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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Fast Heart Rate And Anxiety While Treating Thyroid Disorder?

Hi...I m a 65 year old female. When I was 50 I was diagnosed with Graves Disease...had RAI treatment then 3 months later was put on Synthroid. I felt horrible on Synthroid and was put on compounded natural desiccated thyroid. I felt better within days. My TSH has been .45 and .50 the last two times I had blood work done. It this where it should be? My doctor is fine with it....I think I feel great, but little symptoms have been popping up like fast heart rate, anxious/jittery feelings at times. Should I worry? Thanks!
Tue, 13 Dec 2016
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Internal Medicine Specialist 's  Response
Your TSH is on the low side of normal (depending on your laboratory standard values). This means that your dose of Synthroid is correct.

However, the symptoms you are describing are symptoms of hyperthyroidism. Since your TSH is borderline low (which goes along with hyperthyroidism), I would recommend discussing your symptoms with your doctor. You likely have room to decrease your dose of Synthroid which will likely help your symptoms.
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What Causes Fast Heart Rate And Anxiety While Treating Thyroid Disorder?

Your TSH is on the low side of normal (depending on your laboratory standard values). This means that your dose of Synthroid is correct. However, the symptoms you are describing are symptoms of hyperthyroidism. Since your TSH is borderline low (which goes along with hyperthyroidism), I would recommend discussing your symptoms with your doctor. You likely have room to decrease your dose of Synthroid which will likely help your symptoms.