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10 Common Signs of Vitamin B12 Deficiency You Shouldn't Ignore
Feeling unusually tired or struggling to concentrate? While these symptoms can be caused by many different health conditions, they may also be early signs of vitamin B12 deficiency. Because vitamin B12 plays a vital role in producing healthy blood cells, supporting brain function and maintaining the nervous system, low levels can affect many parts of the body.
The challenge is that vitamin B12 deficiency often develops gradually, making it easy to mistake the symptoms for stress, ageing or a busy lifestyle. If left untreated, it can lead to more serious complications, including anaemia and permanent nerve damage.
If you'd like to learn more about how this essential nutrient supports your overall health, read our guide on Vitamin B12: Why This Essential Nutrient Matters More Than You Think.
Recognising the Signs of Vitamin B12 Deficiency
Symptoms vary from person to person and often appear slowly over time. The table below outlines some of the most common signs and why they occur.
Sign or Symptom | Why It Happens |
Persistent fatigue | Low vitamin B12 can reduce healthy red blood cell production, limiting the amount of oxygen delivered throughout the body. |
Weakness | Reduced oxygen supply to muscles can make everyday activities feel more tiring. |
Tingling or numbness | Vitamin B12 helps maintain healthy nerves. A deficiency may damage the protective covering around nerve fibres. |
Poor balance | Nerve damage can affect coordination and stability, particularly in older adults. |
Memory or concentration problems | Low vitamin B12 may affect normal brain function, making it harder to focus or remember information. |
Shortness of breath | Anaemia caused by vitamin B12 deficiency can reduce oxygen delivery during physical activity. |
Pale or yellowish skin | Changes in red blood cell production may affect skin colour. |
A sore, swollen tongue | Some people develop inflammation of the tongue, known as glossitis, which can cause discomfort while eating or speaking. |
Mood changes | Low vitamin B12 has been associated with symptoms such as irritability, low mood and depression in some individuals. |
Frequent dizziness | Reduced oxygen delivery to the brain may contribute to light-headedness or dizziness. |
Who Is Most at Risk?
Anyone can develop vitamin B12 deficiency, but some people are more likely to experience low levels.
Higher-Risk Group | Reason |
Adults over 60 | Ageing can reduce the body's ability to absorb vitamin B12 from food. |
Vegetarians and vegans | Vitamin B12 is found naturally in animal-based foods, making dietary intake more challenging. |
People taking metformin | Long-term use may reduce vitamin B12 absorption. |
People taking acid-suppressing medications | Reduced stomach acid can affect vitamin B12 absorption. |
People with digestive disorders | Conditions such as coeliac disease or Crohn's disease can interfere with nutrient absorption. |
When Should You See Your GP?
Occasional tiredness or forgetfulness doesn't necessarily mean you have a vitamin B12 deficiency. However, if symptoms persist, worsen or occur alongside tingling sensations, weakness or balance problems, it's important to seek medical advice.
Your GP can assess your symptoms, review your medical history and arrange a simple blood test if vitamin B12 deficiency is suspected. Early diagnosis is important because prompt treatment can help prevent long-term complications, particularly those affecting the nervous system.
Looking After Your Health
Vitamin B12 deficiency is common, but it is also highly treatable when identified early. Paying attention to persistent symptoms and recognising your personal risk factors can make a significant difference to your long-term health.
At Classic Way Family Practice, our experienced GPs can assess symptoms of fatigue, investigate possible vitamin deficiencies and provide personalised treatment based on your individual health needs. If you've been feeling unusually tired or are concerned about your vitamin B12 levels, book an appointment to discuss your symptoms and take the first step towards better health.
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