Subclinical hypothyroidism is a condition that can be caused by both iodine deficiency and excessive iodine intake.
Subclinical hypothyroidism is characterized by elevated serum TSH levels, while thyroid hormones are within a laboratory "normal" range.
Elevated TSH levels are also caused by fluoride, even at low intake and at water concentrations below those used in community fluoridation programs.
Comments on current issues in fluoride/thyroid research.
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