Hi, thanks for using healthcare magic
There is an organ in the brain called the pituitary that sends a message to the thyroid gland in the neck to tell it to make thyroid hormone.
The organ in the brain makes
TSH which goes to the thyroid and the presence of the TSH tells the thyroid gland--Make thyroid hormone.
Disease of the thyroid can either have low levels of thyroid hormone coming out of the thyroid gland or high levels.
Graves is an
autoimmune disease which means that the body is essentially fighting against itself.
In Graves the body makes abnormal chemicals (
antibodies) that go to the thyroid gland to tell it make more and more thyroid hormone. In graves, the thyroid hormone levels are increased, this is not the case for you.
You do not likely have graves because your levels are low, this the reason you are taking
hormone replacement, your levels need replacing
Graves is only one type of
thyroid disease, there are more.
I hope this helps