Our expert says:
thryroid hormone is bound to protein and transported this way in the blood - if for some reason the protein is low or high it may give a distorted view of the thyroid function.
see also http://www.ehealthmd.com/library/hypothyroidism/HYO_causes.html
Eltroxin usually does not cause diarrhoea as side effect - let your dr check this out.
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