What do OPTIMAL body temperatures look like? - Thyroid UK

Thyroid UK

141,198 membersβ€’166,430 posts

What do OPTIMAL body temperatures look like?

ColdBanana profile image
ColdBanana
β€’63 Replies

...In someone who is Healthy, with adequate levels of thyroid hormone, cortisol, nutrients and a good metabolism - throughout the day? For example, i think our temperature first thing in the morning and in the afternoon will always look different, but what numbers are healthy? And should they fluctuate?

I'm just curious because 37.0c is universally accepted as normal ORALLY, but what about first thing in the morning at rest, and at night before bed?thanks

Written by
ColdBanana profile image
ColdBanana
To view profiles and participate in discussions please or .
63 Replies
β€’
Regenallotment profile image
RegenallotmentAmbassador

I can only comment on personal experience, both hubby and I are usually 36.2 on waking. Occasionally I’m 35.9. I’m hypo (close to optimally replaced) he isn’t hypo. 🌱

ColdBanana profile image
ColdBananaβ€’ in reply toRegenallotment

Thanks :)

Out of curiosity, how are both of you taking your temperature?

Regenallotment profile image
RegenallotmentAmbassadorβ€’ in reply toColdBanana

I got one of these new scanner type ones from Amazon didn’t spend a lot, I also have an old fashioned under the tongue glass/mercury one, gives same results (but newbie is less of a faff) so I’m pleased. If I have a sweaty forehead (nightsweats) it shows up colder, the instructions say to try behind your ear and that works 36.2 😊

ColdBanana profile image
ColdBananaβ€’ in reply toRegenallotment

Oh right. I never tried reading my temperature through forehead measurement, but at least it works for you.I use a mercury free glass thermometer. This morning waking I was 36.06c.

Imaaan profile image
Imaaanβ€’ in reply toRegenallotment

Can you pls share the brand of your newer one

Regenallotment profile image
RegenallotmentAmbassadorβ€’ in reply toImaaan

it was this one from Amazon

Non-Contact Infrared Electronic Thermometer Digital Thermometer Accurate and Fast Measurement of Temperature Gun for Children Adult Home Health Care amzn.eu/d/cT8iVmV

Imaaan profile image
Imaaanβ€’ in reply toRegenallotment

Thank you

waveylines profile image
waveylines

Before hypothyroidism & well temp was 36.7C. Untreated sunk to 35.4C. With treatment optimal 36.3C. With vits/ minerals optimal as well as optimal thyroid treatment 36.7C. That temp is constant whether morning or evening.

ColdBanana profile image
ColdBananaβ€’ in reply towaveylines

Interesting - so your temp is 36.7c currently after waking up and you maintain that all day?

waveylines profile image
waveylinesβ€’ in reply toColdBanana

I don't take it all day because obviously depending on how active I am my temperature would fluctuate. πŸ˜‚ But first thing in the morning before rising, last thing at night after a relaxing evening.This surprised me because I'd accepted the lower temp as being the new norm for me. Even going over range on my thyroid meds (not to be recommended) did not bring my temp back up to where it was pre hypothyroidism. But optimising vits minerals did. For me that meant b12 jabs. So listen to people like lovely seaside susie on vits mins!!

sewquilt3 profile image
sewquilt3

I have been monitoring my morning temperature with an in ear electronic thermometer. I’ve been doing this as my dose of thyroxine has been changed. On 50mcg I had morning temps of 35.6, when I went to 75 it was 36.1 and 5 weeks ago I moved to 100 now I regularly get a temperature of 37.2. I have never had that before! Pre-op (hemi thyroidectomy and parathyroidectomy) I always ran low between 35 and 36 . So my normal seems to have changed.

I think it’s useful to know what is normal for you. And to measure at the same time every day.

Yes we all fluctuate, there must be some information out there about the usual highs and lows in a day.

ColdBanana profile image
ColdBananaβ€’ in reply tosewquilt3

Did you check your waking temperature now your dose has been increased again, or is it 37.2 in the morning too?

sewquilt3 profile image
sewquilt3β€’ in reply toColdBanana

yes since the increase to 100 my waking temperature is now at 37.2. It seems to be the main change in symptoms I have noticed on the higher dose.

Noelnoel profile image
Noelnoelβ€’ in reply tosewquilt3

Since that dose increase to 100 and rise in temp to 37.2, what other changes, if any, have you noticed

sewquilt3 profile image
sewquilt3β€’ in reply toNoelnoel

I’m not exactly sure as I had covid for the first time at the beginning of March and it knocked some of the stuffing out of me. Eg energy levels are still low. Mood also low. However , I think my hair and skin is less dry and itchy, I seem to be sleeping a bit longer each night. No less snoring though! Others say my voice is stronger. No change in excess weight..yet still hoping. I gained 10kg after the operation.

Noelnoel profile image
Noelnoelβ€’ in reply tosewquilt3

Since my weight gain I too snore!

waveylines profile image
waveylinesβ€’ in reply tosewquilt3

It's not recommended to check your temp during the day because of the varying levels of activity.... This will cause fluctuations & is normal. The Broda Barnes techniques of temperature first thing is a reliable way of checking your core temperature.

ColdBanana profile image
ColdBananaβ€’ in reply towaveylines

By the way, I test my temps through the day and get accurate results. You have to be at rest for 30 mins before hand though

waveylines profile image
waveylinesβ€’ in reply toColdBanana

That's really interesting Coldbanana. I was just going on what Broda Barnes recommended. 😊These days as I've been stable for a long time so I don't regularly check my temp but it's my go to if I think I've a problem.

TiggerMe profile image
TiggerMeAmbassador

On only T4 36.3 πŸ₯Ά

T3 added 36.6

Ear thermometer

Settled now at 36.7 and after monitoring the dips during the day and adding in adrenal glandular I'm able to keep it at this level throughout now and avoid the crashes.

If your body has what it needs it should regulate at the same temperature all day unless extreme conditions... hot/cold bath etc

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

36.7 sounds like a decent temp to me. What strength adrenal glandular do you use, and how often you dose it?

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

Yeah I'm happy with it, feet more often warm than not!

I did the cortisol saliva test first had started added in Pure Whole Adrenal just one cap and then when I knew my levels were off I started to up the cortex only by adding in Adrenavive II first thing and being guided by temps.

I'm now taking one Adrenavive III first thing and one Adrenavive II & one Pure Whole around noon, never after lunch unless you need to pull an all nighter!

Just waiting for my latest blood test results but I know my fT3 is still below optimal, hoping to support the adrenals whilst raising my T3 again and then gradually tapering them off but using my temperature to guide me to keep everything happy

It has worked well at giving me a more stable energy level... though still low and slow it has eliminated the crashes πŸ˜…

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

So you're taking around 450mg of Adrenal cortex from Adrenavive in the morning, and then a little whole adrenal at noon? That's good advice, thanks - I've heard from a few people now that it isn't good to take it after 12 for the same reason πŸ˜‚If my cortisol comes back low AGAIN when I do have it tested, I am considering trying the Adrenal cortex from adrenavive since people seem to say good things about it.. How did you know when to add thyroid hormone after being on the adrenal for awhile by the way? Because i can imagine it would be hard to know how much of a temp increase to look out for before adding the thyroid. Since, if you got normal temps and results from the adrenal, do you even add thyroid at that point?

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

No..... I take 300mg cortex first thing and then another 230mg cortex + 150mg whole at noon

I was already on T3 and T4 when I started the adrenal glandular which I added at the times my cortisol dropped which was when my temp dipped

I'm currently on 100 T4 and 17.5 T3 ( having just raised the T3 by 2.5mcg 2 days ago)

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

Oh okay thanks!I was thinking about trying 150mg of adrenavive cortex first thing in the morning then another 150 at Noon. I hope i feel it..

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

Good plan, start low and be guided by your temperature, stick with same dose for a week... once it stabilizes you have found your happy dose πŸ€—

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

Thanks! I plan to do JUST that

And to clarify, if the adrenal cortex STOPS βœ‹ my temperatures fluctuating, that would be a good time to add a little thyroid right, even if temps are low still (but stable)?

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

Sounds like you are doing this the right way around by supporting your adrenals first and then adding in thyroid support... most of us had levo forced upon us with very little understanding of quite what we were getting into hence the often continued decline until we are enlightened here.

Yes, I would aim to stabilize your current 'normal' temperature and once this is settled adding in some thyroid glandular should raise your temperature up to the warm zone by increasing your metabolism

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

Thanks! I'm doing this myself. Years ago when i first experimented with NDT my TSH was 3.3(normal range), but based on what I had read my basal temps were quite below normal. And I felt AWFUL πŸ‘Ž

The NDT had no effect on me, even at a dose of 3-4 grains and ELEVATED levels of thyroid hormone. Which lead me to realize blood results are not everything. Because not even my Heart rate increased even a little, on 4 grains. So after trying another ndt with the same results i threw in the towel. This was back in 2020, and I only JUST found out weeks ago how important it is to support the adrenals FIRST.

These days my tsh has gone up to almost 4.2. And feeling more cold β˜ƒ than ever.. So i'm trying again soon with this info in mind.

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

It's an odd one isn't it NDT doesn't work for all... same with the tablets you have to kiss a few frogs 🐸

I'm guessing if you have been doing your homework you already realize the importance of good levels of B Vits, Folate, Vit D and Iron for your body to make best use of things but also cortisol seems to be a make or break on how your body reacts to the interventions, which is my latest learning curve

Edit.... have you heard of the adrenal cocktails too? Mixture of orange juice (Vit C) cream of tartar (potassium) and salt (salt) 😬 all the things your adrenals run on

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

Yes ! I make something similar multiple times a day. I do 1 PINT of orange juice. 1/4 teaspoon sea salt and beef collagen. I have heard of that tartar /oj recipe on this forum before but i have no idea what it is. The salt definitely helps control my apetite a lot. 9g or so a day seems to make me feel a bit better.

Yeah my vitamin D could be better. I am going to start supplementing when my cortisol test is done next week. I have some b complex ill start too :)

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

That's good, it can be overlooking the little things like Vit D etc that can fail all your other great efforts... it is like plate spinning most days! Keeping B's away from C's etc, sublingual's wherever you can makes things easier to manage.

The need for cream of tartar is to keep your salt/ potassium in balance. I stick with a shot glass full of OJ and some buffered Vit C

You have raised the cocktail to a whole new level of 🀒 with the added collagen 🀣 I stick that in my stir fry

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

You should try it :) :)It depends on the BRAND of collagen you have.. Because some have an undertaste, some dont. Mine DOES have an undertaste and for some reason i prefer it with OJ these days more than i do OJ plain 🐻😊

TiggerMe profile image
TiggerMeAmbassadorβ€’ in reply toColdBanana

B's before lunchtime as they can be stimulating, but heck maybe that works for you 🀣

ColdBanana profile image
ColdBananaβ€’ in reply toTiggerMe

I could use the stimulation πŸ˜‚πŸ˜‚ id inject it if i could

waveylines profile image
waveylinesβ€’ in reply toColdBanana

That's interesting..... Sounds like you were experiencing a poor uptake in your cells then. I also had this problem in the earlier days. I naughtily ended up on 5 grains of ndt & still didn't feel great but my blood levels were right up there!! So took an Adrenal support and it helped, was on it for two years then weaned off, used circadian rhythm approach then stopped that. In all honesty I felt heaps better when I went onto b12 jabs, that was the real clincher for me.Usual story it do often about what works for each person.... We are all so different.

ColdBanana profile image
ColdBananaβ€’ in reply towaveylines

Sounds like you were the same as me. But I haven't tried the Adrenal yet. Funnily enough, I looked back and I was also on 5 grains of NDT for awhile and felt nothing at all too. And despite this my blood work showed HYPER. I suppose we know first hand now that a single test cant tell you everything. Sorry if I already asked you this.. But was it adrenal cortex you were taking?

waveylines profile image
waveylinesβ€’ in reply toColdBanana

Fine to ask. 😊 I can't remember what it was.... Dr P recommended it. I know they've stopped making it because a friend told me! I have to say the NDT did definately help me but I just didn't feel well. My recovery plateaued. I also struggled with my weight....which upset me as I was slim before Hypothyroidism came along but I want up four sizes...!! But now I'm GF, B12 in place I've slimmed down but still a size bigger than I was.

ColdBanana profile image
ColdBananaβ€’ in reply towaveylines

Yeah I have had weight issues too. I managed to lose around 10kg a few months ago doing OMAD, but the diet was miserable for me so I just stopped since I had plateaued anyway. I think if your hormones are optimal, and you eat when you're hungry, and avoid junk, your body will probably even its self out. I don't think we have to be perfectly within a range of BMI the NHS says is healthy, because everyone is different like you say

helvella profile image
helvellaAdministrator

The latest Apple Watches incorporate a wrist temperature sensor. The intention is not to measure an absolute temperature accurately - wrist and core temperatures cannot readily be compared. But to show how the body's temperature varies.

A significant part of its reason for existing is to do with ovulation tracking - but that is not relevant to us males!

However, other factors do have their impact. Diet, exercise, alcohol and illness are identified by Apple.

I have been wondering how sensitive it would be to variations in thyroid hormone (e.g. changes to dose whether intentional or due to things like changing product). But I am absolutely NOT going to change dosing in order to find out. I shall look if and when what I am taking changes.

I take my levothyroxine at bed-time. I'll have to think through the impact of that as against taking at any other time.

Despite the comment about variation being the thing, it does allow you to see the actual wrist temperature (34.5 for me, last night) and the interpretation of the data using a complex algorithm (35.78 for me, last night). You can see my variation is quite small and could well be regarded as stable.

They also say variations up to a degree are common.

There could be other devices which do similar things. But I don't know anything of them. And an Apple Watch is a jolly expensive approach if all you want is the temperature! (I re-emphasise, check the specifics before buying one, wrist temperature is a recent addition to some models.)

Screenshot of wrist temperature variation from a recent Apple Watch
Piglet1956 profile image
Piglet1956β€’ in reply tohelvella

Hello Helvella. Does the watch/App tell you the actual temperature (is it 34.5 in your case)? I had been looking at reviews of the series 8 and they seemed to say you never know the actual temperature just the variation once a baseline is established. I felt that was a bit unhelpful and put the idea on the shelf. Thanks

helvella profile image
helvellaAdministratorβ€’ in reply toPiglet1956

34.5 is the actual temperature of my wrist - as far as the AW can tell.

Remember we already have a range of temperature measuring issues - precise position in mouth, ear, underarm, etc. - and use a range of devices. None is exactly the same as any other. The way they vary from each other is not identical. None is exactly the same as your internal deep temperature - the sort that can only be properly taken during an operation.

Any continuous, or near-continuous temperature monitoring has the advantage that the absolute number matters little, if at all. Once the baseline has been established (and yes, that takes days), all we care about is variation from that.

If you use, say, an ear thermometer every day and it always shows 36.6 (just a random number for discussion), then it really doesn't make any difference if that is a degree or three out from "reality". If it was 34.2 or 39.7 this morning - you have a problem!

(That problem could be anything from a serious health issue to a failing battery or poor procedure.)

If you want to present your temperature to a doctor who expects the usual clinical standards of temperature, you might have some difficulty. Or if you try comparing with a friend. But if you want to know whether you currently have a fever, or are approaching hypothermia, that number itself doesn't really matter.

ColdBanana profile image
ColdBananaβ€’ in reply tohelvella

Also, strangely, i felt warm when i was 36.3c at night. And cold towards 37c. As in ice cold hands & feet

Piglet1956 profile image
Piglet1956β€’ in reply tohelvella

Thanks for your reply. I will rethink the Apple Watch as it seems like the temperature functionality could be useful.

helvella profile image
helvellaAdministratorβ€’ in reply toPiglet1956

I don't want to appear as a salesperson. :-)

Check very carefully before deciding.

Rumours suggest the AW 9 is likely to be released later in the year but probably few changes.

And don't pay full price. My 46mm was about Β£70 less than full price but has gone up again.

Piglet1956 profile image
Piglet1956β€’ in reply tohelvella

Thanks for the heads up- it might be worth waiting for the 9 as may mean the 8 is reduced in price.

helvella profile image
helvellaAdministratorβ€’ in reply toPiglet1956

Possibly. I think most of us have tried the price game - but not always come off well!

I got sick of waiting (has been in my mind for at least 18 months - likely much longer) and bit when the price was as low as I expected it to reach.

There's always the refurb option now (AW 8 have only very recently become available as refurbs):

apple.com/uk/shop/refurbish...

waveylines profile image
waveylinesβ€’ in reply tohelvella

Thanks Helvella.... Been thinking about an apple watch for a while as I have Afib and it tracks the heart really well.....& Apparantly you send the readings through to the cardiologist but I have a lovely watch already & thought a watch on each wrist might look a tadge strange!! πŸ€£πŸ˜‚

helvella profile image
helvellaAdministratorβ€’ in reply towaveylines

You wouldn't be the first to wear two watches!

The AW can be worn on either wrist, in case that is significant for you.

And you actually need to have a cardiologist to send information to! Over the last week, my heart ranged 50 to 200.

waveylines profile image
waveylinesβ€’ in reply tohelvella

Crikey was that at rest Helvella? 😯And yes I sadly do have a cardiologist I could send the info to.... Lol.

helvella profile image
helvellaAdministratorβ€’ in reply towaveylines

I know it can reach 190 with me at rest but not certain about 200. I might have been moderately active at that moment.

I don't think it sad you have a cardiologist - just that you need one! You haven't got a spare, have you? (Like having a watch on each wrist. :-) )

waveylines profile image
waveylinesβ€’ in reply tohelvella

πŸ˜‚190 is high for at rest Helvella.... Have you had that checked out?

I do need the cardiologist....infact seeing a cardio thoraisic surgeon on Wednesday.... fills me with fear tbh but if he can sort it out through keyhole surgery am a happy woman!!

I'll share my cardiologist with you Helvella.... He's an EP specialises in anrthymias.....lovely chap but referred me on as he said ablation for me wouldn't be very successful.

helvella profile image
helvellaAdministratorβ€’ in reply towaveylines

I was sent back to GP!

waveylines profile image
waveylinesβ€’ in reply tohelvella

What???? With a resting heart rate of 190? My goodness who on earth did you see? My resting heart rate was 130 & they were definately unhappy with that. I was too.... Felt rubbish! My norm was low 70's - even with treatment it races in the 90's.Did they do a Holter test? It's where you wear a heart tracker & it continously records your heart rate. Alongside that you keep brief notes on how you feel, been doing.

In your shoes I'd research & ask your GP for a second opinion. Pick your hospital. You are entitled to do that. Or go private for a consultation - most do a mix and then ask to go on their NHS list.

helvella profile image
helvellaAdministratorβ€’ in reply towaveylines

Trouble is, mine can drop from 180 to 80 in one pass of the screen. It is all over the place. Just checked and it went from 130 to 58 in one refresh (a few seconds) without actually doing anything other than raise my left arm slightly!

waveylines profile image
waveylinesβ€’ in reply tohelvella

That isn't right Helvella. Keep a record from your apple watch. And you need that Holster test. They set the test length.... Minimum is 24hrs...mine was 48hrs....but they can run the test for several days. It did not show up on a ECG. I've been toying with purchasing a Kardia but it's not cheap & am concerned I'd only be worrying then....If you want can PM who I see.

Imaaan profile image
Imaaanβ€’ in reply tohelvella

Were you ever offered a beta blocker? They gave me one that started with an M for my tachycardia during my sleep endoscopy . My goodness it was fantastic. Almost made me rethink my thoughts on beta blockers.

The highest I've had recorded was in the 120s and its horrendous . Is there anything that helps when you're at 180 and over????

helvella profile image
helvellaAdministratorβ€’ in reply toImaaan

Yes - was offered Bisoprolol. For some reasons I decided not to take it. Just reading up again and can't see a specific reason.

ColdBanana profile image
ColdBananaβ€’ in reply tohelvella

Helvella,I hope you don't mind me asking you. But I thought it might be a good idea since you seem to track your temperatures!

What do you feel might cause my temps to plummit like this towards the end of the day? I couldnt believe it. I tested TWICE to be sure! I only just started tracking them so I don't have much COntext to provide

Yesterday
helvella profile image
helvellaAdministratorβ€’ in reply toColdBanana

I've only just started looking at temperature logging! (My Apple Watch was more for heart rate, etc.)

It is totally normal for temperature to drop as we approach bed-time. Then rise a little while later.

Almost as if our bodies are pushing us to find somewhere warm in preparation for sleeping. Then rising a bit so we stay warm enough through the night.

(But being careful not to go down the rabbit hole of teleological explanations).

ColdBanana profile image
ColdBananaβ€’ in reply tohelvella

This makes sense. Thanks!

Bearo profile image
Bearoβ€’ in reply tohelvella

is it normal for body temperature to drop around Dawn?

I’m often too hot in the early hours and it wakes me up and stops me dropping off again - but around dawn I always seem to have a sudden and noticeable drop in temperature . I’ve never checked with a thermometer.

helvella profile image
helvellaAdministratorβ€’ in reply toBearo

Afraid I don't know! Seems perfectly feasible.

One of the problems is that our feeling hot or cold can move in the opposite direction to our actual temperature!

Not what you're looking for?

You may also like...

Normal body temperatures

My temperature when I first wake up in the morning, through underarm measurement according to Broda...
Vuaiq9 profile image
β€’

What do thyroid labs look like in a healthy individual?

I was wondering if anyone had your thyroid function tested when it was still optimal, that is,...
β€’

Blood results, help please, what to do now?

Medichecks results. TSH 3.49 (0.27-4.2) FT3 4.71 (3.1-6.8) FT4 8.54 (12-22) I am taking two tablets...
snow22 profile image
β€’

Fluctuating body temperatures

I am feeling dreadful, a situation which only shows worsening. I'm weak, exhausted, dizzy,...
reelingenious profile image
β€’

What does a GOOD thyroid result look like?

Hi, I've just got my results from my most recent blood test and my thyroid has gone from TSH 5.1/T4...
Chancery profile image
β€’

Moderation team

See all
PurpleNails profile image
PurpleNailsAdministrator
SlowDragon profile image
SlowDragonAdministrator
Jaydee1507 profile image
Jaydee1507Administrator

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.