The Crash Does Not Arrive While You Are Doing the Thing. It Arrives Two Days Later.
That delay is why post exertional malaise gets missed, dismissed and misunderstood, including by people who have it. If the payback landed immediately you would have worked out the pattern years ago. Instead it turns up on Wednesday for something you did on Monday, and nothing seems connected to anything.
Post Exertional Malaise, Defined Properly
PEM is a worsening of your symptoms after exertion that goes beyond what your body can currently handle. It is a hallmark feature of ME and chronic fatigue syndrome, and it is common in Long COVID. It also turns up in fibromyalgia and some autoimmune conditions.
Three features separate it from ordinary tiredness, and all three matter.
What a crash feels like varies, but the usual mix is profound fatigue that rest does not touch, worse pain, brain fog, unrefreshing sleep, flu like symptoms, and a sudden intolerance of light and noise.
A Typical Crash, Mapped Out
This is roughly how it runs for a lot of people. The exact timing varies, but the shape is consistent, and once you can see the shape you can start to work with it.
You have a good day
You feel better than usual, so you use it. Errands, a catch up with a friend, the washing that has been waiting. It feels fine at the time. It might even feel great.
Slightly off
A bit heavier, a bit foggier. Easy to put down to a poor sleep or the weather. Most people carry on as normal today, which is what turns a small crash into a large one.
It lands
Profound fatigue, pain, brain fog, flu like symptoms. This is when people usually search for answers, two full days after the actual cause.
The bottom
Function drops. Plans get cancelled. Rest does not seem to restore anything, which is the part that makes it so demoralising.
Slow climb back
You come up gradually. Then a good day arrives, and unless something has changed, the cycle starts again from day one.
This is the whole problem in one sentence. Your body gives you the bill on day three for something you bought on day one, so the feedback you need in order to pace yourself arrives far too late to be useful. Everything that follows on this page is about getting that information earlier.
Exertion Is Not Just Physical
People pace their walking and then wonder why they crashed anyway. Every one of these draws from the same account, and for a lot of people the non physical ones are the bigger cost.
Physical
Walking, stairs, showering, carrying shopping, cooking. The one everybody already counts.
Cognitive
Concentrating, reading, screens, admin, decisions, a long conversation. Frequently the most expensive item on the list and the least accounted for.
Emotional
Stress, conflict, grief, excitement, a difficult phone call. Good news costs energy too, which surprises people.
Orthostatic
Being upright. Standing in a queue, sitting without back support. If this one is significant for you, it is worth reading about orthostatic intolerance and POTS.
Sensory
Noise, bright light, crowds, supermarkets. A shopping centre can cost more than the walk to get there.
Digestive and other
Large meals, alcohol, infections, poor sleep, hormonal changes. These lower the ceiling before you have done anything at all.
We Do Not Do Fixed Incremental Exercise Programs
A lot of people with ME, chronic fatigue syndrome and Long COVID are wary of exercise professionals, and the history behind that is reasonable. For years the standard advice was a programme of fixed, pre planned increases in activity, regardless of how you responded. For people with PEM that approach can cause real harm.
In 2021 the UK's National Institute for Health and Care Excellence updated its ME and chronic fatigue syndrome guideline (NG206). It states that programmes based on fixed incremental increases in physical activity should not be offered as a treatment, and that people should be supported to stay within their energy limit rather than push through symptoms.
That is the approach we work to. If anyone offers you a set programme that increases every week no matter how you feel, that is your signal to ask questions.
What we will not do
- Set a fixed weekly increase and hold you to it
- Tell you to push through symptoms
- Treat a crash as a motivation problem
- Assume your limits are psychological
What we do instead
- Find your current genuine limit, honestly and without pressure
- Work well under it, on purpose, for as long as it takes
- Adjust down without any fuss when your baseline drops
- Accept that some weeks the right plan is rest
Four Things That Make a Real Difference
Find your energy envelope, then stay inside it
Your envelope is the amount of total exertion you can do on an ordinary day without triggering a crash. Not your best day. Your ordinary day. Working out that number is the single most valuable thing you can do.
- Set the limit using an average day, then deliberately work below it
- Count cognitive, emotional and sensory load in the same budget as physical
- Break tasks into pieces with rest between them, rather than finishing in one go
- Sitting down to do something that you would normally stand for is a legitimate strategy, not giving up
Learn your own early warning signs
Because the crash is delayed, you need signals that appear before it. Most people have two or three reliable ones, and almost nobody has identified them until they go looking.
- Common early signs include a heavy feeling in the limbs, a sore throat, sudden irritability, word finding trouble, or eyes that struggle with light
- When one appears, stop straight away rather than finishing what you are doing
- Some people find a wearable heart rate monitor helpful, since heart rate often rises before symptoms do
- Write your signs down and put the list somewhere you will actually see it
Rest before you need it, not after
Rest taken in advance of a demanding task is worth considerably more than the same rest taken afterwards. This feels counterintuitive and it is one of the more effective changes people make.
- Schedule rest before and after anything you know will be costly
- Proper rest usually means lying down in a quiet, dim room, not scrolling on the couch
- Build recovery days into the calendar after appointments, visitors or outings
- Protect your sleep routine, because poor sleep lowers tomorrow's ceiling before you start
Keep a simple record
Because cause and effect are separated by days, memory is useless here. A written record is the only way to find your patterns, and it usually takes about three weeks before something obvious jumps out.
- Three lines a day is plenty. What you did, how you felt, how you slept
- Note the non physical load too, since that is where the surprises tend to be
- Rate symptoms out of ten so you can compare across weeks
- Bring it to appointments. It is far more useful than trying to recall a fortnight from memory
What to Do in a Crash
You will still crash sometimes, even doing everything right. Having a plan already written down helps, because a crash is exactly when decision making is hardest.
Reduce load immediately and completely
Do not try to ride it out or keep the week's plans. Cancel early rather than late. A crash caught on day two is usually shorter than one you fought through until day four.
Make the environment quiet and dim
Light and noise are load. Lying down in a darkened room genuinely does more than sitting up somewhere bright, even if you are not asleep.
Keep fluids and food simple
Small, easy meals and steady fluids. Digestion has a cost, and this is not the week for anything elaborate.
Come back slower than you feel you need to
The first decent day after a crash is the highest risk day there is. Return to well under your usual baseline for several days before you go anywhere near it.
Write down what preceded it
As soon as you are able, note the two or three days before the crash. Over time this is how you find the triggers you did not know you had.
Do not treat it as a failure
Crashes are information, not evidence that you did something wrong. Treating them as personal failure adds emotional load, which is its own cost.
What Support Looks Like at Accelr8 Rehab
We are in Weetangera, Belconnen, and we see people across the whole range, from those managing a job with careful pacing to those who are mostly housebound. The approach is the same in principle and very different in practice.
- Working out your actual baseline Without testing it to destruction. Assessment for PEM looks nothing like a standard fitness assessment, and it should never leave you crashing afterwards.
- Pacing support and symptom tracking Helping you read your own record, spot the patterns you are too close to see, and adjust. Often this is most of the work.
- Remedial massage at a tolerable intensity Hands on treatment can ease pain and tension without demanding anything of your energy system. It has to be pitched correctly, and we would rather do too little than too much.
- Movement only when and if it is appropriate For some people, small amounts of individualised movement have a place. For others, at this point in time, they do not. We will tell you honestly which one you are, and revisit it.
Questions People Ask Us
Is PEM just deconditioning from being inactive?
No. Deconditioning produces fatigue during and immediately after effort, and it improves steadily with activity. PEM is delayed, disproportionate to the effort, and worsens with the very approach that fixes deconditioning.
Deconditioning can certainly develop alongside PEM if someone has been unwell for a long time, but treating the two as the same problem is what leads to people being made worse.
Will I ever be able to exercise again?
Possibly, and it depends entirely on where you are. Some people, once pacing is well established and stable for a long period, can tolerate small amounts of carefully individualised movement. Others cannot, and pushing it costs them far more than it returns.
The honest answer is that this is not a question to answer in month one. Stabilising first, then reassessing, is the right order. Anyone who promises you a return to exercise on a fixed timetable is not being straight with you.
How long does a crash usually last?
Anywhere from a day or two to several weeks. The size of the trigger is a poor predictor. What does seem to matter is how quickly you reduce load once it starts, which is why early warning signs are worth the effort of identifying.
Can massage trigger PEM?
Yes, if it is too intense or too long. Treatment is a demand on the body like anything else. This is why the first massage should be shorter and lighter than you might expect, so we can see how you respond before doing more.
Pitched correctly, most people find it helps with pain and sleep without costing them energy. Tell us if you crashed after a session, because that changes what we do next time.
Do I need a diagnosis before I book?
No. Plenty of people come in still working through the diagnostic process, or with Long COVID that has not been formally labelled. Pacing support does not depend on having a name for it.
We are not a diagnostic service though, so if you have not yet seen a GP about persistent fatigue, that is worth doing in parallel. There are other conditions that need excluding.
Everyone tells me I just need to build up slowly. Are they wrong?
They usually mean well, and for most health conditions they would be right. For PEM specifically, building up on a set schedule regardless of symptoms is the approach that current guidance advises against.
The distinction is between increasing because a calendar says so, and increasing because your own stable baseline has genuinely shifted. The first is a plan imposed on your body. The second is a response to it.
Related Reading
You Do Not Have to Work This Out Alone
Bring your symptom record if you have one, and your questions if you do not. First appointments are deliberately unhurried, and nothing will be asked of you physically on the day.
Clinical position informed by the National Institute for Health and Care Excellence guideline NG206, Myalgic encephalomyelitis (or encephalopathy) and chronic fatigue syndrome: diagnosis and management, 2021. This article is general information for people living with post exertional malaise and is not a substitute for individual clinical advice. If your symptoms are new, changing or worsening, please see your GP.