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Macmillan and Cancerbackup merged in 2008. Together we provide free, high quality information for people affected by cancer through our publications, website and phone service. Find out more|.
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In most people, thyroid cancer develops very slowly. The first sign is usually a painless lump in the neck, which gradually gets bigger.
Occasionally, a thyroid tumour may press on the gullet (oesophagus) or windpipe (trachea) and cause difficulty in swallowing or breathing.
Very rarely, the first symptoms may be caused by secondary tumours in the bones| or lungs| after the cancer has spread beyond the thyroid.
It is unusual for cancer of the thyroid to affect the production of thyroid hormones, so symptoms of an over- or under-active thyroid are uncommon.
If you notice a lump in your neck, or any of the above symptoms, you should see your doctor as soon as possible. However, most thyroid swellings (or goitres) are benign (not cancerous).
For answers, support or just a chat, call the Macmillan Support Line free (Monday to Friday, 9am-8pm)
If you have any questions about cancer, need support or just want someone to talk to, ask Macmillan.