Prednisone and mouth ulcers
Prednisone itself is not a major direct cause of mouth ulcers. In fact, prednisone is often used to treat ulcer conditions because it reduces inflammation. The confusion comes from a few directions: the underlying autoimmune disease that prednisone treats can cause ulcers, the immunosuppression from prednisone can lead to fungal or viral mouth infections that look like ulcers, and abrupt prednisone tapers can flare ulcerative conditions. If you are getting mouth sores on prednisone, the cause needs to be identified before deciding what to do.
Prednisone suppresses inflammation, which is what makes it effective for autoimmune disease, asthma, and inflammatory bowel disease. Many of the conditions prednisone treats can cause mouth ulcers on their own. Crohn's disease, Behcet's disease, lupus, and pemphigus all involve oral ulcers as part of the underlying disease. Prednisone often improves these ulcers; it does not cause them.
Where prednisone can contribute to mouth sores is through immunosuppression. Patients on long-term prednisone are more prone to viral infections like herpes simplex (which causes cold sores on the lips and recurrent ulcers in the mouth) and fungal infections like Candida (which can present as raw, ulcer-looking patches). What looks like a routine ulcer on prednisone is sometimes one of these instead.
A different scenario: when prednisone is tapered too quickly, an underlying autoimmune condition can flare and bring back the ulcers. In this case, the ulcers signal that the dose needs adjustment, not that prednisone is causing them. The pattern (ulcers worsen as dose drops) is the giveaway.
- Track the pattern. Note when the sores started, where they appear, how often they come back, and what the dose was at the time. This helps your prescribing physician and dentist figure out the cause.
- Do not stop or taper prednisone on your own. Abrupt changes can flare your underlying condition and cause adrenal complications.
- Get the sores looked at if they recur or do not heal within two weeks. Persistent ulcers may not be ordinary canker sores; they may be infection or a sign of the underlying disease.
- Use a soft-bristle toothbrush. Mechanical irritation prolongs ulcer healing.
- Avoid alcohol-containing mouthwash and very acidic foods during active sores.
- If you have recurrent cold sores or fever blisters, antiviral prophylaxis is sometimes prescribed for patients on long-term steroids.
- Ulcers that have been present more than two weeks without healing.
- Ulcers that grow over time instead of getting smaller.
- Recurrent cold sores, especially if more frequent than before starting prednisone.
- White or creamy patches that look more like coating than discrete ulcers (possibly thrush).
- Ulcers paired with skin lesions or eye symptoms (suggests the underlying autoimmune condition).
General guidance is a starting point. Your specific dental plan depends on your medical history, your other medications, and what your mouth looks like in person. Schedule a consultation and we’ll walk through it.
Reviewed by Dr. Isaac Sun, DDS.
This page is general information, not medical advice. Do not start, stop, or change any medication based on what you read here. Talk to your prescribing physician and your dentist about your specific situation.