Canker Sore Outbreaks, Cold Sores, and Gluten
Canker sores and cold sores are two types of mouth sores that may be affected by eating gluten. Many people consider them trivial but these painful and annoying eruptions may be a clue that something is amiss. A 2020 study found the incidence of celiac disease to be three times as high as the general population if a child had recurrent canker sores/aphthous ulcers.
Canker sores and cold sores are both very common and frequently confused. Their presence is usually seen as a bother that is not worthy of mention. I typically have to inquire about them or they are not discussed. Patients ask, “Everyone gets them, don’t they?”
While they may be commonplace, if they are appearing frequently, further evaluation for underlying reasons is warranted.
Canker sores, known as aphthous ulcers in the medical community, are round or oval lesions, usually surrounded by redness and mild swelling. They occur on the gums, inside of the cheeks and under the tongue. They do not appear on the lips, palate or top of the tongue. You may have anywhere from one to six at a time and they typically last seven to ten days. No one knows their true cause, but there are many known triggers, including gluten for those with a gluten-related disorder. Canker sores are not contagious. They are usually infrequent, occurring once or twice a year. When canker sores occur often, it should be a red flag to you and your practitioner, and prompt further evaluation.
Common triggers for canker sores/ aphthous ulcers include stress, food allergies and sensitivities, hormonal changes, vitamin and mineral deficiencies (iron, folate, B12, zinc ) and sodium lauryl sulfate (found in most toothpaste). They also occur more commonly in people with celiac disease, Crohn’s disease, dermatitis herpetiformis, Behcet’s Disease, and gastric reflux disease. Local trauma to the area, such as accidentally biting your cheek, can also trigger the formation of a canker sore.
Canker Sores and Gluten
Canker sores occur more commonly in people with celiac disease than in the general population. In a 2004 study, five percent of patients with recurrent canker sores were found to have celiac disease. Since this is five times the rate of celiac disease in the general population, a patient with recurrent canker sores should receive prompt screening for celiac disease.
Canker sores are often a sign that someone has been exposed to gluten accidentally while maintaining an otherwise gluten-free diet.I see this frequently in my office; sores appear after a person with celiac disease has dined out. Could canker sores be a clue to cross-contamination in small amounts? I have not found any medical studies about a possible correlation, as it would be difficult to research, but I hear this from my patients frequently.
Some researchers believe that the oral ulcers that occur with celiac disease may be different than the oral ulcers of aphthous stomatitis (canker sores). I would argue that the patient and doctor will be unable to distinguish this difference clinically and that any patient with recurrent oral ulceration should be evaluated for celiac disease.
Do people with non-celiac gluten sensitivity (NCGS) ]get canker sores/aphthous ulcers from gluten? There is very little data on a correlation, but a study published in September 2015 found that the number of canker sores did increase when people with NCGS ate gluten.
Canker Sores: Traditional Therapies
Most canker sores resolve on their own in seven to ten days, but if they are particularly painful or large, treatment may be needed. Mouth rinses, a topical numbing medicine, vitamins (if deficient), anti-inflammatory medication or acetaminophen are used to control symptoms. Topical steroids or steroid rinses are given if symptoms are severe.
In addition to the therapies listed above, avoidance of triggers is crucial to any form of treatment for canker sores. Stress reduction techniques (meditation, exercise, breathing techniques, etc.), avoidance of food triggers (common ones are tomato, pineapple, citrus, and wheat), and adequate sleep and diet (to support a healthy immune system) are all necessary. Lip balm with sunscreen is also needed if sun or wind are triggers. When canker sores do occur in spite of lifestyle modifications, deglycyrrhizinated licorice (DGL) in a pill or mouthwash form is often used. Other alternative therapies include myrrh, goldenseal, chamomile and aloe. These can be used in teas, pills, tinctures or mouthwashes.
Helping to heal
Back to my patient, Ivy. Even though Ivy was already on a gluten-free diet, we discussed the possibility of minute exposures causing symptoms. This can be a problematic issue for some people and an important point to consider even if someone does not have celiac disease. We corrected her low iron and addressed her anxiety over something that was happening at work. We also used topical chamomile tea bags and DGL capsules to alleviate symptoms, and her outbreaks have almost completely stopped.
Cold sores (also called fever blisters) are caused by the herpes simplex virus. They may be preceded by tingling in the area before the tiny fluid-filled sores emerge. The sores blister and eventually break open, forming a crusty lesion. They occur on the lips and lip border and take longer to heal than canker sores – about two to four weeks. They are contagious and can reoccur throughout life once you carry the infection. Reoccurrences tend to be in the same spot, as the virus sits dormant in the nerve. They may be triggered by stress or illness and are not typically frequent occurrences. If common, they should also prompt further evaluation.
Cold sores derive their name from the fact that they occur more commonly when someone has a cold or illness. They appear during times of stress or low immunity, as well as after prolonged sun or wind exposure. They may also appear in correlation with the menstrual cycle. They can be associated with underlying immune disorders, which is why recurrent episodes may require further evaluation.
Cold Sores and Gluten
There is no known direct correlation with gluten. However, if someone is chronically ill or stressed from gluten exposure, cold sores may be indirectly triggered by gluten exposure.
Cold Sores: Traditional Therapies
Most cold sores will resolve with no treatment in two to four weeks. Avoiding close contact with anyone who has a cold sore is the primary means of prevention. Kissing is a common form of transmission. Decrease the risk of passing the virus on to others by avoiding touching blisters. Using sunblock and lip balm may help prevent occurrences for those triggered by sun and wind. Cool compresses and over-the-counter numbing medicines such as benzocaine are used for pain management. Over-the-counter treatments such as Abreva may be applied topically and alcohol-based formulas are used to dry out the lesion. Antiviral prescription medications may be used and shorten the course of symptoms slightly.
As with canker sores, addressing triggers such as lack of sleep or increased stress is vital to the prevention and recovery of cold sores. When symptoms arise, lysine is an amino acid that is commonly used in an oral or topical cream to speed healing. Consumption of foods high in lysine (beans, peas, and corn) can also be used as a means of prevention. A rhubarb and sage cream or lemon balm are also used as topical remedies. Probiotics may also be beneficial to alleviating cold sores by supporting the immune system and combating the virus.
Pay attention to these seemingly harmless actors
If you suffer from either of these disorders, canker sores or cold sores, and they are occurring frequently, pay attention. Consider the possible causes mentioned above and if outbreaks persist, seek further evaluation from your health care provider. These small eruptions may be easily treatable or may signal an underlying disorder in need of further evaluation.
THIS ARTICLE IS COPYRIGHTED BY AMY BURKHART, MD, RD.
Dr. Amy Burkhart is a doctor (M.D.), Registered Dietitian, R.D., and fellowship-trained in integrative medicine. She specializes in treating chronic digestive disorders from an integrative/functional medicine perspective.