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What Causes Irregular Heartbeats While On Synthroid?

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Posted on Tue, 10 Feb 2015
Question: I am a 56 year old woman. I have been taking synthroid (75mcg) for about 4 months. Recently, I started experiencing an irregular heartbeat - random skipping of beats. I had a physical with my cardiologist in October, all is well. This has happened now 7 out of the last 11 days. In the beginning, it was only in the late afternoon/early evening. This past Friday, when it started around lunchtime, I went to my cardiologist, he did a 6 second EKG and all was normal. He sent me home with a portable EKG for 24 hours and I felt nothing. Shortly after returning to the dr's and having it removed, the irregularity started again and has been off and on ever since. This is freaking me out. Could it be related to my thyroid meds?
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Answered by Dr. Noble Zachariah (1 hour later)
Brief Answer:
Excess of thyroid medication can be a cause

Detailed Answer:
Hello,
Welcome to HCM and thanks for your query.
Excess of thyroid medication can produce irregular heart beat and palpitations. Anxiety is another possible cause.
Please check your TSH and FT4 and FT3 values.
Note: For more information on hormonal imbalance symptoms or unmanaged diabetes with other comorbid conditions, get back to us & Consult with an Endocrinologist. Click here to book an appointment.

Above answer was peer-reviewed by : Dr. Chakravarthy Mazumdar
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Answered by
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Dr. Noble Zachariah

Internal Medicine Specialist

Practicing since :1974

Answered : 2319 Questions

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What Causes Irregular Heartbeats While On Synthroid?

Brief Answer: Excess of thyroid medication can be a cause Detailed Answer: Hello, Welcome to HCM and thanks for your query. Excess of thyroid medication can produce irregular heart beat and palpitations. Anxiety is another possible cause. Please check your TSH and FT4 and FT3 values.