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Health condition · Clinically reviewed

Thyroid cancer, papillary, follicular, medullary and anaplastic — modern risk-adapted care.

Differentiated thyroid cancers (papillary, follicular) are highly treatable. Medullary and anaplastic subtypes need specialist care. Modern approach is risk-adapted — active surveillance for very small papillary tumours through to targeted therapy for advanced disease.

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A radiographer guides a patient onto the bed of an advanced 3 Tesla MRI scanner in a London imaging suite

Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced, not summarised

    Every claim is checked against BTA, NICE or a peer-reviewed source you can see at the end.

  • 03

    Updated for 2026

    Reflects current UK guidance on TI-RADS, risk-adapted surgery, RAI and targeted therapy for advanced disease.

Key facts

Thyroid cancer at a glance.

The essentials, in plain English — what it is, the four main types, how it’s diagnosed in the UK today, and how treatment is chosen.

  • What it is

    Cancer arising from the thyroid gland — papillary (~85%), follicular (~10%), medullary (~4%) and anaplastic (~1%).

  • Active surveillance

    Very small papillary microcarcinomas may be safely observed rather than operated on straight away.

  • TSH-suppression

    After thyroidectomy, levothyroxine is dosed to suppress TSH — the level depends on risk group.

  • Radioactive iodine

    RAI is used in selected differentiated thyroid cancers to treat residual and microscopic disease.

  • Targeted therapy

    BRAF and RET inhibitors are transforming outcomes in advanced and anaplastic thyroid cancer.

  • Medullary cancer

    Needs calcitonin monitoring and MEN2 genetic screening — it behaves very differently from the differentiated cancers.

Why this guide matters

Not every thyroid cancer needs the same treatment.

The pathway is risk-adapted. Very small papillary cancers may be observed, most differentiated cancers do well with tailored surgery, and advanced disease now has targeted options.

  • Ultrasound + TI-RADS first

    A dedicated thyroid ultrasound scored using TI-RADS decides which nodules ever need a biopsy.

  • Surgery is risk-adapted

    Hemithyroidectomy is often enough for small, low-risk cancers — total thyroidectomy is not automatic.

  • Subtype drives treatment

    Papillary, follicular, medullary and anaplastic thyroid cancers follow very different pathways.

How the diagnosis is made

From nodule to a clear plan.

The ultrasound-and-cytology pathway UK endocrine and oncology teams now follow, in order — so you know what to expect and why.

  1. 01

    Assessing

    Thyroid nodule assessment

    A neck examination and history — most nodules are found incidentally and the majority are benign.

  2. 02

    Assessing

    Ultrasound + TI-RADS

    A dedicated thyroid ultrasound scored using TI-RADS decides which nodules need sampling.

  3. 03

    Assessing

    Fine-needle aspiration

    Ultrasound-guided FNA cytology, reported using the Bethesda system, categorises the risk of malignancy.

  4. 04

    Confirming

    TSH + calcitonin

    Thyroid function tests, with calcitonin measured when medullary thyroid cancer is possible.

  5. 05

    Confirming

    Molecular testing

    In selected indeterminate cytology cases, molecular testing helps distinguish benign from malignant.

  6. 06

    Planning

    Total or hemithyroidectomy

    Surgery is risk-adapted — a hemithyroidectomy for many small cancers, total thyroidectomy for higher-risk disease.

  7. 07

    Planning

    Endocrine + oncology MDT

    A joint endocrine and oncology MDT plans TSH-suppression, radioactive iodine and any further treatment.

Typical timeline: 4–8 weeks from thyroid nodule to a treatment plan.

Symptoms

What thyroid cancer actually shows up as.

Many thyroid cancers are found incidentally on scans done for another reason. When symptoms do appear, they matter — here is what to watch for and when to act.

  • Thyroid nodule

    A lump in the thyroid, often found on scanning done for another reason — most are benign.

  • Neck lump

    A firm, painless lump at the front of the neck that moves on swallowing warrants an ultrasound.

  • Hoarseness

    A persistent hoarse voice with a thyroid mass can indicate recurrent laryngeal nerve involvement.

  • Dysphagia

    Difficulty swallowing solids, or a feeling of pressure in the throat with a thyroid lump.

  • Chronic cough

    A persistent cough with no chest cause — with a thyroid lump — deserves imaging.

  • Medullary features

    A family history of MEN2, phaeochromocytoma, or a raised calcitonin points to medullary thyroid cancer.

  • Anaplastic mass

    A rapidly enlarging neck mass in an older patient — anaplastic thyroid cancer is a medical emergency.

  • Red flag

    Rapidly enlarging neck mass with stridor or airway compression — same-day ENT assessment.

Treatment

How thyroid cancer is treated in the UK.

Treatment is risk-adapted and subtype-specific — from active surveillance for very small papillary cancers, to surgery, RAI and modern targeted therapy for advanced disease.

  • Active surveillance

    For very small, low-risk papillary microcarcinomas — regular ultrasound rather than immediate surgery.

  • Hemithyroidectomy

    Removal of one thyroid lobe — often enough for small, low-risk differentiated cancers.

  • Total thyroidectomy

    Removal of the whole thyroid — for larger or higher-risk differentiated and medullary cancers.

  • Central + lateral neck dissection

    Removal of lymph nodes in the neck when there is proven or high-risk nodal involvement.

  • Radioactive iodine (RAI)

    A capsule or drink of iodine-131 taken up by thyroid tissue — used in selected differentiated cancers.

  • TSH-suppression levothyroxine

    Long-term thyroid hormone replacement dosed to suppress TSH, reducing recurrence risk.

  • Selpercatinib / pralsetinib

    Highly targeted RET inhibitors for RET-altered medullary and RET-fusion thyroid cancers.

  • Dabrafenib + trametinib

    A BRAF/MEK inhibitor combination transforming outcomes in BRAF-mutated anaplastic thyroid cancer.

What this guide is based on

The sources behind every number on this page.

UK and European guidance, specialist society standards and patient-organisation resources, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or endocrine and oncology team knows your history and can tell you which parts apply to you.

  • British Thyroid Association. Guidelines for the management of thyroid cancer.

  • National Institute for Health and Care Excellence (NICE). Thyroid cancer guidance.

  • European Thyroid Association. Clinical practice guidelines on thyroid cancer.

  • Thyroid Cancer Alliance. Patient information and support resources.

Red flags

When thyroid cancer becomes an emergency.

Most differentiated thyroid cancers are slow-moving. These are the situations where they stop being slow — and you should act today.

  • Airway compression

    A rapidly growing neck mass with stridor, breathlessness or difficulty swallowing — call 999 or attend A&E.

  • Anaplastic thyroid cancer

    A fast-enlarging hard neck mass in an older patient needs same-day specialist assessment.

  • Recurrent laryngeal nerve palsy

    New hoarseness after thyroid surgery, or with a thyroid mass, needs urgent ENT review.

  • Post-thyroidectomy hypocalcaemia

    Tingling around the mouth or in the hands after thyroid surgery — needs urgent calcium check.

  • Post-RAI xerostomia

    Persistent dry mouth or salivary swelling after radioactive iodine — flag to your team.

  • MEN2 cascade screening

    Medullary thyroid cancer should trigger RET genetic testing and screening of first-degree relatives.

  • Metastatic bone pain

    New persistent bone pain in known thyroid cancer warrants imaging to exclude spread.

  • Post-op haematoma

    A tense, expanding neck swelling after thyroid surgery is an airway emergency — call 999.

  • Pregnancy considerations

    Thyroid cancer in pregnancy needs careful joint endocrine, oncology and obstetric planning.

Living with it

A long-term journey, with structured support.

Four things that make the biggest difference day to day — monitoring, side effects, hormone replacement and specialist follow-up.

A quiet reminder

Ask about your TSH target.

After thyroidectomy, the right TSH-suppression target depends on your risk group — ask your endocrinologist what yours is and why.

  1. 01 Monitoring

    Thyroglobulin is your marker

    After total thyroidectomy, thyroglobulin trends and ultrasound track for recurrence over the long term.

  2. 02 Side effects

    Voice and calcium

    Post-operative voice change and low calcium usually settle — but should be reviewed early if they persist.

  3. 03 Hormones

    Levothyroxine for life

    After total thyroidectomy, daily levothyroxine is essential and the dose is tuned to your TSH target.

  4. 04 Reviews

    Structured follow-up

    Regular endocrine follow-up with thyroglobulin, TSH and ultrasound keeps recurrence detected early.

Frequently asked

Everything we get asked about thyroid cancer.

Quick answers on nodules, ultrasound, FNA, active surveillance, RAI and when to worry.

  • What is thyroid cancer?

    A cancer arising from the thyroid gland. There are four main types — papillary (about 85%), follicular (about 10%), medullary (about 4%) and anaplastic (about 1%) — and they behave very differently.

  • Do all thyroid nodules need a biopsy?

    No. Most thyroid nodules are benign. A dedicated ultrasound scored using TI-RADS decides which nodules need fine-needle aspiration cytology.

  • What is active surveillance for thyroid cancer?

    For very small (usually under 1 cm), low-risk papillary microcarcinomas, careful monitoring with ultrasound is a safe alternative to immediate surgery in selected patients.

  • What is radioactive iodine treatment?

    RAI is a capsule or drink of iodine-131 taken up by any remaining thyroid tissue. It is used in selected differentiated thyroid cancers after total thyroidectomy to treat residual and microscopic disease.

  • Why is medullary thyroid cancer different?

    Medullary thyroid cancer arises from a different cell type and does not take up iodine. It needs calcitonin monitoring, RET genetic testing and MEN2 cascade screening of first-degree relatives.

  • When should I worry about symptoms?

    A rapidly enlarging neck mass, new hoarseness, difficulty swallowing or breathing with a thyroid lump — arrange same-day ENT assessment. Stridor or airway compromise — call 999.

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