Treatments: Goiter (Enlarged Thyroid)

This page describes how goiters, including multinodular and substernal goiters, are monitored and treated.

This page describes how an enlarged thyroid gland (goiter) is treated, including goiters made up of many lumps (multinodular goiter) and goiters that grow downward behind the breastbone (substernal or retrosternal goiter). The choice depends on the goiter's size, whether it causes symptoms, whether the thyroid is making too much hormone, and each person's overall health and preferences. Treatment decisions are made together with a thyroid specialist (endocrinologist) and, when surgery is considered, a thyroid surgeon. The condition itself is described on the thyroid goiter conditions page.

How Treatment Is Decided

Before choosing a treatment, the care team usually checks:

• Thyroid blood tests to see whether the gland is working normally, is underactive or is overactive.

• Ultrasound and sometimes a CT scan to measure the goiter, see whether it presses on the windpipe or swallowing tube, and find any nodules that need a closer look.

• A needle biopsy of suspicious nodules to make sure they are not cancer.

The goal is to relieve or prevent symptoms, correct any hormone problem, and make sure nothing worrisome is being missed.

Watchful Waiting With Ultrasound Monitoring

For a goiter that is not causing symptoms, is not overactive and has no worrisome nodules, the usual choice is no treatment at all, just regular monitoring. Many thyroid specialists prefer this approach because most goiters grow slowly and many never cause problems.

Monitoring usually means a repeat ultrasound after about 1 to 2 years, then at longer intervals if the gland is stable. Follow-up may happen sooner for larger goiters or nodules with features that need closer watching. A nodule is generally considered to have grown meaningfully only when it increases substantially in size (for example, a clear increase in two or more measurements, or more than about a 50% increase in volume). Growth, new symptoms or new worrisome findings may prompt a repeat biopsy or a switch to active treatment.

Thyroid Hormone and Iodine Considerations

• Thyroid hormone (levothyroxine) to shrink a goiter is generally not used. In the past, thyroid hormone was given in doses meant to lower thyroid-stimulating hormone and shrink the gland. Results are modest, the gland tends to grow back once the medicine is stopped, and pushing hormone levels too high can strain the heart and weaken bones, an especially important concern in older adults.

• Thyroid hormone replacement is appropriate when the thyroid is underactive. This corrects the hormone deficiency, a different goal from shrinking the gland. See treatment of hypothyroidism.

• Iodine. Goiters are strongly linked to iodine deficiency, and adequate dietary iodine helps prevent them. A daily supplement containing the standard amount of iodine may be used if intake is inadequate. However, iodine supplements are not a standard treatment for an established nodular goiter, and a sudden large increase in iodine can trigger an overactive thyroid in some people.

Treating an Overactive (Toxic) Goiter

Some multinodular goiters develop areas that make thyroid hormone on their own, causing an overactive thyroid. When this happens, treatment is needed. The main options are radioactive iodine or surgery, often along with medicines to control symptoms and hormone levels in the meantime. See treatments for hyperthyroidism.

Radioactive Iodine

Radioactive iodine is taken by mouth as a capsule or liquid. The thyroid absorbs the iodine, and the radiation gradually shrinks the gland and calms overactivity. It is a well-established non-surgical option, often the first choice for an overactive nodular goiter, and it can also reduce the size of a non-overactive goiter by roughly a third or more over about a year.

• It works more slowly than surgery, and more than one treatment is sometimes needed, because large nodular goiters take up iodine unevenly.

• A medicine called recombinant human TSH is sometimes given beforehand to improve the response; this is an off-label use and can occasionally cause temporary swelling and inflammation of the gland.

• Over time, the thyroid may become underactive, which is treated with daily thyroid hormone.

• Radioactive iodine is not used during pregnancy or breastfeeding, and certain precautions around other people apply for a short time afterward.

Surgery (Thyroidectomy)

Thyroidectomy removes part or all of the thyroid. Its main advantages are immediate and reliable relief of pressure symptoms and the ability to examine the removed tissue under the microscope. Removing the whole gland (or nearly all of it) is often preferred for a large goiter. See also extent of thyroid surgery.

Surgery is favored for:

• Compressive symptoms, such as trouble breathing, shortness of breath when lying flat, noisy breathing or difficulty swallowing. These are more common with very large goiters and with substernal goiters, and breathing and swallowing usually improve after surgery.

• A goiter that keeps growing, a nodule that is suspicious for or confirmed as cancer, or a large goiter causing cosmetic concern.

• An overactive goiter when surgery is preferred over radioactive iodine.

Substernal (retrosternal) goiter. When a goiter extends down behind the breastbone, surgery is usually advised even without symptoms, because these goiters tend to keep growing, can affect breathing and need examination to rule out cancer. The great majority are removed entirely through a standard incision at the base of the neck, with no need to open the chest. Occasionally, when the goiter reaches well down into the chest, part of the breastbone may need to be divided (a sternotomy) to remove it safely. Imaging can usually show beforehand whether a chest approach might be needed, and this is discussed in advance.

Preparation is described in the thyroidectomy surgery packet.

Recovery After Surgery

• Many people stay in the hospital overnight so the neck and breathing can be watched, particularly after removal of a large or substernal goiter.

• The neck incision is closed carefully to leave as fine a scar as possible. Mild neck stiffness, a sore throat and some swelling or discomfort are common early on and improve over days to weeks.

• Recovery is usually longer and more involved if the breastbone had to be divided.

• If the entire thyroid is removed, lifelong daily thyroid hormone is needed, with blood tests to set the correct dose. Calcium and vitamin D may be needed for a time if the parathyroid glands are temporarily affected.

More detail is on the thyroidectomy recovery page.

Risks of Surgery

Thyroid surgery is generally safe, especially with an experienced surgeon, but every operation carries some risk:

• Bleeding in the neck, including a blood clot that can press on the airway soon after surgery, one reason for close monitoring.

• Voice changes or hoarseness from irritation or injury to the nerves that control the voice box; usually temporary but occasionally lasting.

• Low blood calcium from the nearby parathyroid glands being bruised or disturbed, causing tingling or muscle cramps; usually temporary and treated with calcium and vitamin D, but occasionally long-lasting.

• Less common issues such as infection or, rarely, air around the lung.

These risks are slightly higher for very large and substernal goiters because the dissection is more extensive, which is why the experience of the surgical and anesthesia team matters.

Long-Term Follow-Up

• After watchful waiting or medication: periodic ultrasound and blood tests continue, with the schedule based on the goiter's size and stability.

• After radioactive iodine: thyroid blood tests are checked regularly, since the gland may slowly become underactive over months to years and need hormone replacement.

• After surgery: blood tests confirm the thyroid hormone dose is correct, and calcium is checked if the parathyroid glands were affected.

When Urgent Care Is Needed

Difficulty breathing, noisy breathing, trouble swallowing, rapid neck swelling, severe bleeding from the incision, or numbness and cramping around the mouth, hands or feet after surgery are reasons to contact the care team or seek emergency help.