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Thyroid cancer, heart problems & finding right thyroid med dose
Thyroid Cancer | Last Active: Jul 28 8:02am | Replies (7)Comment receiving replies
Hi, Amaliaspyr,
I am sorry you are going through all of this and I hope you can get it figured out and get to feeling better, really soon.
I have experienced tachycardia (over 200bpm on average), palpitations and irregular beats, since my recent total thyroidectomy in May (2026). But, I am a bit different because I was born with Supra Ventricular Tachycardia (SVT), which causes high heart rate and what feels like palpitations, so I already have a cardiologist. I had never taken medication for the high heart rate, prior to my thyroidectomy, because the times when my heart rate would get over 200bpm, I could get it back down within a few minutes by using a vasovagal maneuver. However, after my thyroidectomy and getting on levothyroxine 100mcg, it started happening approximately 15 + times a day and I could not easily get it back down with the vasovagal maneuver. I was miserable and exhausted because of it. I had a feeling it was the medication, so I contacted my surgeon and asked if he thought it could be the medication. He lowered my dose of levothyroxine to 88mcg, to see if the symptoms would improve. After, a couple of days, my heart rate was much more normal but would still get really high, a 3-5 times a day. That's better than it happening 15 times a day, but it was still quite bothersome. So, I contacted my cardiologist and he suggested that I begin taking Flecanide 50mg, daily, up to 2 times per day. I have only had to take it once a day and it has helped tremendously. Now, my heart rate only gets up on occasion but it does not last very long. So, I believe the Flecanide is doing its job. Hoping your appt. with the cardiologist was beneficial and you soon can at least get rid of the heart issues.
I don't know if this helps, but I wanted to share what worked for me in hopes that it may help you.
God bless and I will be praying for you.
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@anniefannie22 Hi Annie,
Thank you so much for your reply. It was incredibly helpful, and I truly appreciate you taking the time to share your experience with me.
I'm also really happy that I finally found someone who has symptoms so similar to mine. It honestly makes me feel less alone. I'm very sorry to hear about everything you've been through with your health as well, and I sincerely hope you're doing well and continuing to feel better.
After my appointment with the cardiologist, he told me that my resting heart rate was 112 bpm. So whenever I was moving around, it was definitely going up to around 130–140 bpm or even higher. He diagnosed me with tachycardia and told me that I needed to start treatment.
It's been less than a week since I started taking Emconcor 2.5 mg—one tablet in the morning and one in the evening. Thankfully, my heart rate has already dropped quite a bit. It's now usually between 60 and 70 bpm, and the highest I've seen is around 80 bpm. I finally feel like I can do simple things again, like going for a walk or even taking a shower by myself. It's definitely been a huge relief.
Of course, I still feel a little strange sometimes because I had gotten so used to having such a high heart rate, and now it has suddenly become much lower. But overall, I already feel much better than I did before, and I really hope things continue to improve from here.
Thank you so much for all your advice, your kindness, and especially for keeping me in your prayers. It truly means a lot to me.
Also, if you'd be interested, I'd love for us to exchange social media so we can stay in touch more easily and continue sharing our experiences. It would make me very happy.
Thank you again for everything. Wishing you all the best, and I hope you continue to recover and stay healthy.