlusMay 2026

    Thrush usually does not go away on its own and needs antifungal medicine to treat it. Without treatment, the infection can spread to other parts of your body.

  • Why do antibiotics sometimes cause yeast infections?
    MedlinePlusMay 2026

    Antibiotics kill bacteria in your body, but they can also kill the good bacteria that normally keep yeast under control. When these helpful bacteria are gone, yeast can multiply and cause an infection.