Vitamin B12 deficiency symptoms

http://www.health.harvard.edu/blog/vitamin-b12-deficiency-can-be-sneaky-harmful-201301105780

Vitamin B₁₂ deficiency can be slow to develop, causing symptoms to appear gradually and intensify over time. It can also come on relatively quickly. Given the array of symptoms it can cause, the condition can be overlooked or confused with something else. Symptoms may include:

Strange sensations, numbness, or tingling in the hands, legs, or feet

Difficulty walking (staggering, balance problems)

Anemia

A swollen, inflamed tongue

yellowed skin (jaundice)

difficulty thinking and reasoning (cognitive difficulties), or memory loss

paranoia or hallucinations

weakness

fatigue