Hi, I’m new here, recently diagnosed, and just found this thread while searching for hyperthyroidism and running. I am glad I found this information as I had no idea running could cause a deadly arrhythmia. I was determined to run anyways until now. What a bummer. I ran my first marathon on May 3, and then ran a half on May 17. Shortly after that I began to notice things just weren’t right with my body. At first, I blamed my slowing times on the heat. My RHR was still right around 50, so I didn’t think it was due to overtraining. Then around the second week of June I started not to be able to make it through my long runs. Pretty soon I was walking up hills. Running intervals had my HR higher than I thought my max was. I train with a HR monitor and wore it around the house one day and noticed my HR went from 55 to 90 just from standing up. Went to my PCP for help. Several years ago I’d been told I had Hashimoto’s (goiter and elevated TG) but had remained euthyroid on yearly tests, so I was very surprised when my TSH was .005 and he told me I was hyper (and not hypo like I have been waiting for). I had an uptake done and it was also high. Now I’m waiting for an ultrasound since my scan looked like one lobe was longer and they want to check and make sure there isn’t a cold nodule on the end of the shorter lobe. Anyways, I’m pretty depressed not being able to run. I’d just started 18 wk marathon training for October when this happened. But at least it looks like there’s hope. I have an endo appt one week from today and had hoped it’d be a fast fix and I’d be running in the 4th of July race I’d planned, but I guess that’s not gonna happen.
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