Vitamin B12 deficiency symptoms include:
- Loss of appetite
- Diarrhea
- Numbness and tingling of hands and feet
- Paleness
- Shortness of breath
- Fatigue (this is due primarily to the anemia)
- Weakness (this is due primarily to the anemia)
- Sore mouth and tongue
- Confusion or change in mental status in severe or advanced cases. This is sometimes confused with dementia.