The nerve block wore off at about 3am on night one and nobody had warned me it would hit like that

Reverse done on Thursday, home Friday, and I want to flag something for anyone else about to go in, because it floored me and I do not think it needed to.

They gave me a general anaesthetic plus a block in the neck for the shoulder, which was explained to me as pain relief for afterwards. And it was extraordinary. I woke up with an arm that was completely dead, no pain at all, could not even feel it, and I genuinely lay there thinking well this is nothing like people said.

Then at about 3am on the first night at home it wore off, and it did not fade politely, it arrived. Went from nothing to the worst pain of the whole thing inside maybe half an hour, in the dark, on my own, with my painkillers sat there having done nothing because I had not taken any, because I had not been in pain. My wife found the discharge sheet and it turns out it does say take your painkillers before the block wears off. I had read that line and it had not landed at all.

So, two questions. Is that sudden a normal way for it to go, and did anyone else get properly caught out by this?

Oh Derek, yes. Mine was about 2am and I have never felt so unprepared for something I had technically been told about. I remember thinking the block was proof I had got off lightly.

Same story here, different hours. Mine went in the early hours of night two rather than night one, which caught me out in a different way because I had congratulated myself on getting through the first night.

What I would say to anyone reading this before their operation is that the arm being completely dead is not how the shoulder is going to feel, it is a temporary loan. Set an alarm and take what you have been told to take on the schedule you were given, not when you decide you need it. That was the bit I got wrong too, treating painkillers as something you take once it hurts.

What you are describing is well recognised and it is worth other readers understanding the mechanism, because forewarned really does change how it goes.

A shoulder replacement is usually performed under a general anaesthetic, very often combined with a regional block, commonly an interscalene block, which numbs the nerves supplying the shoulder and arm. That is why the limb feels not merely painless but absent, including weakness and sometimes a heavy, floppy feel, and none of that is a sign of nerve damage. It is doing exactly what it was placed to do. Blocks of this sort typically give useful pain relief for the first several hours to a day, and the timing varies with the drug used and how it was given, so a block ending in the small hours of night one or night two are both ordinary.

The reason the ending feels abrupt is that the block is holding back the pain of a real operation, so when it fades you meet that pain at whatever level it happens to be, rather than climbing to it gradually. This is precisely why teams ask you to start regular pain relief before the block wears off rather than after, and it is a genuinely common thing for people to read and not absorb, as you found. Some units are more explicit about it than others, and it is a fair question to ask at your pre operative assessment: how long is my block expected to last, and when exactly should I take the first dose. Our page on the anaesthetic and the nerve block explains how the two work together, and preparing for the operation covers the questions worth settling before the day. What I would separate from ordinary rebound pain: numbness or weakness that persists well beyond the expected life of the block, or pain that keeps climbing over days rather than settling, both of which are a call to your surgical team rather than a forum question.

Adding a dissenting note, not on the advice but on the framing. I did not get the dramatic version at all. Mine tailed off over a few hours in the afternoon and it was uncomfortable rather than shocking, and I had taken something beforehand mostly by luck. So do not go in braced for 3am agony as a certainty. Take the tablets on time and there is a decent chance you get my version rather than Derek's.

Ten days on and the rest has been much more manageable than that first night suggested, which I am putting here deliberately in case someone reads the opening post and panics.

The mechanism explanation helps a lot actually. I had been quietly wondering whether something had gone wrong in the operation to produce pain that appeared out of nowhere like that. Turns out nothing appeared, it had been there the whole time and I just could not feel it. Obvious in hindsight, was not obvious at 3am.