Why are my hands and feet tingling? Could it be a vitamin B12 deficiency?

When you are sitting at your desk when you suddenly notice a strange sensation in your feet. It feels like tiny pins are pricking your toes. You move your legs, change your sitting position and wait for it to disappear. A few minutes later, it settles.

Then, a few days later, you experience something similar in your fingers. Sometimes it feels like tingling, sometimes like numbness, and occasionally there's a slight burning sensation.

You may initially blame your sitting posture, a long day at work or the way you've been sleeping. But when the sensation keeps returning, a question starts coming up: Could I be deficient in vitamin B12?

It's a possibility worth investigating. Vitamin B12 plays an important role in maintaining healthy nerve cells and producing red blood cells. When your body doesn't have enough of it, the effects can extend beyond tiredness or weakness and may involve the nervous system.

But here's the important part: tingling hands and feet do not automatically mean you have a vitamin B12 deficiency. Several other conditions can produce similar sensations. The key is understanding the pattern and finding out what's affecting your nerves.

Start with the sensation: What exactly is happening when your hands and feet tingle?

The medical term for an unusual sensation such as tingling, pins and needles or numbness is paraesthesia.

You might experience it in different ways. Sometimes it feels like tiny electric shocks running through your fingertips. At other times, your feet may feel partially numb, as though you're walking on a thick layer of fabric. Some people describe a burning or prickling sensation, even when nothing is physically touching the affected area.

These sensations happen when the nerves responsible for carrying information between your body and brain are irritated, damaged or not functioning normally.

Think of your nerves as communication wires. They carry messages about touch, temperature, pain, movement and position. When these signals are disrupted, your brain may receive unusual information. That's why you can feel tingling, burning or numbness without anything actually touching your skin.

One possible reason for this disruption is peripheral neuropathy, a condition involving damage to the peripheral nerves. Vitamin B12 deficiency is one potential cause, but diabetes, nerve compression, certain medications, alcohol-related nerve damage and other conditions can also contribute.

The first step, therefore, isn't to assume you need a B12 supplement. It's to understand why those nerve signals may be changing.

Follow the connection: Why does vitamin B12 matter so much to your nerves?

Vitamin B12, also known as cobalamin, is an essential nutrient involved in several important processes in your body. It supports DNA production, red blood cell formation and the normal functioning of the nervous system.

One of its important roles is supporting the maintenance of myelin, the protective covering around many nerve fibres. You can think of myelin as the insulation around an electrical wire. It helps nerve signals travel efficiently.

When vitamin B12 levels become too low, the normal functioning of nerves can be affected. Over time, this may lead to symptoms such as tingling, numbness, reduced sensation, muscle weakness and difficulty maintaining balance.

The problem isn't limited to your hands and feet. Some people also experience difficulty concentrating, memory changes, unusual fatigue, visual disturbances or changes in mood.

This is why B12 deficiency can sometimes be mistaken for general tiredness or stress. A person may visit a doctor because they feel unusually exhausted, while the underlying deficiency is also affecting their nerves.

Another important detail: you do not necessarily need to have anaemia to experience neurological symptoms. The absence of low haemoglobin does not rule out B12 deficiency.

The Indian data: How common is vitamin B12 deficiency?

Vitamin B12 deficiency has received considerable attention in India, particularly because of dietary patterns and the challenges of identifying deficiencies before symptoms become obvious.

A 2021 systematic review and meta-analysis published in the Journal of Nutritional Science examined micronutrient deficiencies across Indian populations. It included 270 original research articles covering different micronutrients, with 26 studies contributing to the pooled vitamin B12 analysis.

The researchers estimated an overall pooled B12 deficiency prevalence of 53% (95% confidence interval: 41% to 64%) in the populations represented by those studies.

The age-group analysis estimated:

• 48% prevalence among adults over 18.

• 57% among participants under 18.

• 68% in studies where the age group was not specified.

These figures are striking, but they need careful interpretation. The researchers highlighted the lack of national prevalence data, and the included studies varied in their populations, locations and diagnostic cut-offs. The estimates should not be interpreted as proof that 53% of every person in India is B12 deficient.

You can read the full Indian systematic review and meta-analysis of micronutrient deficiencies to understand the study selection and statistical findings.

There is also a more recent example from clinical research. A study published in the Journal of International Medical Sciences Academy in 2024 examined vitamin B12 levels among 15,837 asymptomatic individuals undergoing health check-ups in North India. The study is particularly interesting because it focused on people who were not necessarily seeking medical attention for symptoms.

However, the publicly available article summary does not provide the complete numerical results, so it would be misleading to quote a deficiency percentage from it here.

The broader message from this research is that vitamin B12 status deserves attention even when someone feels relatively healthy. But population-level estimates cannot tell you whether your own tingling is caused by a deficiency. That requires individual assessment.

A closer look at an Indian hospital study: What did doctors observe in patients with tingling?

A January 2025 report by India Today discussed a study conducted at K. J. Somaiya Medical College and Hospital in Mumbai. The research included 180 patients aged 18 to 70 who had both low haemoglobin and low vitamin B12 levels.

The findings offer an interesting look at how B12 deficiency can affect the body:

• Persistent fatigue was reported by 66.7% of participants.

• More than half reported neurological symptoms such as tingling and numbness in their hands and feet.

• The average haemoglobin level was 9.7 g/dL.

• After six weeks of B12 treatment, the average haemoglobin increased to 12.6 g/dL.

These findings are useful because they show how neurological symptoms can appear alongside blood-related changes in people with confirmed deficiency.

But there is an important limitation: these were patients already selected for low haemoglobin and low B12 levels. They were not a random sample of the Indian population. The results cannot tell us how common B12-related tingling is among everyone experiencing numbness.

You can read the India Today report on the Mumbai study and its findings.

If you eat normally, how can you still become deficient in vitamin B12?

This is one of the more confusing aspects of B12 deficiency. You may feel that your diet is reasonably balanced, yet your body may still not be getting or absorbing enough of the vitamin.

There are two broad possibilities: your intake may be insufficient, or your body may have difficulty absorbing the vitamin.

Your diet may not provide enough B12. Vitamin B12 occurs naturally mainly in animal-based foods such as milk, curd, eggs, fish, meat and poultry. People following strict vegetarian or vegan diets may have a higher risk if they do not regularly consume fortified foods or appropriate supplements.

This does not mean every vegetarian is deficient. It means that dietary intake needs attention, particularly when there are other risk factors.

Your body may not absorb B12 properly. Even when your diet contains enough B12, certain digestive conditions can interfere with absorption. Autoimmune gastritis, pernicious anaemia, some intestinal disorders and certain stomach or intestinal surgeries can affect the process.

Some long-term medications can contribute. Metformin, commonly prescribed for type 2 diabetes, can affect vitamin B12 levels. Long-term use of acid-reducing medicines, particularly proton pump inhibitors, may also affect absorption in some people.

An October 2025 report by The Economic Times highlighted doctors' concerns about the association between commonly used diabetes and acidity medications and B12 deficiency. This is especially relevant because people may not connect a medication they have taken for years with new neurological symptoms.

The report is available here: Doctors discuss common medicines that may affect vitamin B12 absorption.

If you take metformin or acid-reducing medication, do not stop it because of this possibility. Discuss your symptoms and whether testing is appropriate with your doctor.

But what if it's not vitamin B12? Other conditions can cause similar symptoms

Tingling is a symptom, not a diagnosis. Several conditions can affect the nerves and produce sensations that look very similar to B12 deficiency.

Here are some possibilities worth understanding:

Diabetes-related nerve damage: High blood sugar over time can damage peripheral nerves. Tingling, burning or numbness often begins in the feet and may gradually move upwards. This is one of the common causes of peripheral neuropathy.

Nerve compression: If a nerve becomes compressed or irritated, you may experience tingling in a specific part of your body. Carpal tunnel syndrome, for example, can cause numbness and tingling in the thumb, index and middle fingers. Problems involving the neck or lower back can also affect nerves travelling into the arms or legs.

Other nutritional deficiencies: Low levels of certain other nutrients, including vitamin B1, vitamin B6 or copper, can also affect nerve function. Interestingly, excessive vitamin B6 supplementation can itself cause peripheral neuropathy.

Thyroid and kidney conditions: Certain metabolic and systemic conditions can affect peripheral nerves and contribute to unusual sensations.

Medication-related nerve damage: Some medicines, including particular chemotherapy drugs, can affect nerve function.

The pattern can offer clues, but it cannot establish the cause by itself. For example, tingling in both feet may suggest a different pattern from numbness limited to the fingers of one hand. A doctor will consider the distribution, duration, associated symptoms and medical history together.

When should you stop guessing and get tested?

If tingling or numbness keeps returning, lasts longer than expected or gradually becomes more noticeable, arrange a medical assessment.

A doctor may start with a neurological examination, checking your sensation, muscle strength, reflexes, balance and coordination. They may also ask about your diet, medication use, digestive health, diabetes history and any previous surgery.

A blood test measuring vitamin B12 is commonly used as an initial investigation. Depending on your results and symptoms, your doctor may also recommend a complete blood count, blood glucose or HbA1c, thyroid function, kidney function and other tests.

Sometimes, a B12 result falls into an uncertain range. In those situations, a doctor may consider additional tests such as methylmalonic acid (MMA) to help clarify whether a deficiency is present.

The 2024 NICE guideline on vitamin B12 deficiency provides detailed recommendations on recognising symptoms, identifying risk factors, choosing tests and managing confirmed deficiency.

It makes an important point: vitamin B12 deficiency should not be ruled out simply because someone does not have anaemia or enlarged red blood cells. Neurological symptoms can occur without those typical blood-count changes.

If you have significant neurological symptoms, such as worsening balance, difficulty walking or progressive weakness, seek prompt medical attention. A doctor may need to begin treatment while investigations are still underway rather than waiting for every result.

What happens if B12 deficiency is left untreated?

Vitamin B12 deficiency is generally treatable, but the timing of treatment matters.

If the deficiency continues, nerve damage can become more significant. Some people may develop worsening numbness, reduced sensation, muscle weakness, poor coordination or difficulty maintaining balance. In more advanced cases, walking can become difficult.

This is why persistent tingling should not be ignored, particularly when it is accompanied by weakness, changes in balance or other neurological symptoms.

The encouraging part is that many symptoms improve once the deficiency is identified and treated appropriately. However, recovery varies. Blood-related changes may improve sooner, while neurological symptoms can take longer. If nerve damage has been present for a long time, some effects may not completely reverse.

Treatment depends on why the deficiency occurred. Some people can be treated with oral vitamin B12 supplements, while others may need injections, particularly when absorption is impaired or neurological symptoms are significant. People with certain irreversible causes may require lifelong replacement.

The right treatment plan should be based on the underlying cause and clinical assessment, not simply on how much tingling you experience.

Can you prevent vitamin B12 deficiency through food?

For people whose deficiency is related to insufficient dietary intake, improving the amount of B12 in their diet can help.

Some useful sources include:

• Milk, curd and other dairy products.

• Eggs.

• Fish and seafood.

• Meat and poultry.

• Foods fortified with vitamin B12, including certain breakfast cereals and plant-based alternatives.

For people following vegetarian or vegan diets, fortified foods and appropriate supplements may be important sources. However, if the problem is poor absorption, dietary changes alone may not be sufficient.

It is also worth avoiding the temptation to start high-dose supplements or injections without understanding the cause. If you have symptoms, getting tested before starting supplements can help preserve the usefulness of your initial test results.

For a more detailed explanation of B12 sources, absorption and deficiency, the US National Institutes of Health Office of Dietary Supplements vitamin B12 fact sheet is a useful reference.

One important exception: When tingling is an emergency

Most recurring tingling sensations are not emergencies, but certain neurological symptoms should never be dismissed as a possible vitamin deficiency.

If you suddenly develop numbness or weakness, especially on one side of your body, facial drooping, difficulty speaking, sudden vision changes, severe dizziness or loss of coordination, seek emergency medical help immediately. These can be signs of a stroke.

Similarly, rapidly worsening weakness, new difficulty walking, or loss of bladder or bowel control alongside numbness needs urgent medical assessment.

Do not wait for a vitamin test or assume that taking a supplement will solve these symptoms.

Don't just focus on the tingling. Find out what is causing it.

A strange sensation in your hands or feet may seem like a small inconvenience at first. But when it keeps returning, it is worth understanding what your body is trying to tell you.

Vitamin B12 deficiency is one possible explanation, particularly if you have a restricted dietary intake, certain digestive conditions or long-term use of medications that can affect absorption. But diabetes, nerve compression and other medical conditions can produce similar symptoms.

The most useful next step is not to guess or start supplements randomly. It is to look at the pattern, consider your risk factors and get the appropriate tests.

And remember, you do not need to wait until numbness becomes severe before seeking medical advice.

Understand Your Health Patterns with Clyvera

Sometimes, symptoms appear in different ways and at different times. You might experience tingling in your feet one week, unusual tiredness the next, and difficulty concentrating later. It can be difficult to know whether these experiences are connected or what information is important to share with your doctor.

Clyvera helps you explore health questions, understand possible symptom patterns and organise your observations before speaking with a healthcare professional.

It does not diagnose vitamin B12 deficiency or replace medical testing and professional care. But it can help you approach your health questions with more clarity and prepare for a more informed conversation.

Explore Clyvera and take a more informed approach to understanding your health.