Complex Regional Pain Syndrome Crps

Overview

Complex Regional Pain Syndrome — usually just called CRPS — is a long-lasting pain condition that most often affects one arm, hand, leg or foot. It usually starts after an injury, an operation, a stroke or even a small bump, but the pain is far stronger and lasts far longer than you would expect for that injury. In CRPS the nerves, the immune system and the blood vessels in the affected limb become over-sensitive and stay 'switched on'. This causes pain, changes in skin colour and temperature, swelling and stiffness. CRPS is a real physical condition, not something you are imagining, and it is not a sign of weakness.

CRPS is uncommon, though not extremely rare. Exact numbers are hard to pin down because it is often under-recognised, and studies give widely different figures. It is seen most often after wrist fractures and after certain operations, but it can happen after any injury — or, less often, with no clear trigger at all.

CRPS can affect anyone at any age, including children and teenagers. It is more common in adults than in young children, and more common in women than in men. It can follow fractures, sprains, surgery, a stroke, a period of being unable to move a limb, or sometimes a very minor injury. Some people develop it without any remembered injury.

Symptoms

Common symptoms

• Burning, throbbing, shooting or stabbing pain that is much worse than expected for the original injury, and that continues after the injury has healed.
• Extreme sensitivity: light touch, clothing, a bedsheet or a cool breeze can cause real pain (doctors call this allodynia).
• Swelling in the affected limb that does not settle as expected.
• Skin colour changes — the limb may look red, blue, purple, pale or blotchy.
• The limb feeling warmer or cooler than the other side.
• Changes in sweating — the skin may be unusually sweaty or unusually dry.
• Skin changes such as shiny, thin, dry or thickened skin.
• Hair and nail changes — hair may grow faster than usual or fall out, and nails may become ridged or brittle.
• Stiffness, reduced movement, trembling, jerking or muscle spasms in the limb.
• A strange feeling that the limb does not quite belong to you, or that it looks a different size than it really is.
• Pain or discomfort that spreads up or down the limb, and sometimes to another limb.
• Sleep problems, low mood and anxiety, which often come along with long-term pain.

Symptoms in children

• In children and teenagers, CRPS more often affects a leg than an arm.
• Younger people may describe the limb feeling 'odd', 'not mine' or 'heavy' rather than describing burning pain.
• Children may simply avoid using the limb, limp, or stop taking part in sport and school activities.
• The good news is that children and teenagers often respond well to treatment and are more likely than adults to improve fully, especially with early physiotherapy and support.

Symptoms in older adults

• In older adults, CRPS often follows a fracture, joint surgery or a stroke, and may be mistaken at first for poor circulation, arthritis or simply 'slow healing'.
• Swelling and stiffness may be put down to age or to the original injury, so the diagnosis can be delayed.
• Reduced movement and pain can raise the risk of falls, so balance and safety at home are worth discussing with your doctor or physiotherapist.
• Older skin is more fragile, so protecting the limb from scrapes and pressure sores matters more.

Causes

Main causes

• CRPS is not fully understood. It seems to happen when the body's pain and healing systems do not switch off properly after an injury.
• The nerves in the affected area become over-sensitive and send pain signals even when there is no new damage.
• The immune system and the small blood vessels in the limb behave abnormally, which explains the swelling, colour and temperature changes.
• Changes in the way the brain processes signals from the limb may make it feel strange, swollen or 'not quite yours'.
• It can be triggered by a fracture, sprain, burn, cut, injection, operation, or a stroke — and sometimes by something as small as a knock that you barely noticed.

Risk factors

• A previous injury, especially a wrist fracture or a badly sprained ankle.
• Recent surgery, particularly on a hand, wrist, knee or foot.
• A stroke or any illness that leaves a limb immobile for a while.
• Long periods of not moving a limb, for example while in a cast or sling.
• Being female — CRPS is more common in women.
• Having CRPS before, which slightly raises the chance of it happening again in another limb.
• High levels of pain and stress around the time of an injury may play a part, though this is still being studied.

When to see a doctor

See a doctor urgently if:

• Pain that is far worse than expected for your injury, or that is getting worse instead of better.
• New redness, heat and swelling in the limb, especially with a fever.
• A limb that changes colour, feels very cold, or goes numb or weak.
• You cannot move the limb at all, or the skin is breaking down.

Book a routine appointment if:

• Pain that has lasted longer than expected after an injury or operation.
• Swelling that will not settle, or skin that has changed colour, temperature or texture.
• Everyday touch — clothes, water, a bedsheet — becoming painful.
• Stiffness or trembling in a limb that is getting in the way of daily life.
• Sleep, mood, work or school being affected by ongoing pain.
• You feel something is not right, even if tests have been normal so far — it is always reasonable to ask for a second opinion.

Diagnosis

There is no single test for CRPS. A doctor makes the diagnosis by listening to your story, examining the limb and checking whether your symptoms fit a set of agreed international criteria (often called the Budapest criteria). These look for pain that is out of proportion, plus changes in sensation, colour, temperature, sweating and swelling or movement. Because symptoms can come and go, you may need more than one appointment, and you may be referred to a pain specialist or a physiotherapist with experience in CRPS.

Tests that may be done

• A careful physical examination, comparing the affected limb with the other side.
• Blood tests to look for infection, inflammation or other conditions.
• X-rays to check for bone problems or healing fractures.
• An MRI scan, which can show changes in the tissues or rule out other causes.
• A bone scan, which sometimes shows a typical pattern in CRPS but is not used alone to diagnose it.
• Nerve tests (nerve conduction studies) if a nerve injury is suspected.
• Thermal imaging or measurement of skin temperature, used in some specialist clinics.
• A response to a nerve block, which can sometimes support the diagnosis.

What to expect at your appointment

Getting a diagnosis can take time, and it is common to have several appointments and tests first — this is to make sure nothing else is going on, not because your pain is not believed. Keeping a simple diary of your symptoms, taking photos of colour or swelling changes, and noting what makes the pain better or worse will all help. Ask your doctor to explain what they are ruling out at each stage, and feel free to bring someone with you to appointments.

Treatment

Treatment works best when it starts early and combines several approaches. The aim is to reduce pain, keep the limb moving, protect the skin and joints, and help you get back to the things you enjoy. A team — often a GP, physiotherapist, occupational therapist, pain specialist and sometimes a psychologist — works together with you. There is no single 'cure', but many people make very good progress.

Self-care at home

• Keep moving gently. Even small, regular movements of the affected limb help stop stiffness and keep the joints healthy.
• Pace yourself: do a little and often, rather than a lot at once, and rest before you get exhausted.
• Try gentle 'desensitisation' — touching the limb with different textures such as a soft cloth, cotton wool or a dry flannel, starting very gently and building up over weeks.
• Keep the limb warm and protected from knocks, and check the skin regularly for cuts, blisters or pressure marks.
• Use relaxation, breathing exercises, distraction and good sleep habits to help your body cope with pain.
• Stop smoking if you smoke — smoking narrows blood vessels and can make circulation problems worse.
• Keep a diary of what helps and what flares things up; it makes appointments far more useful.
• Ask your pharmacist before using any over-the-counter creams, rubs or pain relievers on the affected limb.

Medical treatments

Treatment is tailored to you. Physical therapy is the cornerstone — physiotherapists and occupational therapists use graded movement, mirror therapy and graded motor imagery to gently retrain the way the brain and limb communicate. Doctors may prescribe pain medicines from several different classes, including medicines designed for nerve pain, and sometimes medicated creams or patches; your prescriber will explain the options and their side effects. Specialist pain clinics can offer nerve blocks or injections, special types of nerve stimulation, and pain management programmes that combine physical and psychological techniques. Talking therapies such as cognitive behavioural therapy can help with the distress and disruption that long-term pain brings. Because everyone responds differently, treatment is usually adjusted over time, and you should always discuss any changes with your healthcare team rather than stopping or starting anything alone.

When is surgery considered?

Surgery is rarely part of CRPS treatment. Occasionally, if a specific nerve has been clearly injured and is causing the problem, a specialist may discuss an operation to treat that nerve. Implanted nerve-stimulating devices are sometimes offered in specialist centres for people who have not responded to other treatments. Amputation is very rarely considered and only in extreme cases, because CRPS can sometimes return in the remaining limb. Any decision like this should be made slowly with a specialist team you trust.

Living with this condition

Living with CRPS can be tiring and frustrating, especially in the early months. The key is to build a steady, gentle routine rather than pushing through pain or giving in to it completely. Small daily movements, good sleep, and staying connected with people you trust all make a real difference. It also helps to explain CRPS to family, friends and, if relevant, your workplace or school, so they understand that the pain is real and that you may need to do things differently for a while.

Lifestyle tips

• Set small, realistic goals each week rather than aiming for big leaps.
• Break activities into short bursts with rests in between.
• Keep a regular sleep routine and wind down before bed.
• Stay connected — loneliness makes pain harder to cope with.
• Avoid very hot or very cold exposure to the limb if it makes symptoms flare.
• Ask your employer, school or college about adjustments such as flexible hours or a different workspace.
• Consider gentle, enjoyable movement like swimming, walking or tai chi, adapted to what your limb can manage.

Diet and exercise

There is no special diet that cures CRPS, but eating regular, balanced meals supports healing and energy levels. Gentle exercise is important — the aim is to keep joints and muscles working without provoking a flare. A physiotherapist can help you design a safe programme, often starting with small movements in warm water or with the limb supported. Build up very gradually, and expect good days and harder days; that pattern is normal.

Mental health and emotional wellbeing

Long-term pain affects mood, sleep and confidence, and it is completely understandable to feel anxious, low or frustrated. This is not a sign of weakness, and it is not the cause of CRPS. Talking to a GP, a psychologist or a pain management programme can help a lot, and many people find peer support groups valuable. If you ever have thoughts of harming yourself or feel you cannot cope, please reach out for urgent help straight away — you deserve support, and you are not alone.

Prevention

CRPS cannot always be prevented, and it is not your fault if it happens. The best-known protective steps are to get a limb moving again as soon as it is safe after an injury, to follow your rehabilitation advice, and to tell your doctor early if the pain seems much worse than expected. Some research has looked at whether certain supplements reduce the risk after a wrist fracture; the evidence is mixed, so ask your own doctor whether anything applies to your situation rather than starting anything yourself.

Vaccines

There is no vaccine for CRPS.

Screening programmes

There is no routine screening test for CRPS. The best approach is simply to mention symptoms early to your doctor or physiotherapist.

Complications

If left untreated

• Stiffness and loss of movement in the affected joint, which can become hard to reverse.
• Muscle wasting and weakness from not using the limb.
• Spread of symptoms to another limb, which happens in some people.
• Skin problems and, rarely, long-standing skin changes.
• Disrupted sleep, low mood, anxiety and exhaustion.
• Difficulties with work, study, money and relationships.
• Loss of confidence and reduced independence, especially for older adults.

Long-term outlook

The outlook varies. Some people recover fully, others improve a great deal over months or years, and some live with ongoing pain that needs managing. Early treatment gives the best chance of improvement, and children and teenagers in particular often do very well. Even when CRPS lasts, most people find ways to get back to a meaningful life with the right support, pacing and pain management. It is worth asking for help early and sticking with a team you trust.

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