A deficiency in B12 can cause mood swings, irritability, or depression. B12 is important for the production of serotonin, a neurotransmitter that regulates mood.
7. Shortness of breath or dizziness
People with B12 deficiency may feel short of breath or dizzy even during simple activities. This happens because a lack of B12 can impair red blood cell production, leading to anemia and improved oxygen levels.
8. Glossitis (swollen, inflamed tongue)
A B12 deficiency can cause the tongue to become sore, swollen, smooth, and inflamed. This is called glossitis and often leads to difficulty swallowing or speaking.
9. Vision problems