Archive · 23 Jul 2026
Vitamin B12 Deficiency: Symptoms and Prevention
Vitamin B12 is super important for our nerves, blood, and brain.
If we don't have enough, we might feel foggy in the head, have tingling in our hands and feet, or have trouble balancing.
Some people are more at risk, like older adults, vegetarians, and those with certain health problems.
Doctors can check for deficiency with blood tests and treat it with supplements or shots.
Eating foods like meat, eggs, and dairy can help prevent it.
It's important to see a doctor if you have these symptoms, as early treatment can prevent long-term damage.
Vitamin B12 is crucial for nerve function, red blood cell production, and brain health.
Symptoms of deficiency include brain fog, tingling in hands and feet, poor balance, and memory problems.
High-risk groups include adults over 60, vegetarians/vegans, and those with digestive disorders or taking certain medications.
Diagnosis involves blood tests, and treatment includes supplements or injections.
Prevention involves a balanced diet rich in B12 or supplements for those at risk.
- Who
- Adults over 60, vegetarians/vegans, people taking certain medications, individuals with digestive disorders, and those with a history of stomach/intestinal surgery.
- What
- Vitamin B12 deficiency can cause neurological symptoms like brain fog, tingling, poor balance, and memory problems.
- When
- Symptoms may develop gradually and can be mistaken for stress, ageing, or other conditions.
- Where
- Globally, affecting individuals with dietary restrictions, absorption issues, or underlying health conditions.
- Why
- Vitamin B12 is crucial for nerve function, red blood cell production, and brain health; deficiency can lead to irreversible nerve damage if untreated.
Dietary Intake
Absorption Issues
Cause of Deficiency
Dietary Intake
Vitamin B12 deficiency is primarily caused by inadequate dietary intake, especially in vegetarians and vegans.
Absorption Issues
Deficiency can also result from poor absorption due to age, medications, digestive disorders, or autoimmune conditions like pernicious anaemia.
- Importance of Vitamin B12
- Essential for nerve function, red blood cell production, DNA synthesis, and normal brain function.
- Common Symptoms
- Brain fog, tingling in hands and feet, poor balance, memory problems, fatigue, mood changes, blurred vision, muscle weakness, glossitis, reduced reflexes.
- High-Risk Groups
- Adults over 60, vegetarians/vegans, people taking metformin or acid-reducing medications, individuals with stomach/intestinal disorders, those who have undergone bariatric surgery, and patients with pernicious anaemia.
- Diagnosis
- Complete blood count (CBC), serum vitamin B12 levels, methylmalonic acid (MMA) testing, homocysteine levels, tests for pernicious anaemia if suspected.
- Treatment
- Oral supplements, B12 injections for severe deficiency or poor absorption, treating underlying absorption issues.
- Prevention
- Balanced diet rich in fish, lean meat, poultry, eggs, milk, and dairy products; fortified foods or supplements for vegetarians/vegans.