If you have vitamin B12 deficiency, you could become anemic. A mild deficiency may cause no symptoms. But if untreated, it may lead to symptoms such as: Weakness, tiredness, or lightheadedness.

What happens when your B12 is extremely low?

If you have vitamin B12 deficiency, you could become anemic. A mild deficiency may cause no symptoms. But if untreated, it may lead to symptoms such as: Weakness, tiredness, or lightheadedness.

Can B12 deficiency cause serious problems?

A lack of vitamin B12 can cause neurological problems, which affect your nervous system, such as: vision problems. memory loss. pins and needles (paraesthesia)