Ok. I am 5 months post left hemi-thyroidectomy and I am still having some cardiac issues. It's not as bad as is had been prior to the surgery, but still a nuisance and enough to make me cautious. I was wondering if anyone experienced cardiac occurrences after removal of their thyroid? Some days I feel like I my heart is going to beat out of my chest and other I feel like I could run a marathon. I have had a nuclear stress test, treadmill test, ekg, echo, 24 monitoring, x-ray and all seems to be normal. No blocked arteries and doc says cholesterol is amazingly perfect with my HDL above 85 and my LDL below 100. I am wondering if this is high blood pressure causing all of my grief. What do you think?