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Dr. SH
Dr. SH, Board Certified Physician
Category: Medical
Satisfied Customers: 8781
Experience:  Doctor of Medicine
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I had a full thyroidectomy in 2003 and have been stable on

Resolved Question:

I had a full thyroidectomy in 2003 and have been stable on a T4 dose of 150mcg daily. In the past four months I've increased my training to half-marathon distance and find I'm totally wiped out after a run of 10miles plus. For the past 3 weeks I've had numbness in my hands and feel increasingly tired, not thinking clearly, slower than normal reactions etc. My blood test last week showed undetectable TSH and T4 of 4.4 and so my GP has reduced my T4 to 125mcg. Is this correct as I'm really struggling to maintain my weight now after working really hard to lose 1.5 stone over the last year and had assumed I was more hypothyroid ?? I'd be grateful for some advice, many thanks
Submitted: 3 years ago.
Category: Medical
Expert:  Dr. SH replied 3 years ago.

Dr. Shahzad MD :

Hi there. Thank you for your question. I will be helping you out with your queries

Customer:

Thank you

Dr. Shahzad MD :

welcome

Dr. Shahzad MD :

Do you have increased heart rate or palpitations or sweating?

Dr. Shahzad MD :

or heat intolerance?

Customer:

I don't think so to heart rate, though I do feel a bit more breathless than normal. Yes to increased sweating over the past few days only though

Customer:

I'm definitely feeling colder too

Dr. Shahzad MD :

The TSH being undetectable does mean that you are on a higher than normal dose.

Dr. Shahzad MD :

Which is why the dose of thyroxine has been reduced.

Dr. Shahzad MD :

The reasons as to why this happened is difficult to say

Dr. Shahzad MD :

But to be sure, I would have liked to have repeated to test at least once more to be dead sure.

Customer:

O.k, how about the T4 being lower than normal range? Is this consistent?

Dr. Shahzad MD :

That is not consistent but TSH is more accurate and that is what we rely on for changing the dose.

Dr. Shahzad MD :

T4 can be something misleading.

Customer:

Does intense exercise require more thyroxine?

Customer:

I'm just really scared by how I feel right now, sorry.

Dr. Shahzad MD :

Yes it may require more thyroxine I agree but your thyroxine requirement has reduced.

Dr. Shahzad MD :

So I am not really sure why this has happened.

Dr. Shahzad MD :

It may be that there is some residual thyroid tissue that has become active.

Customer:

Would T3 help me have more energy?

Dr. Shahzad MD :

Well, T3 is the active form. The effects vary from individual to individual.

Dr. Shahzad MD :

So it may be better for you but usually there is no difference in the two in terms of 'energy'.

Customer:

O.k, I take it it's safe to try?

Dr. Shahzad MD :

I would do that in consultation with your doctor who is treating you currently.

Dr. Shahzad MD :

I would not advise you to do it on your own.

Customer:

I'm pretty desperate, as I'm working really hard to lose weight and get fitter

Customer:

O.k thank you

Dr. Shahzad MD :

You are most welcome
Take care
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