A 29-year-old female asked:
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can vitamine b12 deficienty cause an overactive thyroid?

1 doctor answer
Dr. Susan Wingo
32 years experience Endocrinology
Not Exactly: The most common cause of both an overactive thyroid and B12 deficiency is autoimmunity, in which the immune system mistakenly attacks one's own tissues and proteins. Having 1 auto-immune condition makes it more likely for a person to develop a 2nd autoimmune condition, but it wouldn't be true to say that one condition caused the other. The underlying autoimmunity caused both.
Answered on Oct 31, 2017

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