Other signs and symptoms of B12 deficiency

Muscle cramps and muscle weakness. B12 deficiency negatively impacts motor and sensory nerve function, which can cause muscle cramps and weakness. Impaired coordination. Ataxia, or impaired balance and coordination, is a neurological symptom that can be caused by B12 deficiency. As such, a person with B12 deficiency may have difficulty walking and balancing.
Erectile dysfunction. Men with B12 deficiency may experience erectile dysfunction as a result of increased levels of homocysteine in the body.
Vision disturbances. B12 deficiency may cause vision disturbances, possibly due to damage to the optic nerve.