Thyroid disorder and COVID-19 BOOSTER vaccinati... - Thyroid UK

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Thyroid disorder and COVID-19 BOOSTER vaccination. **This Poll is NOT for the THIRD vaccination for IMMUNOSUPRESSED people**

RedApple profile imageRedAppleAdministrator437 Voters

Please select all that apply:

70 Replies
RedApple profile image

**This poll is ONLY for members who have actually been offered the Covid-19 BOOSTER vaccination.

PLEASE DO NOT COMMENT UNTIL you have actually become eligible for the booster.**

DO NOT CONFUSE the THIRD vaccination for IMMUNOSUPRESSED people with the BOOSTER vaccination. This poll is NOT for the THIRD vaccination, ONLY for the Booster.

Comments can be made below, but only about YOUR EXPERIENCE.

This forum is NOT for discussion of the pros and cons of any vaccinations.

Any comments deemed by the admin team to be off topic will be removed.

Our previous two polls for the FIRST and SECOND vaccinations are still open for anyone who hasn’t yet entered their experience of these.

Arlie123 profile image
Arlie123 in reply to RedApple

The symptoms I got from my third booster jab were about the same as the symptoms from the first Covid jab - ie mild flu like symptoms for 24-48 hours. The options above don’t accommodate that so don’t know if you want to tweak. :)

RedApple profile image
RedAppleAdministrator in reply to Arlie123

Thanks Arlie123, but the poll facility is too limited to include any more options I'm afraid :( We have done the best we can with the facilities available! :)

Arlie123 profile image
Arlie123 in reply to RedApple

Understood! :)

Tpdnotts profile image
Tpdnotts in reply to Arlie123

I experienced the same as this comment above.

Pippah45 profile image
Pippah45 in reply to RedApple

My brother in law suffered a Bell's Palsy shortly after his booster - there is a bmj article says this could be related to the jab. I haven't had my booster yet. And I will not be having the Flu jab due to a very bad reaction some years ago.

grumpyold profile image
grumpyold in reply to RedApple

Only side effects from Pfizer vaccinations one and two, were a sore, swollen, achey arm, itchy at site of injection.Booster was Pfizer also. Arm just a tiny bit itchy but not swollen nor achey. This time I felt wiped out and exhausted for 2 days. OK now.

I had a strong reaction to my second jab (all 3 were Pfizer) but a lesser reaction to the booster.

First: no symptoms, Second: 48-72 very heavy fatigue, fast onset, Booster: 24hr delayed onset, ongoing fatigue still evident after fortnight to date. Pfizer for all.

Thyroid17 profile image
Thyroid17 in reply to Thyroid17

Now going through a hyper phase which I assume is temporary.

i had a sore arm after my booster and a bit headachy

LAHs profile image
LAHs in reply to MARZY1969

Yep, same here.

The name on the booster was different to the name Pfizer. But I’ve googled it and it is the same - they’ve just given it a different name. And the staff at the centre said it was Pfizer.

helvella profile image
helvellaAdministrator in reply to sidneymark70

Some of the UK-approved Covid-19 vaccines have multiple names. (Some of these names may only appear overseas.) This is a brief post to try to help clarify:

Oxford/AstraZeneca – branded Covishield or Vaxzevria

Pfizer BioNTech – branded Comirnaty

Moderna or Moderna Takeda – branded Elasomeran or Spikevax

Janssen or J&J or Johnson & Johnson COVID-19 vaccine

Headaches after first Pfizer, sore arm after 2nd, little to no effects after Pfizer booster. 2019 flu jab gave me a painful arm for several days but no issues with 2020 or 2921 flu jabs. Had latest flu jab 3 weeks before covid booster. All good.

Just to say that in relation to this poll: I had covid in March 2020 - not badly affected but have been dealing with long covid since September 2020 - was gradually feeling better in January 2021 - 1st jab in February and felt that I'd been knocked back. Didn't feel well for some time. 2nd jab April, no effect at all, except for sore arm - Flu jab 2nd October - again nothing really except for sore arm then booster 3 weeks later on 22nd October and no reaction at all - except for sore arm. Not sure how useful this information is to your poll.Thanks for the work you all do within Thyroid UK

Thank you for the poll. I had both the Flu jab and booster this lunchtime and - fingers crossed - so far, no reaction at all, not even a sore arm. Never even felt it. And I usually do. Had Astra zeneca previously but Moderna for booster - apparently that’s what happens. Good luck everybody!

I left it a few days before responding to this poll, because I knew that some people only started to experience symptoms from the booster after a day or so. I had the Pfizer booster last Saturday and am thankful to say that I did not have any bad effects from it at all. I wish I had had that one earlier in the year instead of AstraZeneca, the first of which had made me very ill for days afterwards. Thank you to those people who responded to my initial post about the boosters, prior to the poll being posted.

I had my booster yesterday, it was Pfizer. The original two were AZ (bad side effects from the first, minor side effects from the second including a slight headache that lasted over a week)

So far I think I've got away pretty lightly. I felt a bit queasy and headachy, but the main side effect is sore stiff joints (apparently quite a common side effect) It's not as bad today as it was last evening (had the jab at about 9.30 am) so I'm hoping that it will ease off gradually over the next few days.

My brother has had sore joints for over a week after his though (also Pfizer)

(Oh, also, arm is still sore where the needle went in, and aches a bit, but I think that's almost inevitable unless you're very lucky)

I had pfizer booster yesterday morning (2 previous were AZ)

History - I was super poorly after my 1st AZ with almost every side effect going even the 1/100 ones, took 10/14 days to fully recover. The 2nd AZ i just got a delayed sore arm (strange was fine till day 6 then arm went red n sore)

So i was warned by the nurse that did my mums booster that experience from health professionals showed that i was likely to react in same way to the PZ booster as my 1st AZ jab. Luckily i haven't, phew, i have a headache but so not on the scale as before and last night i was extra tired but also very cold sleeping in big jumper and wooly scarf, muscles in neck are tight this morning but that may well be tension from expecting the worse!

Also hubby had his yest and as usual for him no side effects at all.

Hope everyone else is ok with their booster too xx

mrsm49 profile image
mrsm49 in reply to mrsm49

PS oh i forgot to mention i have sore arm as usual lol

Usual sore arm but this time the booster jab had me feeling ill and fluey the day after and spent most of the day in bed - the booster was Pfizer.

No problems with the first two which were AZ. Booster was Pfizer and joint pain and fatigue lasted 24 hours.

Four days after the Pfizer booster, heart started racing and blood pressure raised. Now on medication for both. ECG was ok and awaiting 24hrs ECG. My pulse is still erratic, fine and then at times racing.

Sore arm with all three. No other symptoms. Az first two, pfizer for booster. Had fly jab about 6 weeks before.

FYI: My third Moderna booster was half dose. I had no problems but know of someone who went early receiving a full dose Moderna booster & are now under specialist doctor care for problems. They do not have thyroid problems however.

2x Pfizer, Flu jab, Moderna - 4 x sore arm, nothing else.

Had Pfizer booster just over a week ago sore arm like toothache type pain still ongoing, had headache and felt fatigued and felt quite poorly for about 5 days but feeling fine now. First two jabs were Az and had slight headache and felt fatigued and bit of sore arm for couple of days but not as bad as the Pfizer side effects. Had flu jab about three weeks before normal side effects of sore arm and feeling a bit off colour for a couple of days.

Both my wife and I had the same response you describe. Little reaction to first two doses (Astra Zen) but strong reaction to booster (Pfizer) wiping us out for a few days and still not fully right on day 5. Also the sore arm. My wife had a bad rash for 2 days but not me.

Pfizer booster 4 days ago, az first and second. Initially headache and tired, usual sore arm but otherwise fine. A little anxiety and large increase of ectopic heartbeats last few days. Still adjusting T3 as only been taking a few months, I never put the booster and these symptoms together but maybe they are as I was fine till I had it. Hope it settles soon.

My first two jabs were AZ of which the first one gave me fatigue for a week, plus sore arm. The second jab had no problems. But the third one was Pfizer and I had fatigue again for a week and felt unwell. So I guess it may well be stronger than Pfizer !?

I have had 3 vaccines, all Pfizer, also had Covid early on in the pandemic. No problems with any vaccine at all. Also received the flu jab one week after 3rd booster, no problems at all.

AZ for first two and Pfizer yesterday. Have an aching arm today but otherwise fine. With the AZ I felt ill both times, had to go to bed and take Paracetamol.

Had Astrazenaca the first 2 times, in bed for 5 days after 1st dose, 2nd dose was ok in comparison but felt awful with 1st dose, sweats, cold, nausea etc., Flu Jab no problem just a bit of a sore arm, Booster jab last week was Pfizer, only reaction was feeling really hyper after for a few hours and next day a very sore, swollen arm which 5 days later is now starting to settle and itch but ok and manageable. Other than that all ok and I am just so grateful to have had all 4 vaccines and hopefully that is it for a while :)


Thank you for the poll - a great idea and the comments are very helpful. Just one question. If there were 385 votes and only 163 people had experienced negligible or no symptoms from the booster, then does that mean that 222 people had symptoms from the booster? It would be interesting to discover what those symptoms were and how many had them.

helvella profile image
helvellaAdministrator in reply to Tugun

The severe limits on the poll facility make it very difficult to offer all possible options.

165 - I experienced negligible or no symptoms from the BOOSTER vaccination

59 - Symptoms I experienced from the BOOSTER were WORSE than my previous two vaccinations

We end up with 343 - 165 = 178 who did not say they had negligible or no symptoms.

And 178 - 59 = 119 who did not say their symptoms were worse.

I think we could guess that 119 felt their symptoms were worse than negligible but not worse than the original doses.

However, it isn't certain everyone voted with that in mind!

Symptoms, I'm afraid, depend on your reading through the replies.

Tugun profile image
Tugun in reply to helvella

Thanks for your reply. Lots to delve into. You're right. Reading the replies is definitely helpful.


Have replied already but want to add that since Saturday ( two days after booster) I’ve had dreadful shoulder pain which shows no sign of going away. Can’t attribute it to anything else.

I had dreadful shoulder pain after second jab in April - first and second were pfizer. After six weeks the pain eased but it has never gone away. I can't move my arms without pain. Pain keeps me awake at night. I was diagnosed with long covid after having very mild covid in February 2020. I never had muscle aches in my shoulders before the second jab.

My pain has eventually gone but shoulder is still not very comfortable

Booster (P) on Tuesday afternoon, worse than 2nd AZ but nothing like the horrendous time I had with 1st AZ.

Flu like side effects were stronger than dose 2, similar to what I experienced with 1st dose of AZ, but this time I got a fever (38.2) rather than drop in temp (34.7 I think it was with az). Strong muscle/joint aches and pains that codeine took the edge off, headache was noticeable but not bad I think linked to my neck pain as well as dehydration from fever and side effect in own right. I felt pretty rough the following morning when these mainly kicked in and stayed in bed all day, slight symptoms the pervious night Inc sore throat and sore arm..

I had the worst watery diarrhoea the following afternoon/eve started irca 22h post vaccine which was a bit of a suprise as came from nowhere and was off my food/a little nauseous that day (very unlike me). Not sure if the runs mainly eased off when took codeine for pain or were going anyway. Temp down to 37.5 by 8pm (still a good degree over my usual).

Last night I struggled to sleep initially from discomfort/raised body temp and irritable (particularly when I discovered my partner had used all the paracetamol and put 2 empty boxes back in the cupboard so didn't have anything to bring down fever when could no longer comfortably ride it out). Then just awake, wasn't tired but wired like I was for with first dose but certainly my body wasn't in the mood for sleep, happy to rest and relaxed and caught up on some sleep this morning.

Temp coming down now (36.8). Not in anywhere near as much pain, arm still sore but improving feels like I should be over the worst of it in 48h from vaccine, doesn't seem to have interacted with my thyroid meds this time (as yet), had slight palpations and increased resting heart rate but I think that is more down to immune response and how I get when struggling due to ME flare up than anything else. I've skipped today's dose just in case and will restart tomorrow.

Didn't get the brief improvement in both physical and cognitive symptoms I got with 1st dose but my allergies have definitely seemed better, don't feel as much nasal congestion as usual.

There wasn't an option for worse than one better than the other, so haven't responded re the worse or negligible tick box as neither. As per other comments I can see this is a restriction in the poll.

I'll come back in a few days to confirm if had any other issues or if resolved.

HGP1 profile image
HGP1 in reply to HGP1

Had egg free flu jab 5 weeks prior, was a bit itchy at injection site then 11h later wide-spread itching and IBS flare up. sore arm for a few days. Didn't want to risk having at same time due to strong reactions to first vaccines, glad I didn't as would not have wanted the itching and cramp on top

HGP1 profile image
HGP1 in reply to HGP1

The improvement in thyroid levels since interaction after dose 1 making me over medicated have stayed stable since my last update, currently on 50mg levo, better in myself and BBT about a degree higher than pre vaccine into normal range. (Was on 87.5mg pre covid vaccine Feb 2021)

HGP1 profile image
HGP1 in reply to HGP1

Getting some mild over medicated symptoms, mainly heart related so skipping meds again today to see if improves, if it doesn't I'll speak to 111 or GP on Monday if seems manageable. I had felt good in myself yesterday so tried catching up on some chores but this was pushing my HR too high, making me breathless and pale.

This morning my resting HR is 20 higher than usual which previously combined with it increasing more than usual when I tried to do anything other thay lay down was resolved by reduction in levothyroxine.

Moderna booster following AZ for first time two doses. Flu jab twelve days previously. No reaction to flu, slight sore arm following AZ, slight headache following AZ. Sore arm next day from Moderna, slight feeling of nausea the same day, very tired and dopey the next day. Stiff and sore joints for a couple of days.

Mild Covid infection in March 2020, and developed ongoing Long Covid. No hint of hypothyroidism back then.1st dose Pfizer February 2021 : exacerbation of all LongCovid symptoms following that, plus a frozen shoulder (extremely painful and debilitating) which have never gone away. Lots of blood tests which were all fine.

2nd dose Pfizer May 2021:

No changes to any symptoms, which have always been breathlessness on very mild exertion, Orthostatic intolerance, fatigue, swollen glands in neck and throat, ghastly palpitations and ectopic beats, plus lots of other stuff.

Booster Moderna + flu: November 2021, mild symptoms.

In October my GP did more bloods. TSH had gone from 4.2 to 14.8 in the months since pre 1st Pfizer.

Started 50mcg Levothyroxine on 23/10/21, and I fancy that I’m feeling very very slightly better - but that could be wishful thinking!

I understand everyone is getting Pfizer!3 days on I'm starting to feel better, very achy after the booster and tired with face migraine or neuralgia which I haven't had for a long time but it could be the time of the year, I had AZ for the first two. Had a bit Candida flare up after the 1st, and flu like symptoms after the second and third, not much of an ache in the arm.!

SeasideSusie profile image

First 2 vaccinations Astra Zenica. Booster was Pfizer.

No reaction at all to first 2 vaccinations.

After the booster the injection site was a bit achy for a few hours and I felt a bit more tired and a bit more breathless than normal (I have lung disease so suffer breathlessness), this lasted for about 3 days.

As some people have said/wondered if it makes a difference to thyroid test results, I tested with MonitorMyHealth 10 days after booster. FT4 and FT3 have come back higher than in my July MMH test - FT4 increased from 65% to 80% through range, FT3 from 78% to 95% through range. I have no idea if this is a result of the booster so will repeat test in a couple of months.

I had my booster 2 days ago. I had AZ for first two vaccinations. I felt dreadful after my first AZ vaccination for 3 days. I felt nothing at all from my 2nd AZ vaccination. I had Pfizer for my booster and felt quite bad. Shivering, aching etc flu like symptoms and sore arm. Feeling bad I believe is a good thing as you know that your immune system is responding well to fight covid if you catch it. I’d be more concerned if I felt nothing at all for all my vaccinations. I now feel more protected. I have Hashimotos and have the DIO2 gene positive. Generally I feel very well these days with my thyroid levels good and vitamins all optimal, it did take a while to get myself optimal but all good now and keeping it there.

2 x Pfizer initially - first no reaction, second one a bit fluey the evening of the jab. Moderna booster yesterday and temp, aching, nausea and vomiting overnight. Wasn’t expecting that. Just tired now (unsurprisingly) and hoping the worst is over

nellie237 profile image
nellie237 in reply to Tillyxx

Hi Tillyxx,

I was very, very close to vomiting after the Moderna booster (I wasn't expecting that either), and see that you are coeliac too. I thought you might be interested, and hope that you are feeling better.

If they decide we need to get another booster I am not having Moderna again. The 1st 2 jabs I had were AZ.

Tillyxx profile image
Tillyxx in reply to nellie237

That is interesting. I ran a high temp for 3 days and felt dreadful. I’d have it again if needs be, but would choose any other if there was a choice!

First two jabs Astrazeneca. Reacted to first jab with fatigue and aches/pains. No reaction to 2nd. Moderna Booster - really awful vertigo and my tinnitus was elevated to another level! This happened 36 hours after - not sure if related or just coincidence.

The 1st 2 jabs I had were AZ. The booster was Moderna. Side effects were mild flu symptoms for 24hrs. The worst symptom was nausea.

Just wanted to say I had flu jab at the end of September and I was fine. Had AZ for first covid jabs and had Pfizer booster last week. One thing I've noticed is with the first AZ jab and now after the Pfizer one I had similar flu type symptoms which went after about a day. However one more lasting after effect on both jabs is that in the early hours of the morning, between about 4 and 5am I wake up with burning pain in my throat neck chin and tongue. It lasts for about a couple of hours and then I fall back to sleep and when I wake up its gone. I remember it did eventually disappear with first jab and hopefully will gradually go away again soon. Can't remember how long it took to go though. Think it was at least a couple of weeks. Has anyone else experienced this?

helvella profile image

Having had AstraZeneca for my first two vaccinations, two weeks ago I had Pfizer/BioNTech Comirnaty as a “booster”.

The injection was noticeable rather than almost undetectable like the AstraZeneca. (The nurse was obviously very experienced, so I suspect the needle/vaccine rather than skill.) I chose the opposite arm to my AstraZeneca, so I could be sure I was separating the injection locations.

Over the next few days, I had very minor discomfort around the injection site. Not at all significant.

Then I went through a few days when I felt slightly warmer than usual. It was as if I was very slightly over-dosed on levothyroxine. Which has resolved and am back to how I felt before the booster.

Had COVID booster (Pfizer) 36 hours ago first 2 were AZ. Hot and shivery about 15 hours later with headache, joint pains and flu like symptoms.

2nd night now clammy and heart over 120 even with paracetamol, hopefully this will pass


3rd day. Was still feeling under the weather and seem to need more fluid as thirstier than normal.

4th day. Feeling a lot better but still have a thirst, do not think I have eaten anything salty.

First 2 vaccines were AZ

1st Shivering and headache later in the day as I had it around 10am, could not get warm in bed that night. Took paracetamol for headache which lasted about 36hours.

2nd No side effects to talk off.

Sorry, I missed the top one - yes I am taking prescription medication. First two doses A Z and booster P sore arm but that was all.

First two vaccinations were Astra Zeneca. I had no reaction whatsoever with those.The booster was Phizer, we were given no choice over the booster which was given by an NHS centre set up in Chichester carpark.

I had damaged my knee ligaments a couple of months earlier (X-ray next Monday) and although I could walk carefully to the centre from the car, about 3/4 hour after having the booster the pain in my knee joint was so unbearable that I couldn’t walk a single step or put any weight on my knee. It was definitely the jab that had caused so much more pain in the joint.

I also had my booster in the Chichester car park, with Pfizer after AZ initially.

I could feel the first two jabs but didn't feel a thing with the booster, and no problems afterwards [most of my friends and family have had "issues" with a Pfizer booster after AZ so I'm feeling pretty lucky]

Sorry you've had problems - bope your knee is better soon x

Yours were the opposite to mine then, I didn’t feel the first two but the booster hurt like heck when she stuck the needle in.

Thank you, so do I because the constant pain is knife like nagging, it stops me sleeping too. x

That's really interesting Ellie-Louise. I've been having knee problems recently and it was getting better but since the booster its got increasingly more swollen and painful but until now I hadn't put the two together

You have my sympathy, you don’t give a single thought to walking about until it gets difficult. x

You're so right! I've been walking about Christmas shopping very gingerly and I tried to help my daughter with packing for her moving house next week and I felt so flipping useless! Think I need to just try and rest it up for couple of days. Hope your knee is better soon x


Had booster yesterday, all 3 of mine were Pfizer, usual really, a bit headachey, felt a bit sick, sore aching arm. My husband is the same, we had all our jabs at the same time, his arm is hurting quite a bit more than the last two times. Feel a bit achey today but I worked out last night so could be that.

Had a flu jab about a month ago, just had a sore arm with that one.

I had little reaction to first 2 astra zenica jabs. Had my moderna booster on Friday morning & by evening was feeling very unwell. Headache, severe burning in my feet all night, insomnia, slight fever, very painful arm. However, now feel fine 48 hours later. Phew!