When to worry about numbness and tingling with vitamin B12 deficiency

Vitamin B12 helps maintain healthy blood cells and nerves. Deficiency can cause pins and needles, reduced sensation, burning discomfort, weakness, poor balance, or difficulty knowing where your feet are when walking. It may occur with tiredness, a sore tongue, pale skin, or concentration changes, but nerve symptoms can occur without these features.

Book an appointment if tingling persists, spreads, affects both feet or hands, or is accompanied by balance trouble or weakness. A clinician may review diet, medicines, stomach or bowel conditions, and blood tests. Do not rely on supplements alone or delay assessment, because the cause and suitable replacement plan need to be confirmed.

Seek urgent assessment for rapidly worsening weakness, inability to walk safely, repeated falls, new bladder or bowel problems, or confusion. Call emergency services for sudden one-sided numbness, facial drooping, speech difficulty, sudden vision change, or a severe headache, because these signs can have causes unrelated to B12 deficiency.

Ask which tests can confirm deficiency, whether another condition or medicine may be involved, and how treatment will be given. Ask when improvement should be reviewed and what changes require earlier contact.