6. Mood swings or depression
Vitamin B12 influences the production of neurotransmitters such as serotonin and dopamine, which regulate mood. Deficiency can lead to mood disturbances including irritability, anxiety, and depression.
These symptoms may precede more obvious neurological signs and are frequently overlooked or attributed to psychological causes alone. Identifying B12 deficiency as an underlying factor is important, especially in patients with treatment-resistant depression.
7. Shortness of breath or dizziness
Shortness of breath and dizziness during minimal exertion can result from anemia caused by B12 deficiency. Reduced red blood cell counts limit oxygen delivery to the organs, causing the heart and lungs to work harder.
Patients may feel lightheaded or experience palpitations. These symptoms indicate moderate to severe anemia and warrant urgent medical evaluation.
8. Glossitis (inflamed tongue)
Glossitis is characterized by a swollen, smooth, and inflamed tongue. Vitamin B12 deficiency causes the tongue to lose its papillae, leading to a sore and shiny appearance. This inflammation can cause discomfort, difficulty swallowing, and altered taste sensations.
This oral manifestation is a helpful clinical clue to B12 deficiency and often accompanies other systemic symptoms.
