I have had my thyroid removed in april this year due to thyroid cancer, then had in-patient radioactive iodine treatment end July 2010- been given the all clear-end august. Have been on 150mcg thyroxine daily, did NOT get a period between the radioactive treatment end of July-3rd november when Gp increased my thyroxine 150mcg/200mcg alternate days due to blood test results. 14 days after the period in beg nov, I started bleeding again, i am worried about this in-between cycle bleed.