B12 deficiency assessment in Reading
If you are worried about B12 deficiency, or you have symptoms that have not been fully explained, you can book a careful GP-led assessment with me, Dr Asim Naqvi, to help you understand what may be going on.
Worried your symptoms could be linked to B12 deficiency?
I often see people who have been struggling for some time with tiredness, brain fog, pins and needles, dizziness, memory problems, mouth symptoms, pain or feeling generally unlike themselves.
Some have been told their B12 result is “normal” but still feel unwell. Others have already tried B12 tablets or injections but do not feel they have had a clear explanation or follow-up plan.
Some have symptoms that have been labelled as stress, fibromyalgia, ME/CFS, long Covid, functional neurological disorder or medically unexplained, but still feel something has been missed.
My role is to look at the whole picture – your symptoms, medical history, risk factors, blood results and response to any previous treatment – before advising on the most sensible next step.
B12 deficiency is important, but it does not explain every symptom. If B12 looks relevant, I will explain why. If another deficiency, medical condition or referral seems more appropriate, I will say so clearly.
What is B12 deficiency?
Vitamin B12 helps the body make healthy red blood cells and supports normal nervous system function. When B12 is low, it can cause symptoms such as tiredness, weakness, pins and needles, mouth symptoms, memory problems and changes in mood or thinking. These symptoms can also have other causes, which is why proper assessment matters.
B12 deficiency is sometimes thought of mainly as a blood problem that causes anaemia. In real clinical practice, the picture can be wider than that. Some people have neurological, cognitive, mood, mouth, fatigue or balance symptoms, and anaemia may not always be obvious at the start.
Current UK guidance recognises that symptoms, risk factors and blood results should be considered together when assessing possible B12 deficiency.
In practice, this is why I do not treat a number on a screen. I interpret your B12 result in context, alongside the pattern of your symptoms, your risk factors, your wider blood results and any response to previous treatment.
Symptoms I often review
B12 deficiency can look different from person to person. It can also overlap with iron deficiency, thyroid disease, folate problems, vitamin D deficiency, inflammation, medication effects and other medical conditions.
I do not treat a number on a screen. I look at the person in front of me, the pattern of symptoms, the risk factors, the blood results, the possible causes and the response to any previous treatment.
I also look for other contributors, because B12 is not always the whole story.
Fatigue, weakness and low energy
You may feel unusually tired, physically weak, drained after simple tasks or unable to recover as you normally would.Brain fog, memory and concentration problems
Some people describe poor memory, slower thinking, reduced focus or feeling mentally “not themselves”.Pins and needles or nerve-type symptoms
This may include tingling, numbness, burning feet, nerve pain, altered sensation, balance problems or poor coordination.Dizziness, light-headedness or palpitations
These symptoms can be worrying, especially when routine checks have not given you a clear explanation.Mouth, tongue and mood symptoms
This may include a sore or red tongue, mouth ulcers, low mood, anxiety or feeling emotionally unlike yourself.Symptoms despite reassurance or treatment
Some people come to me because they still feel unwell despite “normal” results, B12 tablets, B12 injections or previous reassurance.
My approach to B12 deficiency assessment
Your symptom pattern
Your medical history and risk factors
Your blood results in context
Possible pernicious anaemia or absorption problems
Cofactors and alternative diagnoses
A practical plan
Why B12 can become low
Pernicious anaemia and autoimmune gastritis
Gut absorption problems
Diet and restricted intake
Medication effects
Nitrous oxide exposure
More than one contributor
B12 blood tests and “normal” results
B12 blood tests are useful, but they need careful interpretation.
A result may be clearly low, borderline, difficult to interpret or affected by supplements already being taken. Tablets, injections, sprays and patches can all affect B12 blood results, so I will ask what you have already used and when.
If your result has been called “normal” but you still have symptoms, I will not automatically assume B12 is the answer. I will look at the full clinical picture and advise whether B12, another deficiency or another diagnosis needs to be considered.
If B12 deficiency looks unlikely, I will say so clearly. Honest medicine matters.
B12 treatment and follow-up
Treatment depends on the likely cause, your symptoms, whether absorption is a concern and whether there are neurological features.
Some people may need B12 injections. Others may be suitable for oral B12. For some patients, treatment may be short term. For others, especially where absorption is a long-term issue, ongoing treatment and monitoring may be needed.
Response also varies. Some symptoms may begin to improve relatively quickly, while others can take longer. If symptoms do not improve as expected, that does not always mean “more B12” is the answer. It may mean we need to review the diagnosis, look for cofactors or consider another cause.
B12 injections where appropriate
If injections are suitable, I will explain why they are being recommended, what they are intended to do and how your response should be reviewed.
Oral B12 where suitable
For some people, B12 tablets may be appropriate depending on the suspected cause, risk factors and clinical situation.
Further assessment for pernicious anaemia
If pernicious anaemia or autoimmune gastritis is suspected, I can advise on relevant tests, monitoring and whether onward referral may be needed.
Review if symptoms do not fit
If your symptoms do not fit B12 deficiency, or treatment response is not as expected, I will explain what else should be considered.
B12 does not work in isolation
If someone has persistent tiredness, brain fog, dizziness, nerve symptoms or low exercise tolerance, it is often sensible to look at related areas too. This does not mean testing everything without purpose. It means choosing tests that fit the clinical picture.
Iron and ferritin
Folate and vitamin D
Thyroid and inflammation
Gut and autoimmune background
What happens when you book a consultation
You tell me what has been happening
I start by listening. I want to understand what has changed, how long your symptoms have been present and how they are affecting your work, family life, exercise, mood and confidence.
I review your background carefully
I look at your medical history, medication, diet, gut symptoms, menstrual history, family history, previous diagnoses and any past investigations.
I assess your risk factors
This may include autoimmune disease, gut problems, medication effects, vegan or restricted diet, nitrous oxide exposure, bariatric surgery, heavy periods or a family history of related conditions.
I interpret your results in context
I review relevant results such as B12, folate, ferritin, iron studies, vitamin D, thyroid markers and other tests where available.
I explain my clinical opinion clearly
I will explain what I think may be going on, what the results support, what they do not prove and whether B12, iron or another issue seems most relevant.
We agree a practical plan
Your plan may include further testing, B12 treatment, iron treatment, monitoring, symptom tracking, lifestyle advice, a GP letter or referral where appropriate.
B12 Metabolic Clinic is not an emergency service
Please seek urgent help through NHS 111, 999 or A&E if you have severe chest pain, sudden shortness of breath, fainting, weakness on one side of the body, new confusion, black stools, heavy bleeding, rapidly worsening symptoms or anything that feels severe, sudden or unsafe to wait.
If you have new or rapidly worsening neurological symptoms, severe weakness, problems walking or symptoms that feel unsafe to wait, please seek urgent medical advice.
Book a B12 deficiency assessment with me
If you are worried about B12 deficiency, have been told your results are normal but still feel unwell or have symptoms despite B12 treatment, you do not need to work it out alone.
I will take time to listen, review your symptoms and results carefully and help you understand the most sensible next step.
Frequently asked questions
If you are considering an appointment, you may have questions about blood tests, B12 injections, iron infusions or whether this clinic is right for your symptoms. I have answered some of the most common questions below, but if you are unsure, you are welcome to get in touch before booking.
- How is this different from a standard B12 injection service?
This is a GP-led assessment, not just a B12 injection service. I look at your symptoms, medical history, risk factors, blood results, possible causes of deficiency and response to any previous treatment before advising on the next step.
If B12 injections are appropriate, I will explain why. If B12 does not look like the main issue, I will say so and consider other possible causes such as iron deficiency, folate problems, thyroid disease, inflammation, vitamin D deficiency or another medical condition.
- Can B12 deficiency cause symptoms without anaemia?
Yes. B12 deficiency can cause symptoms even when anaemia is not obvious. This is one reason I look at your symptoms, risk factors and blood results together rather than relying on one result alone.
- What symptoms can B12 deficiency cause?
B12 deficiency can be associated with tiredness, low energy, pins and needles, a sore red tongue, mouth ulcers, muscle weakness, psychological symptoms and problems with memory or judgement. These symptoms can have other causes too, so assessment matters.
- What if my B12 result is in the normal range?
A normal result may be reassuring, but it does not always explain the whole picture. I will consider your symptoms, risk factors, other blood markers, supplement use and previous treatment response before advising what to do next.
- Can I book if I have already started B12 tablets or injections?
Yes. Please let me know what you have taken, the dose, how often you take it and when you last used it. B12 supplements can affect blood test results, so this information is important.
- Do I need B12 injections?
Not everyone with low or suspected low B12 needs injections. The right treatment depends on the likely cause, your symptoms, your risk factors and whether absorption is likely to be a problem.
- Is pernicious anaemia the same as B12 deficiency?
No. Pernicious anaemia is one cause of B12 deficiency. It is linked to reduced absorption of B12 because of autoimmune changes affecting the stomach. If it is suspected, I can help you understand testing, treatment and monitoring.
- Will B12 treatment fix all my symptoms?
Not always. B12 deficiency can be important, but not every symptom is caused by B12. If your symptoms suggest another cause or if your response to treatment does not fit, I will explain what else should be considered.