Thrush Causes & Risks

Causes

Many microorganisms live in the mouth, including yeast and bacteria. Thrush occurs when the normal balance of these organisms is upset. This allows an overgrowth of Candida (a form of yeast) to occur.

Risk Factors

A risk factor is something that increases your chance of getting a disease or condition. In this case, your risk factors are:

Age:
- Infants and toddlers
- Elderly
Weakened immune system due to:
- HIV/AIDS
- Cancer or medical treatments for cancer, such as chemotherapy
Stress
Prolonged illness
Use of antibiotics
Use of corticosteroids, oral or inhaled
Diabetes
Hormonal changes, such as pregnancy or use of birth control pills
Dentures
Conditions that cause a dry mouth
Smoking

Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition. Copyright © 2026 EBSCO Publishing All rights reserved.