When someone gets emotional, it’s said that they have a lump in their throat. While that kind of lump is harmless, you may have a reason for concern if you actually see or feel a lump. The symptoms of something more serious are not always obvious. They can mimic other diseases. But if you have a lingering sore throat, a sinus infection that won’t go away, neck pain, voice changes, breathing difficulties, coughing or trouble swallowing, all of these symptoms can be indicators of thyroid cancer.