I'm a 21 year old male and I've had a 3 cm nodule on the left side of my thyroid for about a year now. I haven't experienced any pain or other side effects, but I decided to ask my GP about it just to be on the safe side. To cut a long story short, I had a needle biopsy, which came back negative, but the ultrasound looked "suspicious" according to the surgeon that I saw. He believes I should have the left half of my thyroid removed, but when I asked him to explain why all he really said is that it has a good, predominantly central blood flow, which is a bad sign. I don't want to have surgery so I just asked what are the chances of it being cancerous and he said 50/50. I have my doubts, and I think he's just being cautious. So I guess what I'm asking is, should I have the surgery or just wait and get another checkup in 6 months or so.