CRPS, complex regional pain syndrome, is a condition that usually affects an arm or leg after an injury. The pain is much stronger than the injury would explain and lasts after it heals. It is a condition of the nervous system, and the pain is real. (source: the NIH)
If you just heard those four letters for the first time, you probably have more questions than answers. That’s a normal place to be, and nothing here asks you to decide anything.
You are not crazy. These symptoms are real, and they make sense when we look at the nervous system. This page is educational. It doesn’t diagnose you, and it doesn’t replace the doctor who’s evaluating your pain.
What does CRPS mean, in plain words?
Picture a wrist you sprained, or had surgery on. The tissue mends and the stitches come out, but the pain stays, and it’s louder than the injury ever was. The Mayo Clinic says the pain is out of proportion to the severity of the initial injury. The National Institute of Neurological Disorders and Stroke adds that the limb is often so sensitive that even light touch may feel painful.
The injury healed. The pain didn’t get the message.
You may also see an older name, reflex sympathetic dystrophy, shortened to RSD. That’s the former term for what’s now called CRPS. If a record or a website uses it, it’s describing the same condition.
What does CRPS feel like?
The main symptom is continuous, intense pain, but it rarely arrives alone. The same National Institute of Neurological Disorders and Stroke page says the limb "may also show changes in skin, temperature, nails, or hair, along with unusual sweating."
If you’ve been told your symptoms sound strange, or you’ve wondered whether you’re imagining them, this is why. A burning limb that also changes in skin and temperature is an odd thing to live with. It’s also a recognized pattern, and you didn’t invent it.
| What you may notice | What it can look like |
|---|---|
| Pain | Ongoing, severe, burning, stronger than the original injury |
| Touch sensitivity | Even light touch may feel painful |
| Skin, temperature and sweat | Changes in skin and temperature, with unusual sweating |
| Nails and hair | Changes in nails or hair |
The Veterans Health Library separates early and late symptoms. Early on it lists ongoing, severe, burning pain and sensitivity to touch. Later it adds skin that appears shiny and thin, and abnormal movements of the limb. So the picture you see today may not be the picture in six months, and that’s worth telling your doctor as it shifts.
What are the two types of CRPS?
There are two types, and the difference is whether a specific nerve was damaged. Stanford Medicine labels Type 1 as the form that "happens without a clear nerve injury" and Type 2 as the form that "happens when there is a confirmed nerve injury."
| Type 1 | Type 2 | |
|---|---|---|
| Older name | Reflex sympathetic dystrophy | Causalgia |
Stanford adds that people are sometimes first diagnosed with Type 1 and then have the diagnosis change to Type 2 when later tests show nerve damage. If that happens to you, it doesn’t mean the first doctor got it wrong. A type is a label for how things started. It doesn’t predict how your symptoms will behave.
What does the nervous system have to do with CRPS?
A great deal, though researchers don’t yet agree on a single explanation. The Mayo Clinic says plainly that "the cause of complex regional pain syndrome (CRPS) isn’t completely understood." Stanford lists three possible contributors that may count for more or less in different people: inflammation, nerve injury or scarring around a nerve, and activation of the sympathetic, or "fight-or-flight," part of the nervous system.
The sympathetic nervous system runs your alarm response. The Veterans Health Library calls CRPS a rare disorder of that system. When the alarm stays on after the danger is gone, the pain, the temperature changes and the sweating start to make sense together.
I often tell my patients, "The body never lies, but it does whisper before it screams." Pain works like the warning light on a car’s dashboard. Covering the light doesn’t repair the engine. So instead of asking only how to quiet the pain, we ask why the nervous system is producing it. That’s our clinical view, and it’s one framework among several. It doesn’t replace the medical evaluation you need.
If you want to go further on what might have started it, we wrote about that in CRPS triggers and what could have started it. Our overview of how we treat CRPS at The Spero Clinic is there when you’re ready, and not before.
Can CRPS happen after surgery or a minor injury?
Yes. The Mayo Clinic says CRPS typically develops after an injury, a surgery, a stroke or a heart attack. The pain is out of proportion to the injury, which is part of why it catches people off guard.
Our article on CRPS after surgery covers why it happens and what tends to come next.
How common is CRPS?
It’s rare. Stanford says about 50,000 new cases happen every year in the U.S. It also notes that CRPS might be missed by doctors because early signs can look like normal post-injury inflammation. For you, that means being missed early is possible, and it says nothing about whether your pain was real.
The Cleveland Clinic gives a much larger figure, saying it affects about 200,000 people every year in the United States. The two numbers don’t agree, and neither page explains the gap. Nobody can give you an exact count, and you can hold both figures loosely.
What happens over time?
Outcomes vary a lot, and we can’t tell you yours. The Mayo Clinic says that in some people the signs and symptoms go away on their own, and in others they may persist for months to years. It also says treatment is likely to be most effective when started early, which is a good reason to get a persistent, out-of-proportion pain looked at promptly.
The NIH is candid about the other side. Pain and trouble with everyday tasks can improve over time, but most people with CRPS still have some pain after a year. The Cleveland Clinic adds that CRPS recurs in about 10% to 30% of people. None of that is a verdict on you. It’s a map of the range, and you’re one person within it.
For children, the NIH says CRPS usually gets better within 6-8 months, though some children have symptoms that come back and need more physical therapy. If you’re a parent reading this for your child, that’s worth bringing to the pediatric team.
Hope isn’t a promise here, and we won’t pretend it is. It’s a starting point. Many people with long histories of pain have been told to wait it out or live with it, and a clear name for what’s happening is often the first thing that lets them ask better questions. Hope is still within your reach, even while the answers are being worked out. What improvement can look like in practice is a separate conversation, and we cover it in what CRPS remission looks like. Every story there is one person’s experience, not a forecast for yours.
Common mistakes after a CRPS diagnosis
The first mistake is waiting to see if it settles on its own. It sometimes does. But because early treatment tends to work better, a pain that’s out of proportion to the injury deserves a prompt evaluation.
The second is assuming the label tells you everything. Type 1 or Type 2 describes how it began, not your symptoms, your pace or what will help you.
The third is blaming yourself. The Cleveland Clinic calls CRPS a neurological condition, and the Veterans Health Library describes it as a disorder of the sympathetic nervous system. If someone has implied the pain is in your head, those descriptions are a fair answer.
The fourth is reading every frightening forum post as your future. If you’re worried about spread, does CRPS spread goes through what new symptoms actually mean.
Frequently asked questions
Is CRPS the worst pain?
None of the medical sources we reviewed ranks it against other pain conditions, so we won’t either. What they do say is that the pain is out of proportion to the original injury, and the NIH notes even light touch may feel painful. Both can be true without a ranking.
Can CRPS occur after wrist surgery?
Yes. The Mayo Clinic says CRPS typically develops after an injury, a surgery, a stroke or a heart attack, and the Veterans Health Library notes it may follow a surgery such as carpal tunnel release.
Do people work with CRPS?
Some do, and some can’t. The NIH says that in more severe or long-lasting cases a person with CRPS can’t work or do their usual daily activities. It also says pain and trouble with everyday tasks can improve over time. It depends on severity, the job and the person.
What are the symptoms of CRPS in the leg?
They’re the same as in an arm: ongoing burning pain, sensitivity to touch, and changes in skin, temperature and sweating. The NIH says CRPS usually affects an arm or a leg. Over time it also lists weakness, tremors or stiffness in the muscles and joints.
One thing you can do today
Write down your symptoms, when they began and what injury or procedure came before them, then bring that page to your next appointment. If you’d like to talk it through with a person, you can schedule a free discovery call. We’ll listen to the full picture and tell you honestly whether Spero is a fit, or whether something else makes more sense first.
This is one patient’s individual experience. Outcomes vary, and The Spero Clinic does not guarantee a specific result.
