Why does vitamin B12 deficiency cause numbness and tingling?

Peripheral nerves carry messages between the brain, spinal cord, skin, and muscles. B12 supports their normal function. When it is deficient, messages may be altered, leading to pins and needles, reduced feeling, burning sensations, clumsiness, or a sense that the feet are not positioned clearly while walking.

Numbness and Tingling is a very common presentation of Vitamin B12 Deficiency. However, altered sensation may also result from pressure on a nerve, diabetes, injury, circulation problems, medication effects, or other neurological conditions.

Arrange a clinical review for new, persistent, spreading, or recurrent numbness and tingling. The assessment may include questions about where the feeling starts, whether both sides are affected, and whether balance or strength has changed. Examination and blood tests can help identify a B12 deficiency and other causes.

Protect areas with reduced feeling from burns, cuts, and pressure. Check your feet and hands for injuries you may not have noticed, and wear supportive footwear if altered sensation affects your balance.

Get urgent medical attention if numbness or tingling begins suddenly with weakness, a drooping face, difficulty speaking, severe headache, loss of coordination, new vision changes, or loss of bladder or bowel control. These symptoms require prompt assessment.

Ask whether the pattern suggests peripheral nerve involvement, what could be causing low B12, whether other tests are needed, and which symptoms should lead you to seek earlier review.