Vitamin B12 deficiency symptoms: Five unusual signs you may be ignoring

Tongue changes

A subtle change to your tongue could be one of the earliest symptoms of a vitamin B12 deficiency.

You may find that your tongue is particularly swollen, or it changes colour.

The swelling may be quite painful, and it may appear that your taste buds have disappeared.

Vision changes

Blurred vision could be caused by not having enough vitamin B12 in your diet.

It’s linked to nervous system damage in the optic nerve, which leads directly to your eyes.