Other signs in the mouth signalling a potential deficiency may include swelling and bleeding of the gums.
How to avoid B12 deficiency
A vitamin B12 deficiency can be avoided in many people by eating enough bread, cereals and other grains that have been fortified with the nutrient.
Meat, poultry, seafood, dairy products and eggs are also good sources of B12.
Other individuals may develop a deficiency due to a shortfall of intrinsic factor – a protein secreted by cells in the stomach that attaches to B12 to help it get absorbed.