The NHS symptoms list groups them into general anaemia symptoms (tiredness, breathlessness, headaches, loss of appetite, weight loss) and neurological signs (peripheral neuropathy, balance problems, depression, memory and concentration changes, sometimes mood changes or psychosis in advanced cases)
[DOI] [PubMed] [Google Scholar] 91.Okazaki H, Osuga J, Tamura Y, Yahagi N, Tomita S, et al
A study in the Journal of Clinical Biochemistry says, Vitamin B12 deficiency can cause big problems with nerves and blood. Vitamin B12 is key for making DNA, fatty acids, and energy. Source: Journal of Clinical Biochemistry Common Signs of Deficiency A Vitamin B12 shortage can show in many ways, like: Fatigue and weakness Numbness or tingling in hands and feet Difficulty walking Mood changes, such as depression Spotting these signs early is key for quick action
If youre pregnant, have certain health conditions (like kidney disease or blood disorders), or are already taking supplements, your doctor might suggest a different approach
NHS.uk.
