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London: A sore throat and swollen glands might be symptoms of a cold or fever, but they can also be symptoms of deadly cancer. According to England's National Health Service (NHS), these symptoms can also be a sign of rare but dangerous thyroid cancer that affects the thyroid gland, a small gland at the base of the neck that produces hormones, reporst Daily Express. Though it is easily treatable and in many cases, it gets cured completely, but it can sometimes return after treatment.