Quick read
Key points
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Vitamin B12 and folate deficiency anaemia occurs when a lack of these essential vitamins prevents the body from producing enough healthy red blood cells. Causes include poor dietary intake, certain digestive conditions that affect absorption, and, for B12, a condition called pernicious anaemia.
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Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
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You experience persistent fatigue, weakness, or breathlessness
01 · Know
What is Vitamin B12 or folate deficiency anaemia?
Vitamin B12 and folate deficiency anaemia occurs when a lack of these essential vitamins prevents the body from producing enough healthy red blood cells. Causes include poor dietary intake, certain digestive conditions that affect absorption, and, for B12, a condition called pernicious anaemia.
Symptoms can include fatigue, weakness, pale skin, shortness of breath, and, particularly with B12 deficiency, symptoms affecting the nerves such as tingling, numbness, or balance problems.
02 · Understand
Clinical context
Self-care advice
A simple blood test can check for B12 and folate deficiency if you have symptoms of anaemia.
03 · Act
When to see a doctor
- 1You experience persistent fatigue, weakness, or breathlessness
- 2You notice tingling, numbness, or balance problems, which can indicate B12 deficiency affecting the nerves
- 3You have a diet low in animal products or B vitamins and haven't discussed supplementation
- 4You have a digestive condition that might affect nutrient absorption
- 5You're already diagnosed and experience new or worsening symptoms despite treatment
04 · Prevent & manage
Practical steps
Take these self-care steps
These measures can help ease symptoms, support recovery, and reduce the chance of things worsening — but they don't replace medical advice if symptoms are severe or persistent.
- 1Take prescribed supplements consistently.Whether tablets or injections, following the prescribed regimen is essential for correcting the deficiency.
- 2Include B12 and folate-rich foods in your diet.Meat, fish, eggs, dairy, and fortified foods are good sources of B12, while leafy greens and legumes provide folate.
- 3Attend follow-up blood tests.These confirm the deficiency is improving and guide whether ongoing supplementation is needed.
- 4Identify and address the underlying cause.Understanding whether the deficiency is dietary or related to absorption helps guide the right long-term treatment.
- 5Be patient with nerve-related symptoms.Tingling or numbness from B12 deficiency can take time to improve even after treatment starts.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Vitamin B12 or folate deficiency anaemia ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Vitamin B12 and folate deficiency anaemia is very treatable once identified, with most people improving well with appropriate supplementation.
B12 deficiency can cause nerve symptoms like tingling and balance problems, which is why it's treated somewhat differently and more urgently than folate deficiency alone.