I have a question about this topic. I am a woman and have a large lump in my throat which was determined to be my swollen thyroid. They tested it for cancer and it was not cancerous. They told me that with my symptoms (loss of weight I'm 5'6" and only weigh 111 lbs., trembling, panic disorder, excessive sweating all of the time) and the swollen thyroid that it was most likely hyperthyroidism. This was a big relief to me because they were telling me that it was a medical problem and that I could get treatment and not have my panic disorder. Well I did the radioactive iodine test and the results came back that it was fine and showed no signs of hyperthyroidism. They then drained the lump with needles when they tested for cancer. Well the lump came back pretty quickly and this was about 2 years ago and it's still there. The hospital where I got the iodine test is known for being somewhat incompetent. So my question is that if my thyroid is swollen and the lump came back even after being drained, and I still have so many of the symptoms of hyperthyroidism, could the doctor at the hospital be mistaken about the results of the iodine test? Could I really have hyperthyroidism?