Vitamin B12 is an essential nutrient that can be sourced from your diet. However, people can develop a B12 deficiency for a number of reasons.
There are several common symptoms associated with a deficiency, but some of them can be rather painful. When you are deficient in vitamin B12, you can develop what is known as "deficiency anaemia".
According to the NHS, among the most commonly reported symptoms are some uncomfortable changes to your tongue and mouth. People may develop "a sore and red tongue" known as glossitis, or mouth ulcers.
Ulcers can develop on the gums or tongue, and though they usually clear up on their own, they can be uncomfortable when present. READ MORE: Sue Nicholls health: TV viewer spotted star's 'red flag' cancer signPeople with glossitis might notice their tongue appears "beefy" or "fiery red and sore".
Read more on msn.com