5 doctors weighed in:

Can vitamine B12 deficienty cause an overactive thyroid?

5 doctors weighed in
Dr. Susan Wingo
Internal Medicine - Endocrinology
4 doctors agree

In brief: 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.

In brief: 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.
Dr. Susan Wingo
Dr. Susan Wingo
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