Your doctor may suspect thrush if you:

• Are receiving treatment with antibiotics, steroids (especially if using an inhaler), or medications that weaken the immune system's ability to fight infection (immunosuppressants).
• Have a history of illness (such as diabetes or HIV) or are frail (debilitated).
• Have false teeth, braces, or a retainer.
• Smoke.

Your doctor may suspect thrush in an infant if:

• A newborn or infant refuses to eat.
• The mother of a newborn has a vaginal yeast infection.
• The nursing mother has sore, red nipples.