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What are canker sores? Canker sores (also called aphthous ulcers) are different than fever blisters. They are small, red or white, shallow ulcers occurring on the tongue, soft palate, or inside the lips and cheeks; they do not occur in the roof of the mouth or the gums. They are quite painful, and usually last 5-10 days.
There are many infections that can cause sore pain on your palate and it will fade if the proper treatment of infection is done. The infection can be viral or bacterial. Sores can be even due to fever, blisters, cold sores, it may even cause pain in your mouth roof. It may hurt during eating some hot and spicy food or some acidic ingredient may initiate palate lining sores. Some other causes may be alcohol or even tobacco.