HomeAnswersCardiologyarrhythmiasI have hypothyroidism and my heart rate fluctuates. Why?

Does hypothyroidism cause fluctuating heart rate?

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The following is an actual conversation between an iCliniq user and a doctor that has been reviewed and published as a Premium Q&A.

Medically reviewed by

Dr. K. Shobana

Published At February 10, 2023
Reviewed AtDecember 6, 2023

Patient's Query

Hi doctor,

I am a moderately fit female (running 6.21 to 9.32 miles). My height is 5' 6" and weight is 149 pounds. I have hypothyroidism, and I am on Levothyroxine. My TSH is around 1.5 mIU/L. My question is about a fluctuating resting heart rate. According to my sports watch, my RHR can be between 80 and 41 bpm. It is the lowest two or three days after a run where I have struggled to keep my heart rate below 150 bpm, even while running slower than a walking pace. Is this something to be concerned about, or is it just a weird glitch? Thank you.

Hi,

Welcome to icliniq.com.

You have chronotropic incompetence (an inability to increase heart rate with exercise). This could be a consequence of hypothyroidism. However, I understand that it remains persistently high, possibly due to autonomic disturbances. My advice is to keep exercising at a low-intensity level so that your autonomic nervous system becomes accustomed to it and slowly increases the intensity later.Thank you.

Same symptoms don't mean you have the same problem. Consult a doctor now!

Dr. Vivek S Narayan Pillai
Dr. Vivek S Narayan Pillai

Cardiology

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