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Viewer spots thyroid cancer symptom on HGTV host

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A viewer helped save the life of HGTV host Tarek El Moussa, who had a suspicious lump on his throat that turned out to be thyroid cancer. Moussa is in remission, and now urges others to learn the symptoms of the disease. NBC News medical contributor Dr. Natalie Azar answers some of the biggest questions about thyroid cancer and how to spot it.