Thyroid cancer

A lump in the front of the neck is the usual way this is found. Most thyroid lumps are not cancer, and finding out is straightforward.

What it is

The thyroid is a small butterfly-shaped gland in the front of the neck, just below the voice box. It makes the hormone that sets the body's pace. Thyroid cancer usually begins as a nodule — a lump — in that gland. Most thyroid nodules are not cancer; they are common, and they become more common with age. When a nodule is cancer, it is most often one of the slow-growing types. Unlike the cancers around it, thyroid cancer is not caused by tobacco. The risks that are known are radiation to the neck in the past, particularly in childhood, and thyroid cancer in the family.

Two of the practice's cancer surgeons in the OPD, reading the same open case file with the pages fanned between them.

Worth getting checked

Thyroid cancer often has no symptom at all beyond the lump. These are the ones worth an appointment:

A painless lump or swelling in the front of the neck
A lump that moves up and down when you swallow
A change in the voice that has not settled in a few weeks
A feeling of pressure in the neck, or difficulty swallowing
Glands in the neck that stay swollen
A cough with no other explanation that does not settle

Most thyroid lumps are not cancer. An ultrasound and, where it is needed, a needle test are usually all it takes to find out.

How we find out

A clinical examination, and a blood test.
The doctor feels the gland and the neck while you swallow. A blood test shows how the thyroid is working — which is a separate question from whether a nodule is cancer, and the two are often confused.
An ultrasound of the neck.
A painless scan that shows the size and character of the nodule and whether the lymph nodes nearby look involved. No needle, no radiation.
A fine needle test (FNAC).
A thin needle takes a few cells from the nodule, usually with the ultrasound guiding it. This is the test that settles the question. It takes a few minutes and does not need admission. three to five working days for the report.

A needle test does not spread cancer. And a thyroid nodule found on a scan done for something else is worth checking, but it is not an emergency.

How it is treated here

Surgery.: Removing half the thyroid or all of it, depending on the size, the type, and whether lymph nodes are involved. The nerve to the voice box and the small parathyroid glands sit immediately beside the thyroid, and protecting them is part of the operation.
Radioactive iodine.: A capsule or drink given after surgery in some cases. Thyroid tissue takes up iodine and almost nothing else in the body does, so this treats any remaining thyroid cells and leaves the rest alone. It needs a short stay under radiation-safety rules.
Thyroid hormone tablets.: Once the gland is removed, one tablet each morning replaces the hormone it used to make. In some cases the dose is set a little higher on purpose, to keep any remaining thyroid tissue quiet.
Radiation therapy and drug treatment.: Used in the less common types and in advanced cases, with a Varian Halcyon linear accelerator where radiation is part of the plan. Targeted drugs are considered on tumour characteristics.

Your combination is decided by the tumour board, not by one doctor alone.

What day-to-day life looks like

Honest expectations: most people are in hospital for a short admission around the operation and back to an ordinary routine within a few weeks. The scar sits in a skin crease at the base of the neck and fades over months. If the whole gland is removed, you take one hormone tablet every morning for life — a small tablet, an inexpensive one, and blood tests over the first few months set the right dose. A hoarse or tired voice for a few weeks after surgery is common and usually settles; tell your doctor if it does not. Recovery needs support as well as an operation — with eating, with speech, with movement, and with getting back to ordinary days. Ask your surgeon what yours will need and who can help with it.

Questions we hear every week

I have a lump in my neck. Is it thyroid cancer?

Usually not. Thyroid lumps are common and most are not cancer. An ultrasound, and a needle test if that ultrasound suggests one, will tell you.

Will I have to take tablets for the rest of my life?

If the whole gland is removed, yes — one tablet each morning, on an empty stomach. If only half is removed, many people never need it. Blood tests decide.

Will my voice change after the operation?

The nerve to the voice box runs right beside the thyroid; it is identified and protected during surgery. A hoarse or tired voice for a few weeks afterwards is common and usually settles. A lasting change is uncommon, and your surgeon will go through that risk with you before you consent.

Is radioactive iodine dangerous for my family?

For a few days after the dose you are asked to keep some distance from young children and from anyone pregnant, and the hospital gives you those instructions in writing. After that period there is nothing to stay away from.

Does thyroid cancer come from tobacco?

No. Tobacco causes the cancers of the mouth and throat around it, but not this one. Stopping is still worth it — it lowers your risk of those.

Have a report or a symptom you are unsure about?

Bring it in. If it is nothing, we will tell you it is nothing.

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Medically reviewed by The surgical oncology team, Saurashtra Cancer Care, MCh / DNB Surgical Oncology · August 2026