Tingling in the hands, feet, legs, or arms is one of the most important warning signs of vitamin B12 deficiency. People often describe it as pins and needles, burning, crawling sensations, or numbness.
This happens because B12 is important for nerve health. If deficiency continues untreated, nerve symptoms may become more serious. The NHS lists pins and needles and problems with movement as neurological symptoms linked with vitamin B12 deficiency.
If tingling or numbness keeps returning, especially in both feet or hands, it should be checked.
4. Balance Problems or Trouble Walking
Vitamin B12 deficiency may affect coordination and balance. A person may feel unsteady, stumble more often, or walk differently. They may have trouble climbing stairs or feel less confident moving around.
The NIH Office of Dietary Supplements lists problems with balance among symptoms of vitamin B12 deficiency. It also notes possible depression, confusion, dementia, poor memory, and soreness of the mouth or tongue.
Balance problems can also be caused by inner ear issues, stroke, medications, vision problems, low blood pressure, or neurological disease. But because B12 deficiency is treatable, it is worth testing when symptoms appear.
5. Memory Problems or Brain Fog
