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A wide range of factors may trigger mouth canker sores. The exact cause may often be unknown and thus may not always be avoided.
Canker sores are small and painful mouth sores. These are not cancerous and usually resolve without treatment.
These sores are the commonest cause of mouth ulcers. It has been estimated that somewhere between 20% and 60% of the population have had canker sores at one time or another.
Common triggers and causes of canker sores include (1-6):
Some diseases of the immunity like Behcet’s disease or Kawasaki’s disease also cause increased risk of canker sores in the mouth.
Some foods like spicy preparations, chocolates citrus, acid foods (vinegar, pickles) and excessive salted nuts or potato chips may lead to tiny mucosal injuries. These cause canker sores.