Thyroid Cancer / Nodules & Hyperthyroidism Expert Forum
Low TSH Levels
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Questions in the Thyroid forum are answered by Mark Lupo, MD. Topics covered include Goiter, Graves Disease, Hyperthyroid, Parathyroid/Calcium Problems, Thyroid Cancer, Thyroid Nodules/Cysts, Thyroiditis, Thyroid & Pregnancy, Thyroid Stimulating Hormone (TSH), Thyroid Tests, and Thyroid Surgery.

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Low TSH Levels

I am a 46 years old, and I just had my TSH level drawn and it is 0.374 (the reference for my lab is 0.400 - 4.200 UIU/ML. The two previous results were 0.506 in November of 2011 and 0.8 in November of 2010. Should I be concerned with this consistent drop? The only "symptoms" I have noticed are: constant fatigue; amenorrhea (have missed 2 periods so far); and a much increased appetite (I seem to never get satiated!) which has lead to a small weight gain. I’m confused because I always thought one with a with a hyperthyroid would lose weight, not gain.

Thank you for your insight into this!
97953_tn?1193367871
You're not hyperthyroid.  The TSH in the low normal range, but this is not likely causing any problems.
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Mark Lupo, M.D.Blank
Thyroid & Endocrine Center of Florida
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