Symptoms of Vitamin B12 Deficiency

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Vitamin B12 deficiency can cause a broad array of symptoms. Those who suspect they may have vitamin B12 deficiency should talk to their doctor about being tested. Symptoms include:i

  • Weakness and fatigue
  • Light-headedness and dizziness
  • Palpitations and rapid heartbeat
  • Shortness of breath
  • A sore tongue that has a red, beefy appearance
  • Nausea or poor appetite
  • Weight loss
  • Diarrhea
  • Yellowish tinge to the skin and eyes
  • Numbness and tingling in the hands and feet
  • Difficulty walking
  • Memory loss
  • Depression



[1] National Institutes of Health. Vitamin B12 Fact Sheet for Consumers. Accessed November 2014.