Is it dangerous to have a 0.005 TSH value?

[crm13]

My TSH was 0.019 a month ago and now is 0.005 even though I have been taking 60mg x day of Methimazole. Is it dangerous to have such a low TSH value?

I have been taking also Propanolol to lower my pulse because I was having tachycardia.
My symptoms are: extreme sweating especially when I wake up, fatigue, muscle weakness (arms and legs), dizziness, nausea, blurred vision (sometimes double vision), edema in my feet.

Current values /  month ago values / normal range
T4 Thyroxine 12.6 / 21.3  (4.8 - 13.9)
Total T3  187 / 296  (60-181)
Free T3  5.7  / 9.2   (2.2 - 4.0)
Free T4  1.80 / 3.18  (0.76 - 1.46)
TSH  0.005 / 0.019  (0.358-4.700)

My TPO a month ago was extremely elevated (6500) but endocrinologist didn't give me any medication for it. It has been elevated for the past 2 years but never this high (values were between 1000 and 3000 before).

I am a woman in my early 40's and have been having thyroid changes (ups and downs) for the last 8 years.

I am scheduled for a MRI of the brain with contrast next Monday to follow up on a meningioma but I'm worried the contrast will make my thyroid condition worse. Should I cancel the MRI?

I will appreciate your comments. Thanks!

[crm13]

Thanks for your post. My doctor called me today and told me to continue with the same dosage of Methimazole and propanolol since they did their job. I am not suffering that much with side effects now but the first week I was taking these drugs I felt like my head was spinning all the time. He said that I am improving compared to last month. He told me the most important thing is the Free T4 and that is getting closer to normal range. I heard terrible things from people who removed their thyroid. I will try to keep mine until the end.
Good luck with your medication, hope you get better with the Synthroid.

[Dobielover]

Sounds like you are where I was back in March of this year with Graves disease.  Went thru hell with the same symptoms.  Give the methimazole time to work although it sounds like you may need to have it increased..   I was on it for two months while my levels came down and then she loved the dose to 10 mg 3x a day and then within two weeks I felt pretty good.  When my free T4 came back to almost normal and the TSH was still low, she was not concerned as she said it takes time for the TSH to come back up.  Was even able to reduce the metoprolol as I hated the side effects of that drug.  But I opted to have the thyroid removed because I was concerned about the side effects of the methimazole long term and when I met with the surgeon I was just so miserable...that was before the methimazole really took effect..  I think it was a mistake to have the thyroid removed as being on the Synthroid is a killer for me.. Your doc may think the methimazole is working since your levels did come down and just wants to give it another month.

[crm13]

Thanks for your explanation. It was really good advise!

[Barb135]

TSH isn't what you need to be worried about.  It neither causes nor alleviates symptoms; it's merely a messenger hormone that's trying to get your thyroid to stop producing hormones.

Free T3 and Free T4 are what you need to be looking at and both yours are too high, since they are both over the upper limit of the range.

There is no medication to lower antibody counts.  The raw number doesn't matter; simply the fact that they are present indicates that you have Hashimoto's and are in a hyper phase.  It looks like you need to increase your methemazole to bring your FT3 and FT4 levels down - those are what can be dangerous, not the low TSH.