What Is a Thyroidectomy? Total vs Partial, Why It's Done, and Life After

A thyroidectomy is an operation to remove all or part of the thyroid gland at the front of your neck. A total thyroidectomy removes the whole gland, which means taking a thyroid hormone tablet, levothyroxine, every day for life. A hemithyroidectomy removes one half, and most people never need a tablet afterwards. It is done for thyroid cancer or a lump that might be cancer, a goitre pressing on the windpipe or food pipe, or an overactive thyroid. Most people go home within one or two days.

If you have just been told you need thyroid surgery, or have recently had it, here is what the operation involves, why it is done, how surgeons decide how much to remove, and what life looks like afterwards. For the day-by-day side, our guide to thyroidectomy recovery, week by week goes into detail.

When to get help straight away

After any thyroid operation, growing swelling in your neck, trouble breathing or trouble swallowing needs urgent help: call 000. This is uncommon, and most of it happens while you are still in hospital.

After a total thyroidectomy, tingling around your lips or in your fingers, or muscle cramps, in the first few days can mean low calcium. Contact your surgical team or GP the same day, or go to an emergency department if it is severe. Our guide to tingling and calcium after thyroidectomy explains more.

What does the thyroid do?

The thyroid is a butterfly-shaped gland in the front of your neck, just below the Adam's apple. It has two halves, called lobes, joined by a narrow bridge called the isthmus. It uses iodine from food to make thyroid hormone, which sets the pace of your metabolism, including your heart rate and body temperature.

Behind it sit the small parathyroid glands, which control your calcium level, and the nerves to your voice box run right alongside. Those neighbours explain most of the risks of surgery.

Types of thyroidectomy

"Thyroidectomy" covers several different operations:

• Total thyroidectomy: the whole thyroid, both lobes and the isthmus, is removed.
• Near-total thyroidectomy: almost all of the thyroid is removed, with a small amount of tissue left behind.
• Hemithyroidectomy (also called a lobectomy or partial thyroidectomy): one lobe is removed and the other half stays. When it is done because a needle biopsy could not give a clear answer, it is sometimes called a surgical biopsy.
• Completion thyroidectomy: a second operation to remove the remaining half, if tests on the first half show it is needed.
• Lymph node removal (neck dissection): nearby lymph nodes can be removed during either operation, usually because scans or biopsies show thyroid cancer has spread to them. It is done through the same cut.

Why is a thyroidectomy done?

Australian endocrine surgeons and healthdirect list the same main reasons:

• Thyroid cancer, or a lump that might be cancer. A fine needle biopsy usually comes first. When the biopsy can't give a clear answer, removing the lump is often the only way to know for sure. About 4,300 people in Australia are diagnosed with thyroid cancer each year, according to Cancer Council.
• A goitre causing pressure. An enlarged thyroid can press on the windpipe or food pipe, causing trouble swallowing or breathing or a persistent cough. Some goitres grow down behind the breastbone.
• Nodules or lumps. Some are removed even when cancer has not been confirmed, for example when a needle biopsy cannot give a clear answer.
• An overactive thyroid, including Graves' disease. Surgery is one of three standard options, alongside antithyroid tablets and radioactive iodine.

Medicare records alone show more than 6,000 thyroid operations a year in Australia.

Total or half: how the decision is made

For thyroid cancer, guidance has shifted towards removing less. The 2025 American Thyroid Association guideline recommends removing just one lobe as the first operation for cancers 2 cm or smaller that have not grown outside the thyroid or spread, unless there is cancer on both sides or another reason to take the whole gland. For low-risk cancers of 2 to 4 cm, half is often preferred because the risks are much lower, though a total can still be the better fit. For larger cancers, cancers growing beyond the thyroid, or cancer already in the lymph nodes, the whole gland comes out along with the affected nodes.

Some very small papillary cancers do not need surgery straight away. They can be watched with regular ultrasounds instead, which is called active surveillance.

Australian practice has moved with it. Medicare data show operations removing part of the thyroid rose from about 2,900 in 2014 to about 3,900 in 2023, while total thyroidectomies fell from about 2,900 to 2,500.

If you have half removed and the final tests show higher-risk features, your team may recommend a completion thyroidectomy, sometimes followed by radioactive iodine. For Graves' disease, the evidence favours removing the whole thyroid: across 23 studies, a total thyroidectomy made a return of the overactive thyroid far less likely than leaving some tissue behind, at the cost of slightly more calcium problems.

What happens during the operation

A thyroidectomy is done under general anaesthetic, so you are asleep. The surgeon makes a cut in a skin crease at the front of your neck, about 2 to 3 cm above the collarbone. Cancer Council says the cut is usually 3 to 5 cm long. The operation usually takes one to two hours, depending on the type.

The surgeon works carefully around the voice nerves and the parathyroid glands, and sometimes moves a parathyroid gland into a nearby muscle to keep it working. The removed tissue is examined under a microscope, which confirms what it was and guides any next steps.

Most people stay in hospital one or two nights, and some go home the same day or the next.

Risks of thyroid surgery

According to healthdirect, a thyroidectomy is generally a safe operation. Along with the general risks of any anaesthetic and surgery, three risks are specific to it:

• Bleeding into the neck: about 1 to 2 in 100 operations, across 25 studies. Most happens within hours, while you are still being watched in hospital, and is usually fixed with a second operation.
• Voice changes: temporary weakness of a voice nerve affects about 1 in 10 people in pooled studies. Permanent hoarseness is uncommon, up to 1 to 2 in 100 according to Australian endocrine surgeons.
• Low calcium: mainly a risk when both sides of the thyroid are operated on. After a total thyroidectomy it is temporary in about 1 in 4 people, and permanent in about 1 in 100. The risk is higher if lymph nodes are also removed.

Each of these is more likely after a total thyroidectomy than after a half, which is part of why guidelines now favour removing half where that is safe. Higher-volume surgeons also have lower complication rates, so it is fair to ask how many of these operations your surgeon does.

Life after a total thyroidectomy

Without a thyroid, your body cannot make thyroid hormone, so you will take levothyroxine every day for the rest of your life. It is often started within a day or so of surgery. Levels take about six weeks to settle, so your first thyroid test is usually around six weeks after surgery, with some services saying six to eight. It is very common for the first dose to need adjusting, and finding the right dose can take a few months.

After thyroid cancer, your dose also keeps TSH, a pituitary hormone that can encourage thyroid cancer to grow, at the level your specialist sets.

Levothyroxine is taken with water on an empty stomach. The Australian label says at least 30 minutes, and preferably 60, before food. Calcium, iron and other mineral supplements need to be kept several hours away from it.

Some people with thyroid cancer go on to have radioactive iodine a few weeks or months after surgery. Not everyone does now: the 2025 guideline no longer recommends it routinely for low-risk cancers. Our guide to radioactive iodine and the low-iodine diet explains more.

Life after a hemithyroidectomy

After half a thyroidectomy, the remaining lobe often makes enough hormone on its own. Not always: in a review of 66 studies by Sydney researchers, about 1 in 4 people ended up taking thyroxine, most often within the first three to six months. Australian endocrine surgeons put it at around 15%. The chance is higher if your TSH was 2 or above before surgery, or if you have thyroid antibodies or Hashimoto's. That is why your levels are checked over the months after surgery.

Recovery is usually lighter after a half, and low calcium is rare. Our guide to whether you will need thyroxine after a hemithyroidectomy covers this in more detail.

How people feel afterwards

Many people feel better than before surgery within weeks to months, especially after an operation for an overactive thyroid or a goitre that was pressing on things.

After a total thyroidectomy, though, a sizeable minority take months to feel themselves again, even when their results are in range. In an Italian study, about 1 in 3 people reported worse fatigue six months after a total thyroidectomy, compared with almost no one after a half. In a Newcastle study of Australians after thyroid cancer surgery, physical and mental wellbeing scores were still below population norms a year later, even though 82% had thyroid levels in range.

If that is you, it is a recognised experience and worth raising with your doctor rather than pushing through alone. Our guide to fatigue after thyroidectomy covers what to ask about.

Where ThyroBase fits

Your surgical team guides recovery, and no food or powder speeds healing or changes how your thyroid medication works. Once recovery has settled, ThyroBase is a daily morning and evening plant-based drink powder, a food rather than a medicine, that sits alongside your thyroid medication, never instead of it. Both serves contain minerals, so keep them several hours away from your tablet. The morning serve contains added vitamin D, so if you are on prescribed calcium or calcitriol, ask your team first. The morning serve also carries trace iodine from spirulina, so pause it during any low-iodine diet before radioactive iodine. Here is who ThyroBase is, and is not, designed for.

How much of the thyroid is removed, and why, shapes almost everything that comes after.

Frequently asked questions

What is the difference between a total and a partial thyroidectomy?

A total thyroidectomy removes the whole thyroid and means taking levothyroxine every day for life. A partial thyroidectomy, usually a hemithyroidectomy, removes one half; about 1 in 4 people need a thyroid tablet afterwards and the rest do not. Risks such as low calcium and voice problems are lower after a half.

How long does a thyroidectomy operation take?

Usually one to two hours under general anaesthetic, depending on the type of operation. Most people stay in hospital one or two nights, and some go home the same day or the next.

Will I need medication after a thyroidectomy?

After a total thyroidectomy, yes: levothyroxine every day for life, with the first dose check usually around six weeks after surgery. After a hemithyroidectomy most people do not, but about 1 in 4 do, so your levels are checked over the following months.

Is a thyroidectomy major surgery?

It is done under general anaesthetic and is generally a safe operation, and most people are back to everyday life within one to two weeks. The main specific risks are bleeding in the neck, voice changes that are usually temporary, and low calcium after a total thyroidectomy.

Why would someone have their thyroid removed?

The main reasons are thyroid cancer or a lump that might be cancer, a goitre pressing on the windpipe or food pipe, and an overactive thyroid such as Graves' disease. Your surgeon will explain which applies to you.

The honest takeaway

A thyroidectomy is a common, well-understood operation, and the biggest difference between one person's experience and another's is how much is removed and why. A half often means no tablet and a lighter recovery; a total means levothyroxine for life and a few months of getting the dose right. Most people do well, and some take longer to feel like themselves. If you still do not feel right once your results are in range, keep talking to your doctor.

ThyroBase is a nutritional supplement and is not intended to diagnose, treat, cure, or prevent any disease. It is designed to sit alongside your thyroid medication, not replace it. This article is general information, not medical advice. Never start, stop or change a supplement or prescription medication without speaking to your doctor or pharmacist first.

References

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