Keep on top of your TSH level. Do you know what it was before you had radiation? Also, you are not supposed to take calcium, iron and I think zinc until 4 hours after the synthoid, or the synthroid has a lesser effect. I get my TSH level checked every 3 months and more often when it goes off my normal 2.5. I can usually tell because I either start eating everything in sight (too low) or I start falling asleep while driving (too high). Out of whack thyroid as a zillion different side effects.

Take care,
Eileen

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Aug 1997 unknown primary, Stage III
mets to 1 lymph node in neck; rt ND, 36 XRT rad
Aug 2001 tiny tumor on larynx, Stage I total laryngectomy; left ND
June 5, 2010 dx early stage breast cancer
June 9, 2011 SCC 1.5 cm hypo pharynx, 70% P-16 positive, no mets, Stage I