If its cancer then the protocol is to put the patient on meds to suppress the TSH. Suppression means enuf thyroid medication to get the TSH under a 1.
As our knowledgeable members have already said, a person with half a thyroid is entirely capable of making sufficient thyroid hormone. However not all thyroids read the owner's manual, and many people will need help. Which means taking thyroid hormone(s).
That's why there are tests... TSH, Free T3, Free T4 to let you know if the dragging feeling and general malaise is caused by insufficient thyroid hormone, or is something else.
And why you need to listen to your body.
Sometimes, sad to say, this means parting ways with your current doctor.
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