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What are the signs of a vitamin B12 deficiency?


I have Crohn's disease so a vitamin B12 deficiency is common with Crohn's because I have had the part of my colon removed where B12 absorption would take place. My IBD nurse diagnosed it by asking me about my socks. I said my socks are tight and I have just thrown them away. She said, get them out of the bin and lets do your bloods.


Signs of deficiency include:

  • extreme tiredness

  • feeling faint

  • lack of energy

  • headaches

  • pins and needles

  • muscle weakness

  • depression and cognitive problems, such as impaired memory, understanding and judgement.


Anaemia can occur when a lack of B12 or folate affects our body’s ability to produce enough red blood cells.


A lack of B12 can also lead to a raised blood levels of an amino acid called homocysteine which, at high levels, is linked to heart disease.