What happened to this man’s taste buds?

His swollen tongue was a sign of deficiency

Remember geographic tongue, with its smooth red ‘islands’ in a sea of papillae?

Tongue

Well, this patient’s condition was more like a continent.

The 64-year-old man’s entire tongue was erythematous, painful and totally bump-free — and had been for six months — when he presented to an oral medicine clinic in Singapore, also reporting a burning sensation around his lips.

But with a few laboratory tests, doctors had his symptoms licked.

The results revealed a serum vitamin B12

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