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Thyroid UK
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T3 / hypothyroidism and exercise

Hi all

I've got Hashi hypothyroidism on 150mg of levothyroxin. I really like to exercise and do a lot of HIIT, running, cycling, gym classes etc. The problem I'm finding is that I'm very tired and also I get sick quite regularly. Does anyone here have any tips if you like to exercise and want to continue and not lose too much energy. Food/ vitamins/ and advice?



4 Replies

I think the first priority is to get your thyroid hormones to an optimum. It has probably taken years for hormones to gradually reduce and we get diagnosed, so it will take a while to gradually build up to an optimum.

You will have to be patient as there's no quick-fix. Thyroid hormones (levothyroxine converts to T3) particularly T3 which is the only active thyroid hormone and it is needed in our billions of receptor cells - I suppose you could look upon T3 as the 'energy' for the cells and just like a battery for your radio it wont function properly if running out of power. When we exercise before on optimum it reduces the T3 in our cells and we don't feel so good.

You can do less strenuous exercises in the meantime till you can exercise with no ill-effects.

I have looked at a previous post and you became hypo after having your baby and that happens frequently unfortunately.

Also make sure everything is optimum. T4, T3, Free T4 and free T3 and I don't know if you have antibodies - if you have them going gluten-free can help reduce them. B12, Vit D, iron, ferritin and folate also have to be optimum.

I am sorry you are getting frustrated at present.

1 like

When was last full thyroid and vitamin blood test. Essential to test thyroid antibodies, vitamin D, folate, ferritin and B12. Always get actual results and ranges

All thyroid tests should be done as early as possible in morning and fasting and if taking Levo don't take it in the 24 hours prior to test, delay and take straight after.

If you are taking vitamin B complex, or any supplements containing biotin, remember to stop these 3-5 days before any blood tests, as biotin can falsely affect test results



Always take Levo on empty stomach and then nothing apart from water for at least an hour after. Many take on waking, but it may be more convenient and possibly more effective taken at bedtime


Many people find Levothyroxine brands are not interchangeable. Once you find a brand that suits you, best to make sure to only get that one at each prescription.


Hi SlowDragon thanks for your advice. If you click on my profile I've listed my test results I got this week. I have high antibodies and also low levels of vitamins. Should I get any other tests done? When you mention gluten intolerances. Will this show up in normal gluten tests? Thanks


Your results are not on profile. It often takes several goes to update profile (some computer glitch). Make sure to scroll right down and save bottom right

If you write it up somewhere else and copy and paste it, if it gets lost again it won't be too exasperating

No gluten intolerance doesn't currently have any test via NHS

It's also to do with molecular mimicry too as well as actual intolerance. (See Amy Myers link below)

Changing to a strictly gluten free diet may eventually start to lower antibodies. Very very many of us here find it really helps and is essential to be gluten free





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