Why does my asthma inhaler give me oral thrush?

Sometimes even when you're managing your asthma well, you can still end up with white patches in your mouth, and that can be alarming if you don't know why. 

Steroid inhalers can leave some medicine on your tongue, cheeks and throat, which can make it easier for Candida, a fungus that lives in your mouth, to grow too much. The result can be oral thrush, which may cause white patches and soreness. A few simple habits can help lower your risk. 

What you will learn in this article: 

• Steroid inhalers can raise your risk of oral thrush. 

• Thrush can cause white patches, soreness and changes in taste. 

• Rinsing and spitting after each dose can help remove medicine left in your mouth. 

• White patches or soreness that do not clear should be checked by a provider. 

If you use an inhaler and notice white patches or soreness in your mouth, schedule an appointment with an Aspen Dental provider. Your care team can check your mouth and help you find ways to manage it. 

Why do steroid inhalers cause oral thrush? 

Inhaled steroids treat swelling in your airways. However, some of the medicine may land in your mouth and throat instead of reaching your lungs. This can lower the mouth’s local defenses and allow Candida to grow too much. 

A narrative review found that inhaled steroids can change the balance of germs in the mouth and create conditions that allow oral thrush to develop.¹ 

How common is this problem? 

Estimates vary. Oral thrush affects an estimated 5% to 15% of people in the U.S. who use inhaled steroids. The risk can rise with higher doses, longer use, poor inhaler technique or not rinsing after a dose.¹ 

What does oral thrush look and feel like? 

Oral thrush can form white or yellowish patches on your tongue, the roof of your mouth or the inside of your cheeks. Some patches may wipe away and leave red, sore tissue underneath. 

You may also notice: 

• Burning or soreness in your mouth

• Dry mouth

• A change in how food tastes

These signs can have other causes, so an exam can help confirm whether thrush is the problem.¹ 

Can you prevent thrush from your inhaler? 

Yes. After each dose of a steroid inhaler: 

• Swish plain water around your mouth. 

• Gargle if you can do so safely. 

• Spit out the water instead of swallowing it. 

• Brush your teeth twice a day with fluoride toothpaste. 

A baking soda rinse is another option mentioned in the research. Ask your doctor or pharmacist whether it is right for you. 

If you use a metered-dose inhaler, a spacer may help more medicine reach your lungs and leave less in your mouth. Not every inhaler works with a spacer, so ask your doctor or pharmacist before using one. These steps can reduce medicine left in your mouth and lower your risk of thrush.¹ 

How is oral thrush treated? 

A dental provider or doctor can examine the white patches and determine whether they are thrush. A literature review on oral candidiasis treatment found that antifungal drugs, whether applied locally or taken systemically, are the standard treatment once other contributing factors are addressed.² 

Do not stop or change your asthma medicine on your own. If thrush keeps returning, talk with the doctor who prescribed your inhaler. They can check your inhaler technique and decide whether your treatment needs to change. 

If you are unsure whether a white coating is thrush or something else, your dental provider can check for oral thrush during an exam. Tell your care team about every medicine you use. Your medicine list can also help them identify other possible gum changes. 

When should you see a dental provider? 

See your dental provider or doctor if white patches do not clear, your mouth stays sore or the symptoms keep returning. Contact your doctor sooner if swallowing becomes painful or you have a weakened immune system. 

Do not wait if a sore area in your mouth is not improving. Contact your local dental provider to check for oral thrush and discuss ways to keep it from coming back. 

Why does my asthma inhaler give me oral thrush? FAQs 

Still have questions about oral thrush and inhalers? These answers cover a few common concerns. 

Can children get oral thrush from asthma inhalers? 

Yes. Children who use steroid inhalers can develop oral thrush. Once a child is old enough to rinse and spit safely, teach them to do so after each dose. Ask your child’s doctor or dental provider about the right routine for their age. 

Does switching inhaler types help? 

The best device depends on the medicine and how it is used. Your doctor or pharmacist can check your technique and explain whether a different inhaler or spacer may help. Do not change your asthma medicine or device without speaking with your doctor. 

Can oral thrush spread to other parts of the body? 

Thrush often affects the mouth and throat. It can become more serious in people with weakened immune systems. Contact your doctor if swallowing hurts or the infection does not improve. 

Are people with weakened immune systems more at risk for oral thrush from inhalers? 

Yes. A weakened immune system makes it harder for the body to keep Candida in check, so infections can take hold more easily and may be harder to clear. If you have a condition or treatment that affects your immune system, mention it to both your doctor and dental provider before starting or continuing a steroid inhaler, so they can watch for early signs and adjust your care plan if needed. 

Sources 

¹ National Institutes of Health, PubMed Central, Healthcare (Basel): “Non-Pharmacological Interventions to Prevent Oropharyngeal Candidiasis in Patients Using Inhaled Corticosteroids: A Narrative Review.” https://pmc.ncbi.nlm.nih.gov/articles/PMC12294484/ 

² National Institutes of Health, PubMed Central, Journal of Clinical and Experimental Dentistry: "Current treatment of oral candidiasis: A literature review." https://pmc.ncbi.nlm.nih.gov/articles/PMC4312689/