Thyroid UK
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Weight loss

Hi all. I've v even on 100mcg Levothyroxine for about 3 years with great benefit and no problems. However, been experiencing palpitations, fainting, dizziness, joint pains etc, recently, and wondering if the fact that I've lost nearly two stone recently might be affecting my levels?

Anybody out there any ideas...I'm feeling pretty grim with it lately a n d would be a relief if it only meant a reduction in my meds.


6 Replies

You need some blood tests in case you are on to much Levo, weight loss can indicate over replacement.


Palpitations can be linked to low iron - also Ferritin - Folate - B12 - VitD. Low levels may also explain your joint pains.....

Do you know if you are converting well - from the T4 into the Active T3 ? You really need a FT3 result to see what is really going on.....


OK guys, before I get any more advice...just to say the weight loss was intentional, I've had every blood test known to man recently after two spells in A&E with palpitations and fainting after some viral illness...all normal. I've had ECGs and all the rest of it! I'm a retired nurse, so understand mostly what's going on, just not the miserable palpitations and the feeling dizzy and dreadful for no reason. So I'm not otherwise deficient. Thyroid seemed the next logical thought.


I think you should have a new blood test first before anything else. Ask for a Full Thyroid Blood Test (they may not do it but you can get the ones not done privately).

TSH, T4, T3, FT3, FT4, as well as Vitamin B12, Vit d, Iron, ferritin and folate.

If you usually always use the same levothyroxine, has yours changed recently? Sometimes a change in fillers/binders might affect us.

The blood test should be the earliest possible and fast, you can drink water. Leave about 24 hours between your last dose of levo and the test and take it afterwards.


If you're a retired nurse, you should know that nobody feels Dizzy and dreadful for no reason. There's always a reason. Have you had your nutritional levels tested?


Yes, of course. I've had many relevant blood tests, all normal. GP now back on the case. Thanks.


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