It is actually quite amazing how many people have issues with their thyroid gland.
This is the typical natural history
- hyperthyroid, so too much T4 is produced. The thyroid gland also produces a wee bit of T3, but most is converted to the more active form, T3 in the peripheral tissues
Clinical symptoms - thin/losing weight, diarrhoea/more bowel movements, hot, sweating, irregular periods, tachycardia (fast heart rate), nervous, agitated, feeling tired, slight tremors/shaking
You may have elevated levels of cholesterol as well.
- the thyroid gland burns itself out and the person goes hypothyroid, so not enough T4 is released and the hypothalamus releases more TSH.
Clinical symptoms: tired, weight gain, dry skin and hair, brittle nails, constipation, bradycardia (slow heart rate), sensitive to cold, muscle cramps and joint pain
This is the thing, T3 is going to stop TSH (thyroid releasing hormone) to be produced, it is just a part of the feedback.
It often takes months for the thyroid hormones to normalise if they have had some interuption of homeostasis. This is well known when trying to establish the effective dose of thyroxine for patients.
It is also known that patients accidentally put on thyroxine have had full recovery of their thyroid gland when the mistake is realised and they are taken off the drug.
However, if you had a pre-existing sensitivity/condition with your thyroid, using T3 MAY have precipitated a thyroid condition a bit before it would have happened.
You may want to wait a month or a few months and get retested.
Would you mind posting up your results?
I have noticed that what US doctors consider to be low or high is normal in the UK.
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