The thyroid is a bit confusing to understand. When the TSH is low, you are on the hyperthyroid side which means you have a LOT of thyroid hormone in your system.
An elevated TSH indicates hypothyroid, or a low amount of thyroid hormone in your body.
TSH means Thyroid Stimulating Hormone and it is a hormone produced by the pituitary gland in the brain. TSH's job is to stimulate the thyroid cells in the thyroid gland to produce thyroid hormone in response to the body's need.
After surgery & radiation for thyroid cancer, we must get our thyroid hormone from pills.
After thyroidectomy for thyroid cancer, we are kept on the hyperthyroid (low TSH) range to keep any possible thyroid cells in the body from becoming stimulated. It is assumed that any thyroid cells in the body which have survived surgery and radiation are cancerous. High levels of thyroid hormone (synthroid) will keep these cells inactive.
You can read this article here for more info - it's pretty good but a bit wordy. thyroid.about.com/od/thyroidbasicsthyroid1
That said, it's important to understand that people who are have high levels of thyroid hormone do not always necessarily feel "energetic". Sometimes our bodies are working so hard, we are simply exhausted. This was the case for me and I ended up lowering my dose a bit and have felt better. Thyroid hormone levels that are too high can cause us to have sleep problems and feel very run down and tired.
It is simply not true that being hyperthyroid will cause weight loss in all people.
I would highly recommend you speak with your endo about your levels. You may need to actually lower your medicine a bit. Make sure you consult with an endocrinologist to get your dosages correct - this may take some time so be patient!
Feel free to PM me if you want to discuss more in private. I also highly recommend visiting www.thyca.org
for more information on thyroid cancer.
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