Signs of Vitamin B12 Deficiency That Are Often Overlooked
Vitamin B12 deficiency can develop gradually, so its symptoms are sometimes mistaken for aging, stress, or being tired. If untreated for a long time, it can cause potentially irreversible nerve damage.
10 signs to know
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Persistent fatigue or weakness — especially when it isn’t explained by poor sleep or exertion.
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Numbness or tingling — particularly in the hands or feet.
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Balance problems or unsteadiness — nerve involvement can affect coordination.
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Muscle weakness — sometimes accompanied by difficulty walking.
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Pale or yellowish skin — B12 deficiency can cause certain types of anemia.
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A sore, red, or unusually smooth tongue — sometimes with mouth ulcers.
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Shortness of breath or a racing heartbeat — particularly when anemia is significant.
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Difficulty concentrating or “brain fog” — cognitive changes can occur.
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Mood changes — depression, irritability, or unusual emotional changes may occur.
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Vision changes — uncommon but possible when the optic nerve is affected.
Who is more likely to become deficient?
Risk is higher in people with pernicious anemia, certain stomach or intestinal disorders, previous gastrointestinal surgery, or diets very low in animal-derived foods. Long-term use of some medications, including metformin and acid-suppressing medicines, can also reduce B12 absorption.
Don’t diagnose it from symptoms alone
These symptoms have many possible causes. A healthcare professional can check blood levels of B12 and related markers, along with a blood count, to determine whether deficiency is actually present.
If you develop new numbness, weakness, walking difficulties, or significant cognitive changes, don’t wait for symptoms to become severe. Early diagnosis and treatment can prevent permanent neurological complications.
