Agree that 20 mcg is very low. I had my thyroid removed 20 years ago as it was very enlarged and also overactive. Since then I'm on 100 mcg a day with blood tests every 6 months to monitor. Seems to be stable and I feel fine.
Some thyroid problems are due to autoimmune conditions, which can cause other problems which the thyroxine won't help! Unfortunately docs often don't look for the underlying cause of thyroid problems- even endocrinologists!
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