I was treated for graves by iodine many years ago. I am on synthroid currently. I have developed a lump on the left side of my adams apple, even with it (not above or below). The lump is solid and i can move it a little bit. My throat is not sore, doesnt hurt when i swallow, doesnt hurt if I touch around it, only if I touch the lump. Then it hurts very much. I developed this same lump about 6 months ago and the doctor dismissed it as stress/job related. It did go away a few days later. Any ideas as to what causes this or what it could be?