Complex Regional Pain Syndrome

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Condition Basics

What is complex regional pain syndrome?

Complex regional pain syndrome (CRPS) is a term used to describe a group of painful conditions. Examples of earlier names for these conditions include reflex sympathetic dystrophy, causalgia, and Sudeck's atrophy.

Pain is the main symptom of CRPS. Most people have severe pain in an arm or a leg. Usually the pain is in a part of your body where you had surgery or an injury. The pain is usually constant and either shooting, sharp, or burning. The pain is much worse and it lasts much longer than you would expect for the kind of injury you had. Some people may not have had an injury or surgery before the pain started, but most people have.

CRPS can happen to anyone at any age. Females in their 40s to 60s are more likely to get it.

CRPS isn't the same for all people. Many have mild symptoms and slowly get better over time. But some people may not recover. They may be left with long-lasting pain and disability.

What causes it?

The cause of complex regional pain syndrome (CRPS) is not well understood.

The pain usually starts after a limb or joint has had a serious injury, such as a broken bone, a gunshot wound, or a deep wound. The injury might also be caused by an accident, a fall, or surgery. It can even be caused by a minor injury such as a sprain. For some people, CRPS starts without an apparent reason. It isn't clear why some people get CRPS while others do not.

What are the symptoms?

Symptoms of complex regional pain syndrome (CRPS) are usually only in one arm or leg and include:

  • Pain that's much more severe and lasts much longer than what you would expect for the kind of injury you may have had.
  • Skin that may be blotchy or shiny.
  • Skin that may feel hotter or colder than other areas of your body.
  • Swelling, joint stiffness, weakness, or shaking in the painful arm or leg.
  • Sweating, numbness, or tingling in the painful arm or leg.

Like other conditions that cause chronic pain, CRPS can also cause sleeping problems, anxiety, mood swings, sadness, and depression.

When pain is extreme, some people who have CRPS think about death or suicide. If you or someone you care about talks about suicide or feels hopeless, get help right away.

How is it diagnosed?

Complex regional pain syndrome (CRPS) is not common, so diagnosis can be hard.

There's no one test to diagnose CRPS. Your doctor will ask about your symptoms and past health. You will also get a physical exam. The exam may include touching your skin or bending your joints in the area that hurts.

Your doctor might also compare the color and temperature of the painful arm or leg with the matching, healthy one. For instance, if your left arm hurts, your doctor will compare it to your right arm.

More tests may be needed to rule out other possible causes of your pain and to make a correct diagnosis.

CRPS can be hard to diagnose. Your doctor may suggest that you see a specialist. This may be a neurologist, a rheumatologist, or a pain specialist.

How is CRPS treated?

Treatment for complex regional pain syndrome (CRPS) is divided into four areas:

  • Pain management
  • Physical rehabilitation (rehab)
  • Counseling or psychotherapy
  • Patient education and self–management

Pain management

The goal of pain management is to help you do more and feel better. It also helps you be able to do rehab.

Medicine can be used to help with pain from CRPS. There are different medicines that may be tried. You may also have medicine to help you sleep.

Medicine is only part of the treatment for pain from CRPS. Most people with CRPS see a pain specialist or go to a pain management clinic. You may work with different people for the various parts of your pain management plan.


It may seem very odd that treatment for CRPS includes moving your painful limb, especially when any movement of that limb causes you severe pain. But occupational therapy and physical therapy are helpful parts of treatment for CRPS.

Most patients who have CRPS see a physical therapist or occupational therapist (or both). This type of therapy may not even involve touching your painful limb, at least at first. Gentle limb movement and treatment to help the limb feel more normal (called desensitization) are two therapies used for CRPS. After a period of time, you may move on to more active use of your painful limb, such as doing stretches or weight–bearing exercises.

Rehab may also include other treatment, such as:

  • Mirror therapy. For this therapy, the therapist places a mirror so that the reflection of your limb that is not painful makes your brain think it is looking at your painful limb. When you look at this "virtual" limb in the mirror and you move it without pain, your brain "sees" painless movement in your painful limb.
  • Transcutaneous electrical nerve stimulation (TENS).
  • Hydrotherapy.
  • Setting goals, pacing yourself, and prioritizing activity.
  • Relaxation techniques.
  • Sleep hygiene.
  • Tai chi and qi gong.
  • Electrical nerve stimulation.


Counseling for CRPS includes ways to help you manage the pain and disability that comes from the condition. Cognitive–behavioral therapy (CBT) is the type of counseling used most often for CRPS. CBT can help you to:

  • Look at–and change–the way you think about your condition.
  • Change things you do (behaviors) that make the pain or disability worse.

CBT will also include training on:

  • Coping skills.
  • Relaxation.
  • Activity and exercise, including taking breaks and pacing yourself.


One of the best things you can do to help with CRPS is to learn everything you can about the condition. Your doctor (or doctors) should be able to help you with this. The more you know about what CRPS is and how you are affected by it, the better you will be able to help in your treatment.

Learn as much as you can so that you know the best ways to help yourself get better.


Current as of: December 20, 2023

Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

The Health Encyclopedia contains general health information. Not all treatments or services described are covered benefits for Kaiser Permanente members or offered as services by Kaiser Permanente. For a list of covered benefits, please refer to your Evidence of Coverage or Summary Plan Description. For recommended treatments, please consult with your health care provider.