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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Heart Palpitations While On Synthroid?

I have been diagnosed with hypothyroidism for over 14 years. I have been on synthroid until 16 months ago and a new dr changed me to naturethroid. At first I had to take both the synthroid and nature throid ( couple months) together because of fluttering of heart at first taking NT. I felt great taking both. Recently I started having palpations after over a year on just NT. Blood levels show normal T3 and T4 but high TSH of 14. I had never had palpations so bad before. They would wake me up at 2-3am these past few weeks. My question is can Some people take both synthroid and naturethroid daily together as a normal medicine regime or do i have to completely change to one or the other. How long will my palpations last if Doctors have increased my dosage...when will they subside??? I just read that NT causes more palpations because of its target on T3.
Fri, 16 Nov 2018
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General Surgeon,  's  Response
Hello,

It may be due to hyperthyroidism.

Do a TFT (thyroid function test) to check whether your thyroid hormones within normal limits or not.

If symptoms persist better to consult a cardiologist and plan for a serial ECG.

Hope I have answered your query. Let me know if I can assist you further.

Regards,
Dr. Shinas Hussain,
General & Family Physician
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What Causes Heart Palpitations While On Synthroid?

Hello, It may be due to hyperthyroidism. Do a TFT (thyroid function test) to check whether your thyroid hormones within normal limits or not. If symptoms persist better to consult a cardiologist and plan for a serial ECG. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Shinas Hussain, General & Family Physician