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Vitamin B12 Deficiency
Moderate
Vitamin B12 deficiency occurs when the body does not have enough vitamin B12 to support normal red blood cell formation, nerve function, and DNA production. It may develop gradually and can cause tiredness, weakness, pale skin, numbness, tingling, balance problems, or changes in concentration and memory. Severe or prolonged deficiency can cause nerve damage.
Body System
Blood & Immune System
When to Seek Medical Attention
Vitamin B12 deficiency should be medically assessed because prolonged deficiency can cause anemia and potentially persistent neurological problems. Seek prompt evaluation for progressive numbness, weakness, balance problems, difficulty walking, cognitive changes, or significant anemia symptoms. Emergency assessment is appropriate for sudden severe neurological symptoms, chest pain, severe breathing difficulty, fainting, or other acute medical concerns.
Symptoms
3
Causes
3
Treatments
5
Diet
3
Overview
Vitamin B12 deficiency occurs when the body does not have enough vitamin B12 to support normal red blood cell formation, nerve function, and DNA production. It may develop gradually and can cause tiredness, weakness, pale skin, numbness, tingling, balance problems, or changes in concentration and memory. Severe or prolonged deficiency can cause nerve damage.
Symptoms 3
Difficulty Walking
Fatigue
Numbness
Causes 3
Vitamin B12 deficiency can result from inadequate dietary intake, especially in people who consume little or no animal-derived food without appropriate supplementation. It can also occur when the body cannot absorb B12 properly because of pernicious anemia, stomach or intestinal disorders, previous gastrointestinal surgery, or certain medicines. Reduced absorption can be more important than dietary deficiency in some people.
Chronic Disease
Poor Diet
Vitamin B12 Deficiency
Risk Factors
Risk factors include a diet low in vitamin B12, strict vegan diets without supplementation, pernicious anemia, disorders affecting the stomach or small intestine, previous gastrointestinal surgery, and prolonged use of certain medicines that interfere with absorption. Older adults may also have impaired absorption. Alcohol misuse and some chronic gastrointestinal conditions can further increase risk.
Diagnosis
Diagnosis is based on a patient's medical history,
symptoms, physical examination and, when necessary,
laboratory or imaging investigations.
Diagnosis usually involves a medical history, physical examination, and blood testing. A complete blood count may show anemia or enlarged red blood cells, while a serum vitamin B12 measurement can help assess deficiency. Additional tests such as methylmalonic acid, homocysteine, folate, or tests for pernicious anemia may be used when the diagnosis is uncertain or the cause needs clarification.
Prevention
Key Prevention Tips
A balanced diet containing reliable sources of vitamin B12 can help prevent nutritional deficiency
People who follow a strict vegan diet may need fortified foods or a vitamin B12 supplement
Individuals with conditions or medicines that reduce B12 absorption may require periodic monitoring and supplementation under medical guidance
Early evaluation of unexplained anemia or neurological symptoms can prevent prolonged deficiency
Prevention Guidance
A balanced diet containing reliable sources of vitamin B12 can help prevent nutritional deficiency. People who follow a strict vegan diet may need fortified foods or a vitamin B12 supplement. Individuals with conditions or medicines that reduce B12 absorption may require periodic monitoring and supplementation under medical guidance. Early evaluation of unexplained anemia or neurological symptoms can prevent prolonged deficiency.
Reminder: Prevention recommendations should be tailored to your personal health status and risk factors.
Treatment & Management 5
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Detailed treatment guidance is currently being prepared.
Medical Note: The treatment information provided is intended for educational purposes only.
Always consult a qualified healthcare professional before starting,
stopping, or changing any treatment.
Diet & Nutrition 3
Recommended Foods
Fish
Excellent source of vitamin B12.
Milk
Contains vitamin B12.
Eggs
Supports vitamin intake.
Foods to Avoid
Alcohol
May worsen deficiency.
Highly Processed Foods
Poor nutrient content.
Medical Nutrition Note: Diet recommendations are intended for general educational purposes and should be tailored to individual health needs by a qualified healthcare professional.
Frequently Asked Questions 5
It occurs when the body does not have enough vitamin B12.
Fatigue, numbness and memory problems may occur.
Older adults and strict vegetarians are at higher risk.
Blood tests are used to measure vitamin B12 levels.
Yes, supplements are commonly used for treatment.
Helpful Tip: These answers provide general medical information.
Consult your healthcare provider for advice tailored to your condition.