B12/thyroid: They are different but may share some symptoms. Both have more than 1 cause for dysfunction, both can be due to autoimmune disease, hashimoto's thyroiditis and pernicious anemia. Antibodies cause problems for each condition. B12 def can give numbness in feet and legs, later causing dementia if untreated. Hypothyroidism has many symptoms: fatigue, depression, poor reflexes, skin changes, etc.
Answered 6/24/2014
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