The long-term effects of thyroidectomy depend on how much of the thyroid is removed.
If only part of your thyroid is removed, the remaining portion typically takes over the function of the entire thyroid gland, and you might not need thyroid hormone therapy.
If your entire thyroid is removed, your body can't make thyroid hormone and without replacement you'll develop signs and symptoms of underactive thyroid (hypothyroidism). As a result, you'll need to take a pill every day that contains the synthetic thyroid hormone levothyroxine (Levoxyl, Synthroid, Unithroid).
This hormone replacement is identical to the hormone normally made by your thyroid gland and performs all of the same functions. Your doctor will determine the amount of thyroid hormone replacement you need based on blood tests.
Aug. 30, 2017
- Townsend CM Jr, et al. Endocrine. In: Sabiston Textbook of Surgery: The Biological Basis of Modern Surgical Practice. 20th ed. Philadelphia, Pa.: Elsevier; 2017. https://www.clinicalkey.com. Accessed July 6, 2017.
- Jameson JL, et al., eds. Surgery of the thyroid. In: Endocrinology: Adult and Pediatric. 7th ed. Philadelphia, Pa.: Saunders Elsevier; 2016. https://www.clinicalkey.com. Accessed July 6, 2017.
- Thyroid surgery. American Thyroid Association. https://www.thyroid.org/thyroid-surgery/. Accessed July 6, 2017.
- Haugen BR, et al. 2015 American Thyroid Association management guidelines for adult patients with thyroid nodules and differentiated thyroid cancer. Thyroid. 2016;26:1.
- Wang TS, et al. Initial thyroidectomy. https://www.uptodate.com/contents/search. Accessed July 6, 2017.
- Nippoldt TB (expert opinion). Mayo Clinic, Rochester, Minn. July 11, 2017.