Thyroid Cancer
Thyroid cancer arises from cells in the thyroid gland. It is one of the most treatable cancers when detected early, and most types have an excellent prognosis.
This page gives an overview; specific types are covered on their own pages.
Last medically reviewed: 1 November 2025
Key points
- Thyroid cancer has several types with different behaviour.
- Most differentiated cancers are treated with surgery and sometimes radioactive iodine.
- Medullary cancer needs calcitonin and genetic assessment.
- Long-term follow-up monitors for recurrence.
Types of thyroid cancer
Differentiated thyroid cancers — papillary and follicular — account for the vast majority of cases and generally have very good outcomes. Medullary thyroid cancer arises from parafollicular cells and may be sporadic or inherited. Anaplastic thyroid cancer is rare and aggressive.
Each type has distinct biology, treatment pathways and follow-up requirements.
How is it diagnosed?
Most thyroid cancers are found as a nodule — often incidentally on imaging or noticed as a neck lump. Suspicious ultrasound features prompt fine needle aspiration (FNAC), whose cytology guides diagnosis. Occasionally, lymph node involvement or distant spread is found first.
Once diagnosed, staging may involve neck ultrasound, and for medullary cancer, calcitonin and genetic testing.
Treatment approach
Surgery — lobectomy or total thyroidectomy — is the cornerstone for differentiated thyroid cancer. Radioactive iodine may be used for selected higher-risk cases. Lifelong or long-term levothyroxine and thyroglobulin monitoring form the follow-up backbone.
Medullary cancer requires total thyroidectomy with possible lymph node dissection and calcitonin surveillance. Anaplastic cancer is treated aggressively with surgery, external beam radiation and systemic therapy as appropriate.
Frequently asked questions
Is thyroid cancer deadly?
Most thyroid cancers — particularly papillary and follicular — are highly treatable with excellent long-term survival. Anaplastic thyroid cancer is rare but serious and requires urgent specialist care.
Will I need lifelong medication after thyroid cancer surgery?
After total thyroidectomy, most patients need lifelong levothyroxine. For differentiated cancers, the dose is often deliberately kept slightly higher initially (TSH-suppressive) as part of cancer follow-up.
Can thyroid cancer spread?
Papillary cancer can spread to neck lymph nodes, and rarely to lungs or bone — but this is still often treatable. Medullary cancer has a higher metastatic potential and needs specialised surveillance.
References & further reading
This page is based on established medical knowledge and guidelines from authoritative sources. Always consult a qualified clinician for personal medical advice.
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