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Symptoms of vitamin B12 deficiency may include fatigue, weakness, shortness of breath, loss of appetite, constipation or diarrhea, mouth or tongue soreness, balance problems, confusion, anemia (not having enough red blood cells) and possibly nerve damage that causes numbness or tingling in the hands and feet. Consult your doctor at the first sign of these symptoms.
Most problems due to vitamin B12 deficiency can be treated with vitamin B12 supplementation, but nerve damage may not be reversible even after treatment. The sooner your vitamin B12 deficiency is treated, the more likely it is that your symptoms will go away.
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