Common Mouth Sores
June 20, 2023
Learn more bout common mouth sores, what causes them, and what to do when they present themselves.


Ina Alberts

Mouth sores can be painful and uncomfortable. Let’s have a closer look at the most common mouth sores:

Cold Sores / Fever Blisters

These are  caused by the Herpes Simplex virus. They can occur inside the mouth or on lips and are contagious. Triggers can be sunlight, trauma, or stress. They come and go but can’t be cured.

Aphthous Ulcers / Canker Sores

These occur inside the mouth, typically not on the lips, and can vary in size. The larger the lesion, the more painful it usually is.
They are not contagious and go away on their own. The precise causes are unclear; research suspects possible triggers can be a minor injury, stress, food or toothpaste sensitivities, or a diet lacking in specific vitamins, to name a few factors.

Oral Candidiasis / Thrush

These can occur in infants, denture wearers, or people with compromised immune systems, resulting from an overgrowth of the yeast Candida. Treatment is often needed.

Angular Cheilitis

This inflammatory condition affects the corners of the mouth and is non-contagious. Depending on the underlying cause, it may last a few days or persist for extended periods. The best is to address the cause and treat it if it continues.

These mouth sores are usually not something to worry about unless they last longer than 2 weeks.  A healthy diet and lifestyle (including staying hydrated) as well as a strong immune system can help.  Vit B12, Zinc, Folate (folic acid) or iron support a healthy immune system.  Visit your dentist if an oral lesion does not go away after two weeks.   

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