However, the claim that one overlooked vitamin deficiency explains most cases of leg and ankle swelling is misleading. Swelling, also called edema, has many possible causes.
Which vitamin deficiencies may be involved?
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Vitamin B1 (thiamine): Severe deficiency can cause beriberi, which may affect the heart and lead to fluid retention and swelling.
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Vitamin B12: Deficiency can cause anemia and nerve problems, but it is not a common direct cause of swollen ankles.
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Vitamin D: Low levels are associated with various health problems, but evidence does not establish vitamin D deficiency as a common cause of leg edema.
What else causes swollen legs and ankles?
Common possibilities include:
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Standing or sitting for long periods.
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Venous insufficiency, in which blood pools in the legs.
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Certain medications, including some blood pressure medicines.
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Heart, kidney, or liver conditions.
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Blood clots, particularly when swelling suddenly affects one leg.
What should you do?
Don’t start high-dose vitamins or supplements solely to treat swelling. The right approach depends on the underlying cause.
Seek emergency care if leg swelling occurs with chest pain, sudden shortness of breath, or fainting. New swelling in one leg, especially with pain, warmth, or redness, needs urgent medical assessment.
One important question
Are you experiencing swollen legs or ankles yourself, or are you checking whether this health claim is true? If you’re experiencing it, knowing whether the swelling affects one leg or both and how long it has been present can help identify the appropriate next steps.
