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I potentially have an underactive thyroid (TSH 4.5 [0.4-4], free T4 11.8 [9-21]). I have a lot of symptoms but the NHS don't recommend treating until TSH reaches 10. I'm scheduled for a recheck in 6weeks or so.
I'm planning on a lot of long distance runs at the weekends to try and build endurance, as this has been a weak area for me with my running. I read elsewhere in the forum that intense training can skew your blood results, causing a lower TSH. If I do my runs at a low HR (I'm trying the Hadd approach) would this still potentially interfere with results?
I'm so tired - I'm sure I'm hypothyroid and I want the doc to listen!! I also feel the need to run long distances because I'm so frightened of putting on more weight. I'm carrying about 10lbs more than I need to just now and finding it so difficult to lose them.
Does anyone have any experience of how training can affect blood results? I find the internet awash with information about low thyroid but not much specifically for runners.
Thanks in advance