What is thyroid cancer?

Thyroid cancer happens when cancer cells form from the tissues of the thyroid gland.

Most people with thyroid cancer have a thyroid nodule that does not cause any symptoms. If you do have symptoms, you may have swelling or a lump in your neck. The lump may cause problems swallowing. Some people get a hoarse voice.

To tell if the lump or nodule is cancerous, your doctor will order certain tests. Most thyroid nodules are not cancerous.

For more information about thyroid cancer, visit the National Cancer Institute's thyroid cancer page.