Thyroid Enlargement · San Diego
An enlarged thyroid does not always need treatment. When it does, the right option depends on whether the goiter is overactive, how large it is, where it sits, and what symptoms it causes.
A goiter is simply an enlarged thyroid gland. It can be smooth and uniformly enlarged (diffuse goiter), or contain one or several nodules (nodular or multinodular goiter). It can make normal amounts of hormone, too much (toxic goiter), or occasionally too little.
Common causes in the U.S. include multinodular goiter, Hashimoto's thyroiditis, and Graves' disease. Iodine deficiency, the classic cause worldwide, is uncommon here.
Many goiters are found incidentally and cause no problems. These are monitored. Treatment is considered when a goiter:
The evaluation includes a TSH blood test, a thyroid ultrasound performed by an experienced examiner, biopsy of any nodule that meets TI-RADS criteria, and sometimes a CT scan without contrast if the goiter extends into the chest.
| Option | Best suited for | Considerations |
|---|---|---|
| Observation | Goiters without symptoms, overactivity, or suspicious nodules | Periodic ultrasound and TSH |
| Radiofrequency ablation (RFA) | One or a few dominant benign nodules causing symptoms or a visible lump | Office procedure, no incision, thyroid function usually preserved; requires benign biopsy; less suited to very large diffuse or substernal goiters |
| Radioactive iodine | Toxic multinodular goiter and toxic adenoma; selected non-toxic goiters in patients who cannot have surgery | Shrinks the gland gradually; can cause hypothyroidism; not used in pregnancy or breastfeeding |
| Surgery (thyroidectomy) | Large, substernal, or compressive goiters; suspicious or indeterminate nodules | Definitive; general anesthesia; total thyroidectomy requires lifelong thyroid hormone; small risk to the voice nerves and parathyroid glands |
What about thyroid hormone pills to shrink a goiter? Levothyroxine "suppression" was once common but is not recommended for benign nodular goiter in iodine-sufficient regions like the U.S.; the shrinkage is modest and the long-term risks to heart rhythm and bone are not justified.
Thyroid artery embolization is offered at a small number of centers. Published experience is still limited, and it is not part of standard guideline-based care at this time.
Many "goiters" turn out to be a gland with one dominant nodule that causes most of the symptoms. When that nodule is benign on biopsy, treating it with radiofrequency ablation can relieve pressure and visible fullness without removing the thyroid.
In our own series of 118 consecutive patients with benign nodules, presented at ENDO 2026, mean nodule volume fell by 75% at six months, with no major complications. See the full results and how the procedure works.
For a large, diffusely enlarged or substernal goiter, surgery usually remains the better choice, and we will tell you so.
Haugen BR, et al. 2015 American Thyroid Association Management Guidelines for Adult Patients with Thyroid Nodules and Differentiated Thyroid Cancer. Thyroid. 2016;26:1–133.
Ross DS, et al. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis. Thyroid. 2016;26:1343–1421.
Schneider DA, Mba UM, Vizcarra Osuna J. Single-Session Trans-Isthmic Radiofrequency Ablation for Benign Thyroid Nodules: Six-Month Outcomes from 118 Consecutive Patients in a U.S. Community Endocrine Practice. ENDO 2026, Chicago.
Written by Darius A. Schneider, MD, PhD, board-certified endocrinologist. Reviewed October 2026.
We will evaluate the gland with our own ultrasound, explain every reasonable option, including leaving it alone, and help you choose.
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