The NHS has warned people that a painful symptom in the mouth could indicate a serious and even potentially dangerous vitamin deficiency. Certain vitamins and minerals are needed to help the body to function to the best of its ability. By eating a healthy, balanced diet we should be able to get all the nutrients we need. However, sometimes people can be deficient in certain vitamins. Vitamin B12 is one such nutrient that can cause real problems if someone is deficient. Found primarily in animal