Complex Regional Pain Syndrome (CRPS) is a persistent pain condition that usually affects an arm or leg after an injury, fracture, sprain, surgery, or sometimes even a minor knock that would normally settle. The key feature is ongoing pain that is out of proportion to what would be expected for the original injury. Along with pain, people can develop changes in skin temperature, colour, swelling, sweating, movement, strength, and even the way the brain “maps” and recognises the affected limb.
CRPS is not “all in your head”, but it involve the nervous system becoming overprotective. Think of it like a car alarm that becomes so sensitive it goes off when a leaf falls on the bonnet. With CRPS, the nerves in the limb, the spinal cord, and the brain can start amplifying danger signals. This can make normal touch feel painful (known as allodynia), make movement feel threatening, and lead to the limb being under-used. Unfortunately, reduced use can then drive stiffness, weakness, and further sensitivity.
CRPS is commonly discussed as:
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CRPS Type 1: no clear nerve injury identified (more common).
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CRPS Type 2: follows a known nerve injury.
CRPS can also present as a “warm” pattern earlier on (redder, warmer, more swollen) or a “cold” pattern later (cooler, dusky, sweaty, more stiff). Not everyone experiences the same symptoms and symptoms can change over time.
Because CRPS affects pain, movement, circulation, and the way the brain processes the limb, physiotherapy for Complex Regional Pain Syndrome is a central part of treatment. A physiotherapist helps you rebuild safe movement, restore function, calm sensitivity, and gradually retrain the nervous system with approaches such as graded exposure, desensitisation, pacing, and CRPS physiotherapy exercises that match your symptoms and stage. Early recognition and early, guided rehab can make a real difference.
Key Facts
- A review of modern principles of CRPS management states that treatment is centred on physiotherapy and occupational therapy to improve strength, motor skills, sensory perception, and sensorimotor integration. 🔗
- CRPS incidence is commonly reported in the range of approximately 5 to 26 per 100,000 people per year. 🔗
- CRPS occurs in about 0.2–9% of people after a bone fracture or ligament injury, 2–5% after a nerve injury, and 1–13% after surgery to an arm or leg. 🔗
- CRPS is grouped into two main types, known as CRPS-I and CRPS-II. 🔗
Risk Factors
- Fracture, especially wrist or ankle fractures, or significant limb trauma
- Surgery to the limb, particularly if followed by prolonged immobilisation
- Other conditions that may increase risk include fibromyalgia and rheumatoid arthritis.
- Higher pain levels early after injury, ongoing swelling, or sensitivity that seems disproportionate
- Smoking (linked in some studies to higher risk patterns in trauma populations)
- A history of migraine, other persistent pain conditions, or heightened pain sensitivity
- Psychological stress and poor sleep (can amplify nervous system sensitivity, even though they are not the “cause”)
Symptoms
- Severe, burning, aching, or stabbing pain that feels disproportionate to the original injury
- Pain from light touch, clothing, bedding, water, or wind (allodynia)
- Swelling in the hand, foot, or affected part of the limb
- Temperature differences compared with the other side (warmer or cooler)
- Colour changes (red, purple, pale, blotchy)
- Sweating changes or sweating asymmetry
- Stiffness and loss of range of motion
- Skin, hair, or nail changes (shiny skin, altered hair growth, brittle nails)
- Feeling “disconnected” from the limb, neglect-like symptoms, or body-perception changes
- Weakness, tremor and altered coordination
Aggravating Factors
- Keeping the limb still or avoiding movement due to fear of pain
- Prolonged immobilisation after fracture or surgery (for example, long time in a cast or sling without graded rehab)
- Sudden increases in activity, lifting, or walking load without pacing (boom-bust cycles)
- Touch, pressure, vibration, or temperature extremes on the affected area
- High stress, poor sleep, or flare-ups of anxiety around movement and pain
- Tight jewellery, compressive clothing, or poorly tolerated splints/casts
Causes
CRPS usually starts after an identifiable trigger/tissue trauma such as a fracture, sprain, surgery, crush injury, or sometimes a period of prolonged immobilisation. It has also been reported to occur in cases without an identifiable trigger. In CRPS Type 2, there is a known nerve injury. The exact cause is not one single problem. CRPS is best understood as a mix of processes that can overlap, including:
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Peripheral sensitisation: local nerves in the limb become irritable and over-respond to stimulation.
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Autonomic and inflammatory changes: the body’s regulation of blood flow, sweating, and swelling can become disrupted, contributing to temperature and colour changes.
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Central sensitisation: the spinal cord and brain amplify danger signals, so pain becomes easier to trigger and harder to switch off.
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Body-perception and motor control changes: the brain’s “map” of the limb can become blurred, contributing to clumsiness, weakness, guarding, and the sense that the limb does not feel like it belongs.
This is why CRPS treatment and CRPS rehab need to address both the limb and the nervous system. Physiotherapy for CRPS is not about forcing painful movement. It is about carefully reintroducing safe input (movement, touch, load, function) so the system learns the limb is not in danger.
How Is It Diagnosed?
CRPS is diagnosed clinically, meaning it is based on your story and a careful physical examination rather than one definitive scan or blood test.
Many clinicians use the Budapest criteria which is a useful tool for diagnosis. The Budapest criteria looks for disproportionate ongoing pain plus a pattern of symptoms and signs across four domains:
- Sensory (extra sensitive – pain with light touch)
- Vasomotor (temperature/colour)
- Sudomotor/oedema (sweating/swelling)
- Motor/trophic (movement and tissue changes)
Importantly, the diagnosis also requires that no other condition better explains the presentation.
A physiotherapist can contribute significantly to diagnosis by documenting functional changes (strength, movement, coordination), mapping sensitivity (touch, pressure, temperature), observing swelling/colour/temperature changes over time, and identifying movement patterns like guarding and fear of use. Physios also help identify “look-alike” problems that can mimic CRPS, such as nerve entrapment, infection, inflammatory arthritis, vascular problems, compartment syndrome or deep vein thrombosis.
Investigations & Imaging
- X-ray
- May show patchy bone demineralisation (osteopenia) in longer-standing CRPS, and helps exclude fracture complications.
- Ultrasound
- Can reveal underlying nerve and tissue damage.
- MRI
- May show bone and bone marrow abnormalities to help localise the CRPS affected limb.
- Triple-phase bone scans
- Can also show bone-related changes and is sometimes used to support the overall assessment or rule out other causes.
Grading / Classification
- CRPS Type 1
- CRPS features without an identifiable major nerve injury; often follows fracture, sprain, or surgery.
- CRPS Type 2
- Same clinical pattern as CRPS, but occurs after a confirmed nerve injury.
- Warm pattern (often earlier)
- Limb may be redder, warmer, more swollen, and more inflamed in appearance, often with marked sensitivity.
- Cold pattern (often later)
- Limb may be cooler, dusky or bluish, sweaty, and stiffer with more prominent movement limitation and tissue changes.
Physiotherapy Management
Physiotherapy for CRPS focuses on calming an overprotective nervous system while steadily restoring normal use of the affected limb. CRPS can make touch, movement, and temperature feel threatening, so rehab needs to be gentle, consistent, and gradually progressed rather than forced. Your physiotherapist will aim to reduce sensitivity, improve circulation and swelling, restore movement and strength, and rebuild confidence in the limb through carefully graded activity.
CRPS rehab is usually based on a few key ideas: keep the limb involved in daily life (without overdoing it), retrain the brain and nerves with safe input, and prevent the secondary problems that come from guarding, like stiffness, weakness, and loss of function. Sessions often combine hands-on strategies to help you tolerate movement, targeted education about flare-ups and pacing, and a personalised home program. Because CRPS affects the whole system, physiotherapists often work alongside doctors, pain specialists, psychologists and occupational therapist to support return to work, sport, or normal routines.
Progress is usually measured in what you can do, not just how much it hurts. Your physiotherapist will help you find a starting level you can repeat most days, then build in small steps so you can improve without triggering big flare-ups.
Exercise
CRPS physiotherapy exercises are about rebuilding confidence and capacity without triggering major flare-ups. Your physiotherapist will usually start with movements that your nervous system can tolerate and then progress gradually. This may begin with gentle range-of-motion work, tendon glides for hands, ankle mobility for feet, and short, frequent sessions rather than one big effort. Strengthening is introduced in a paced way, often starting with isometrics (tensing without moving much), then controlled functional strengthening, and eventually work or sport-specific tasks. Aerobic exercise can also help calm the nervous system and improve overall pain modulation, so your physiotherapist may add cycling, walking in intervals, or pool-based work if tolerated. The goal is not to “push through” CRPS pain, but to teach the system that movement is safe again.
Activity Modification
CRPS rehab often fails when people swing between doing nothing on bad days and doing far too much on good days – we often refer to this as the boom and bust cycle. A physiotherapist will help you find a baseline you can repeat daily, then build by small steps. This might include pacing strategies, micro-breaks, and changing how you do tasks so the limb stays involved without overload. If your CRPS affects the hand, this could mean graded exposure to typing, gripping, and daily tasks (cutlery, grooming, light carrying). If it affects the foot, it may involve graded weight-bearing, step counts, and footwear strategies. The plan should always include meaningful activities, because function is one of the best “inputs” for retraining the system.
Manual Therapy
Hands-on physiotherapy for CRPS is usually gentle and purposeful. Early on, firm techniques can be too threatening for a sensitised system, so your physiotherapist may use light touch approaches that double as desensitisation, soft tissue techniques to ease guarding, and careful joint mobilisations to restore motion when stiffness is limiting function. Manual therapy is not a stand-alone fix for CRPS, but it can help create a window where movement feels more possible, so you can then practise active rehab.
Postural Retraining
Posture is not the cause of CRPS, but protective patterns can load other areas and reinforce guarding. For upper limb CRPS, shoulder girdle stiffness and protective rounding can increase neck and shoulder discomfort and further reduce arm use. A physiotherapist may work on thoracic mobility, scapular control, and comfortable positions for the arm so the limb can rejoin daily tasks. For lower limb CRPS, altered gait can overload the hip and back, so gait retraining and graded walking mechanics can be important parts of CRPS rehabilitation.
Bracing & Taping
Bracing is used cautiously in CRPS. Over-bracing can increase fear and reduce normal input to the limb. When used, it is typically short-term and goal-based, such as a removable wrist support that allows graded use, or taping to support swelling management while still encouraging movement. Your physiotherapist will monitor whether a brace is helping function or accidentally increasing protection and sensitivity.
Heat & Ice
Temperature strategies are very individual in CRPS. Some people find gentle warmth helps stiffness and movement, while others find heat aggravates swelling or burning pain. Ice can be poorly tolerated when the nervous system is hypersensitive. A physiotherapist can help you trial safe options, often focusing more on graded exposure to normal temperature sensations rather than relying on aggressive hot or cold treatments.
Education
Education is a major part of physiotherapy for Complex Regional Pain Syndrome. Understanding that CRPS pain reflects an overprotective nervous system can reduce fear and help you re-engage with movement. A physiotherapist will usually explain flare-ups, pacing, sleep links, stress responses, and why consistent, graded input is more effective than rest alone. Education also includes practical strategies like skin care, swelling management, and how to communicate your needs at work, school, or with family.
Other
Many physios include nervous system retraining approaches within CRPS rehab, depending on your presentation. This can include desensitisation programs (graded textures, vibration, water exposure), laterality training (left-right discrimination), imagined movements, and mirror therapy or graded motor imagery where appropriate. These are aimed at improving body perception and reducing threat responses linked to the limb. A physiotherapist may also coordinate with an occupational therapist for hand function, daily task modification, and return-to-work planning, and may recommend psychology input for pain management skills as part of a multidisciplinary approach.
Other Treatments
CRPS treatment is often multidisciplinary. Depending on severity and access, this may include:
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Medication management (for neuropathic pain, sleep, or inflammation as guided by a doctor).
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Pain interventions (such as sympathetic blocks) in selected cases, usually through a pain specialist.
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Psychological strategies (pain-focused cognitive behavioural therapy, acceptance-based approaches, or trauma-informed care) to reduce fear, improve coping, and support graded re-engagement with life.
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Occupational therapy for upper limb function, daily task retraining, splint advice where appropriate, and return-to-work planning.
These supports work best when they feed directly into active CRPS physiotherapy and functional rehabilitation, rather than replacing it.
Surgery
Surgery is not a routine treatment for CRPS itself. If CRPS developed after a fracture or operation, surgeons may need to address a clear mechanical problem (for example, unstable hardware, ongoing compression, or a complication that is driving pain), but surgery can also risk worsening sensitisation if performed without a strong indication.
In persistent, severe cases managed by a specialist pain service, some procedures are considered “surgical” in the broader sense, such as implanted neuromodulation devices (for example, spinal cord stimulation or dorsal root ganglion stimulation). These are not first-line options and are usually considered after a structured CRPS rehab program with physiotherapy, medication optimisation, and multidisciplinary care. If these are pursued, physiotherapy remains essential pre- and post-procedure to keep restoring function and prevent the limb from becoming more guarded.
Prognosis & Return to Activity
CRPS has a variable course. Some people improve significantly within months, particularly when the condition is recognised early and rehab begins promptly. Others experience longer-lasting symptoms and may need extended support. In general, outcomes are better when the affected limb stays involved in life through graded, consistent use, rather than avoidance.
Return to work, sport, or usual routines should be treated like a training plan. Your physiotherapist can set activity targets (time, steps, lifts, task exposure), build tolerance gradually, and plan flare-up strategies so setbacks do not become stop-start cycles. A successful return is usually based on function and confidence, not on waiting for pain to be completely gone.
Complications
- Persistent pain with long-term movement limitation, weakness, and reduced function
- Joint stiffness, contractures, and reduced fine motor control (especially in hand CRPS)
- Reduced bone density in the affected limb due to disuse
- Sleep disturbance, fatigue, anxiety, low mood, and reduced participation in work or social life
- Spread of symptoms regionally or to another limb (not common, but can occur)
Preventing Recurrence
- After a fracture or surgery, work with a physiotherapist on early, safe movement and graded loading to reduce prolonged immobilisation and disuse of the limb.
- Keep swelling controlled while still moving the limb: elevate when needed, use gentle muscle pumping exercises, and follow physio guidance so swelling strategies do not become “rest-only” strategies.
- Avoid boom-bust activity cycles: use pacing so the limb gets consistent daily input without large flare-ups that reinforce fear and guarding.
- If pain, sensitivity, swelling, or colour/temperature changes seem disproportionate in the weeks after injury, seek early assessment so CRPS rehab can start promptly.
When to See a Physio
- Pain is escalating or feels out of proportion to the original injury, especially if it persists beyond expected tissue healing timeframes
- You notice swelling, colour change, temperature change, sweating changes, or increasing sensitivity in the limb
- Movement is reducing because the limb feels too painful, “unsafe”, or extremely sensitive to touch
- You are avoiding weight-bearing, gripping, or normal use and function is declining week to week
- You want a structured CRPS rehabilitation plan that includes pacing, desensitisation, and graded return to work or sport