This is a question that crops up from time to time and this Fast Quiz popped up from Medscape recently and again today - I thought others would be interested,
reference.medscape.com/view...
If you read through you will find a question about drugs that interfere with assessment. One third of patients are on something that does this - and this does lead to poorer management of the thyroid management. In our case, it may well contribute to the fatigue.
In a study prednisolone was found to be one of the most common culprits.
medscape.com/viewarticle/94...
So if you are on thyroid medication and you feel there is something not right even though your GP insists the lab results are fine - maybe you are right!