So if you get these other symptoms or a number of them as well, it's worth getting your B12 checked out with a doctor.
The symptoms are:
*Rapid breathing or shortness of breath
*Headaches
*Indigestion
*Loss of appetite
*Palpitations
*Vision problems
*Weakness and/or tiredness
*Diarrhoea
*A sore or red tongue and/or mouth ulcers
* Any numbness or prickling in hands or feet or anywhere else in the body. Sometimes burning feet and toes.
*Any cognitive changes, memory problems etc.
*Peripheral neuropathy anywhere in the body.
This can be quite easily treated but anyone with vitamin B12 deficiency will probably be given B12 injections, though possibly just a tablet to take daily.
Even if you eat B12 containing foods regularly a deficiency can sometimes happen, especially as many people who are older no longer produce enough of "intrinsic factor" in the stomach, which is important for B12 absorption.