<s>[INST] Hi last week i found a rbbery firm lump about 2/12 by 1 it feels like it comes over from bottom of throat onto center of chest it is not sore..saw dr on friday he said it should not be there..its not to my thyroid as i am hypo..on levy with symptoms of exaustion weakness dizzy..cold..hair loss..but started to get headaches cant lie on my back my heart goes deep thumping..i get the odd pain in my throat.feeling of pressure in upper chest.cough and breathing probs..dr felt it and said i will arrange scan..and specialist..its not thyroid but i will speak to to other drs here to see what specialist they recomend for this..maybe the one for thyroid as well as it is connected to his field..?? What do you think it is.. [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have either some thyroid lesion or some mediastinal mass like Thomas or germ cell tumor, or it may be some soft tissue tumor. You should go for ct scan of chest and neck. It will give exact idea regarding location and origin. Then if needed to go for fine needle aspiration cytology. Then you should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>