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Causes of Oral Thrush

Posted on 4/26/2021 by Office
Causes of Oral ThrushOral thrush, also known as oral candidiasis, is a yeast infection that causes creamy white patches in the mouth. The major sites of this yeast infection in the mouth are the tongue, insides of the cheeks, and the back of the throat.

Oral thrush can cause slight pain and discomfort while eating and drinking. It also gives our mouth an unpleasant taste and odor. It is caused by candida fungi that are naturally present in our digestive system, mouth, and throat. The candida fungi also live on our skin and nails. But the overgrowth of this fungus can lead to the candida yeast infection in the mouth, which is generally known as oral thrush.


Prolonged usage of antibiotics and certain drugs can cause an imbalance in the amount of microorganisms (bacteria and fungi) that are naturally present in our bodies. Antibiotics like tetracyclines, quinolones, and penicillin can lead to an overgrowth of candida fungi in our bodies. This can result in the occurrence of oral thrush. Drugs like prednisone and corticosteroid inhalers can also lead to increased growth of candida fungi and put you at the risk of oral thrush.


Patients who are diabetic are more at risk of oral thrush. Diabetic patients have a high amount of glucose in their saliva. This encourages the growth of candida fungus because yeast feeds on sugar. This leads to the occurrence of candida yeast infection on the tongue, inner cheeks, gums, and at the back of the mouth. The appearance of these creamy white patches in the mouth is known as oral thrush.

Weak Immune System

Oral thrush is more likely to occur in patients who have a weak immune system, such as cancer patients, HIV/ AIDS patients, or patients with other immune disorders. Infants and older people are also more at the risk of oral thrush because their immune system is quite weak and sensitive. The immune system is unable to fight and control the overgrowth of candida fungi in the body, and this leads to the occurrence of oral thrush.

Some medications that make the immune system inactive, such as those that are given to organ transplant patients, can also cause oral thrush because the body is unable to produce antibodies to fight the fungi.


Smokers are more at risk of oral thrush. The tobacco and chemicals in cigarette smoke cause an increase in the microbial growth of bacteria and fungi that are naturally present in our body. Candida fungi are present in a larger quantity in the saliva and mouth of smokers. Other conditions such as dry mouth, reduced immunity, and lack of oral hygiene can lead to an overgrowth of candida fungus in the smokers' mouths and lead to oral thrush.

If you are suffering from oral thrush, then visit us at Joshua Austin, DDS MAGD FACD. Joshua Austin, DDS MAGD FACD and can prescribe the best treatment for your oral thrush. You can also call us at (210) 408-7999 to schedule your appointment.
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Joshua Austin, DDS, 4553 N Loop 1604 W, Suite 1211, San Antonio, TX 78249 - (210) 408-7999 - - 2/1/2023 - Associated Words: dental implants San Antonio -