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Dhankecha Mayank Dineshbhai MBBS Last updated on 13th Jan, 2026 Introduction Pernicious anaemia is a type of vitamin B12 deficiency anaemia that occurs when the body cannot absorb enough vitamin B12 from food due to a lack of intrinsic factor, a protein made in the stomach

When to see a doctor or dentist See a doctor or dentist about your mouth ulcers if you develop any of the following: unusually large mouth ulcers new mouth ulcers that appear before the old ones heal sores that persist for more than 3 weeks painless sores sores that extend to the lips pain that youre unable to manage with over-the-counter or natural medications severe problems eating and drinking high fever or diarrhea whenever your mouth ulcers appear Your doctor will be able to diagnose mouth ulcers through a visual exam