Pain Truth Project Condition Directory – CRPS

What Is CRPS?

Complex Regional Pain Syndrome is a clinical pain syndrome. The pain is regional rather than limited to one nerve or dermatome, and it is accompanied by a variable pattern of sensory, autonomic, motor, swelling, and tissue-related changes. The condition often follows a fracture, surgery, sprain, crush injury, or other trauma, although the triggering event may be minor and sometimes no clear trigger is identified.

CRPS is complex and multifactorial. Research points to interacting changes involving the peripheral and central nervous systems, inflammation and immune signaling, blood-flow and temperature regulation, and the way the brain processes sensation and movement. No single mechanism explains every patient.

CRPS is real; psychological support does not make it psychological in origin.

Depression, anxiety, trauma symptoms, sleep disruption, and fear of movement can occur with any severe, persistent pain condition. Psychological care may help patients cope and participate in rehabilitation, but current evidence does not justify treating CRPS as imaginary, personality-driven, or simply caused by emotional distress.

The Two Recognized Types

CRPS Type I

Formerly called Reflex Sympathetic Dystrophy (RSD). Type I is diagnosed when CRPS occurs without a confirmed major nerve injury.

CRPS Type II

Formerly called causalgia. Type II is diagnosed when the syndrome occurs with a confirmed major nerve injury.

The Type I/Type II distinction remains part of formal classification, but expert guidelines note that it may not determine which treatment approach is used. The individual patient’s symptoms, function, risks, goals, and response to treatment remain central.

Possible Symptoms and Signs

CRPS looks different from person to person and can change over time. A patient does not need every item below. The core feature is continuing regional pain that is disproportionate to the expected course of the original event.

Pain and Sensory Changes

Burning, stabbing, aching, electric, or deep pain
Allodynia: pain from normally non-painful touch or movement
Hyperalgesia: an unusually intense response to painful stimulation
Numbness, tingling, or altered sensation

Temperature and Color Changes

An affected area that feels warmer or colder than the other side
Red, pale, blue, purple, mottled, or otherwise changing skin color
Visible or measurable asymmetry between limbs

Swelling and Sweating

Persistent or fluctuating swelling
Increased, decreased, or uneven sweating
Changes that vary with activity, temperature, stress, or time

Movement and Tissue Changes

Reduced range of motion, stiffness, weakness, tremor, or dystonia
Difficulty bearing weight or using the affected limb
Changes in skin texture and hair or nail growth
Muscle loss or contracture in some persistent cases

How CRPS Is Diagnosed

There is no single blood test, scan, or nerve test that proves CRPS. Diagnosis is clinical. A clinician uses the history and physical examination, applies the Budapest Criteria, and considers whether another diagnosis better explains the findings. Testing may help evaluate alternatives or complications.

Budapest Clinical Criteria

1. Continuing disproportionate pain Pain continues and is disproportionate to the expected course of any known injury or other triggering event.

2. Symptoms in at least 3 of 4 categories The patient reports symptoms involving sensory, vasomotor, swelling/sweating, and/or motor/trophic changes.

3. Signs in at least 2 of 4 categories At the examination, the clinician observes qualifying signs in at least two of those four categories.

4. No better explanation No other diagnosis better explains the complete pattern of signs and symptoms.

Symptoms can fluctuate, so a careful history and documentation of changes may matter. Photographs, dated symptom notes, temperature differences, functional changes, and prior clinical observations may help a treating professional understand patterns, but they do not replace an examination.

Treatment and Management

There is no single treatment plan that works for everyone. Expert guidance favors an individualized, interdisciplinary approach centered on restoring or preserving function while also treating pain and other symptoms well enough for the patient to participate in care.

Physical and Occupational Rehabilitation

Carefully paced movement, range-of-motion work, desensitization, functional retraining, graded motor imagery, mirror therapy, and strategies for daily activities may be considered. Treatment should be individualized; forcing activity without regard to severe symptom escalation is not the goal.

Medication

Clinicians may consider non-opioid or opioid analgesics, medicines used for neuropathic pain, topical agents, anti-inflammatory treatment, corticosteroids in selected situations, bone-directed medicines, or other symptom-specific options. Benefits, evidence, risks, and patient history should be evaluated individually.

Procedures and Neuromodulation

Selected patients may be evaluated for sympathetic or other nerve blocks, spinal cord stimulation, dorsal-root-ganglion stimulation, infusion therapy, or an implanted medication system. These are not universal treatments and require specialist risk-benefit review.

Psychological and Practical Support

Pain psychology, counseling, sleep support, pacing, relaxation skills, and peer support may help with coping, fear, grief, trauma, and participation in rehabilitation. Their use does not mean CRPS is psychological or unreal.

Treatment evidence remains limited for many CRPS interventions. Shared decision-making and careful monitoring are especially important when benefits are uncertain or procedures carry substantial risk.

Who May Be Involved in Care?

The appropriate team depends on the patient’s symptoms, location of CRPS, other medical conditions, and available care. It may include:

A primary-care clinician coordinating overall health needs
A pain-medicine specialist, neurologist, or physical-medicine and rehabilitation physician
Physical and occupational therapists familiar with CRPS and graded functional restoration
An orthopedic, hand, vascular, rheumatology, or other specialist when another condition must be evaluated
A psychologist, counselor, or psychiatrist experienced with chronic pain, trauma, sleep, or mood concerns
Pharmacists and other professionals helping monitor complex medication plans

Because CRPS is uncommon and can be difficult to diagnose, patients may need referral to a clinician or program with specific CRPS experience.

Course, Remission, and Possible Complications

The course of CRPS is variable. Some people improve substantially or experience remission; others have persistent pain and disability despite treatment. Earlier recognition and appropriate care may improve the opportunity to preserve movement and function, but no outcome can be promised.

Reduced movement, weakness, muscle loss, stiffness, or contracture
Changes in bone, skin, hair, nails, sweating, temperature, or circulation
Sleep disruption, fatigue, reduced independence, and difficulty working or attending school
Depression, anxiety, grief, or trauma symptoms associated with prolonged pain and disability
Symptoms that extend beyond the original area in some patients

Spread can occur, but it is not inevitable. Claims that CRPS must spread throughout the body—or that Type I and Type II always follow fixed, predictable spreading patterns—are not supported well enough to present as fact.

For Family and Friends

CRPS pain may be severe even when an injury looks healed or outward changes are not visible every day. Symptoms can fluctuate, and ordinary contact—clothing, bedding, a breeze, shower water, or a gentle touch—may be painful.

Believe the person’s report of pain and avoid comparing it with the original injury.
Ask before touching the affected area or assisting physically.
Support treatment goals without pressuring the person to “push through” uncontrolled symptoms.
Help with appointments, transportation, documentation, meals, household tasks, or mobility when requested.
Remember that independence matters; ask what help is wanted instead of assuming.
Learn the person’s triggers, accommodations, and emergency information.

A patient may need encouragement, practical help, and patience—not disbelief or a demand to prove the severity of pain.

When Medical Evaluation Matters

Persistent burning or disproportionate pain, marked sensitivity, swelling, color or temperature changes, or loss of function after an injury should be discussed with a healthcare professional. New redness, fever, rapidly increasing swelling, chest pain, shortness of breath, sudden weakness, or other urgent symptoms require prompt medical evaluation because infection, a blood clot, vascular problems, and other serious conditions can resemble or occur alongside CRPS.

Medical Sources and Further Reading

This guide was adapted from P.A.R.T. Texas’s original CRPS educational work and updated for P.A.R.T. USA using current government health information, validated diagnostic research, and expert consensus guidance.

Medical content reviewed and updated September 2, 2026.

P.A.R.T. USA is preparing a moderated contribution area where members may submit lived-experience information, suggest missing topics, or identify material that should be reviewed. Submissions will not appear publicly automatically, and medical claims will be checked before being added to the educational guide.

The member contribution form will be added here as the next step. The educational guide itself is complete and may be published now.

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