Since I started T3/T4 combination therapy last summer I have been tracking my BP, heart rate and body temperature (orally). I am currently on T3 only and my body temperature fluctuates massively. For example yesterday;
0725: 35.5
0816: 35.4
0927: 35.5
1041: 35.3
1508: 35.3
1602: 35.8
1831: 35.9
1921: 36.7
2200: 36.2
The last week has seen my temperature dip into the high 34's.
use a Geratherm digital. It tends to read about 0.2 degrees lower than the Geratherm mercury gauge. I always try to avoid taking my temp after food, exercise and a shower.
I take my heart rate and blood pressure at the same time. It's hard to say if there is any relationship between temps and other signs. Generally speaking the higher the temp, the higher the blood pressure. For Example today at 1433 my temp was 36.1 and my blood pressure was 142/85, up from my 1st reading of the day at 0731: 35.7 degrees C and BP of 135/80.
Any thoughts on this would be most welcome. Many thanks in advance.
Written by
joey82
To view profiles and participate in discussions please or .
My temps are similar, usual waking morning temp is 35.81. This has been the case whatever t3 only dose I've ever been. I blame low body temps for not being able to lose weight normally and thought by exercising that would increase them but no, still miserable low reading. My endo does not take me on at all when I mention them 🤨Don't think I will ever achieve normal temps and do believe it has some significance in never alleviating my symptoms
Adrenal fatigue causes temperature fluctuations, more so than hypo when you are just cold all the time
You might find these website enlightening, the importance of cortisol to get the fT3 into the cells is worth looking into, low temperature ties in with adrenal fatigue and low cortisol
Thank you Tigger, I'll read these now. I definitely have some symptoms of adrenal fatigue/low cortisol.
Sometimes my temp goes well into the 36's, so for me that's always been a sign that there is T3 in the blood stream and being delivered into the cells, but not working effectively with cortisol.
Taking your T3 dose when your cortisol levels are good can be worth a try or some like the CT3M regime where you take your T3 in the early hours to hopefully tie in with early morning cortisol and some find is helps increase cortisol
I've been doing CT3M since before Christmas. Slowly working towards 0300hrs and increasing the dosage every 7 days. It never produced anything near like a good result in either signs or symptoms upon waking and I think it limited my T3 day time doses as my BP got way to high.
I then done a cortisol saliva test and Paul Robinson advised me to bring the dose down to 5am and then start reducing it. That was over 2 weeks ago and since then it's been a nightmare. I've been quite unwell. I'm currently at 25mcg at 0500.
I just want to get off CT3M as it's caused a lot of confusion for me, my knowledge doesn't extend far enough that I can work out whats going on. If I get to daytime T3 doses and then I can re-test and reassess the situation.
I had low morning cortisol on Levothyroxine. Thats why I had decided to try CT3M. bad move in hindsight I think.
I still take all my T3 & 4 sometime between 3-6am but it hasn't made any difference to my cortisol levels, I've also tried splitting my T3 dose but it doesn't work for me
Your systolic/diastolic ratio is above 1.5 (120/80 is normal, equal to 1.5) and this suggests to me that perhaps you have systolic hypertension, something that elevated cortisol tends to produce. Body temperature instability appears to be the work of the adrenal glands. Body temperature in general would be partly the thyroid gland's responsibility via trickle down from the hypothalamus → pituitary → thyroid stimulation.
The takeaway with Dr. Rind is that you'll have a steady (but low) body temperature when your thyroid function is low, and a very unstable body temperature when your adrenal gland is not functioning properly, and (in my opinion) is probably attempting to control temperature homeostasis when the thyroid gland is unable to do its part.
This has been my personal experience...wildly unstable (and lower than normal) body temp. Thyroid hormone therapy now at 100/25 (T4/T3) with more stable (but still lower than normal) body temp.
Content on HealthUnlocked does not replace the relationship between you and doctors or other healthcare professionals nor the advice you receive from them.
Never delay seeking advice or dialling emergency services because of something that you have read on HealthUnlocked.
Fluctuating body temperatures
Body temperature
Very low body temperature?
Low Body Temperature 
Low body temperature and being too hot
