RSD and Ehlers-Danlos syndrome: comorbidities and pain management

Reflex sympathetic dystrophy (RSD), now generally called complex regional pain syndrome (CRPS), and Ehlers-Danlos syndrome (EDS) can occur together, complicating both diagnosis and care. CRPS usually affects one body region and may cause pain out of proportion to the initiating event, extreme sensitivity, swelling, and changes in skin colour, temperature, sweating or movement. EDS is a group of inherited connective-tissue disorders that may involve hypermobility, fragile skin, joint instability and autonomic symptoms.

Neither condition should be assumed to explain every symptom when both are present. The practical goal is to identify which symptoms reflect nerve sensitisation, tissue fragility, joint instability, deconditioning or an unrelated illness, then combine suitable treatments. This information is general and cannot replace an individual assessment by clinicians familiar with complex pain and hypermobility.

Understanding the conditions

CRPS is a regional pain condition involving abnormal sensory, autonomic and motor responses. Allodynia means normally harmless contact hurts; hyperalgesia means painful stimuli feel more intense. Muscle spasms, weakness, dystonia, swelling and tender or shiny skin can accompany them. These signs help distinguish CRPS from ordinary pain after an injury.

EDS and CRPS can share fatigue, poor sleep, dizziness, gastrointestinal symptoms and reduced endurance. Joint laxity can alter gait and loading, potentially increasing mechanical stress on a sensitive limb, while autonomic dysfunction may affect heart rate, blood pressure and temperature regulation. Shared features do not prove either diagnosis, and some symptoms may arise from medication, deconditioning or another condition.

Diagnosis and clinical pathways

CRPS is usually diagnosed clinically using the Budapest criteria, which assess continuing disproportionate pain, sensory sensitivity, vasomotor and sudomotor changes, and motor dysfunction. There is no single scan or blood test that confirms it. Clinicians also exclude arthritis, infection, thrombosis, nerve compression and other causes. A newly hot, swollen, pale or blue limb with fever needs prompt assessment rather than being labelled CRPS.

EDS assessment depends on the subtype. In hypermobile EDS, diagnosis is largely clinical; genetic testing may identify other forms of EDS or related conditions, but a negative result does not exclude hypermobile EDS. A rheumatologist may coordinate joint, cardiovascular, skin, gastrointestinal and autonomic assessments. Teams should consider whether pain is regional, widespread or changing and whether joint instability needs separate treatment.

In Australia, a GP often coordinates care and can refer to rheumatology, neurology, rehabilitation and pain services. Medicare rebates for specialist consultations generally require a valid referral; public hospitals may offer multidisciplinary care, but waiting times can be long, and private clinics may charge gaps. Multidisciplinary pain clinics in Melbourne, Sydney and Brisbane can combine medicine, physiotherapy, psychology and rehabilitation, although access and private costs vary.

Causes and pain mechanisms

The causes are not fully understood. CRPS may follow fracture, surgery, immobilisation or another illness, and sometimes begins without an obvious trigger. Research implicates altered nerve signalling, inflammation and autonomic regulation rather than one damaged nerve. EDS results from inherited changes in connective tissue, while the cause of hypermobile EDS is often not identifiable in current testing.

Pain perception can also be shaped by sleep, stress, movement, fear and prior experiences. The comparison between phantom pain and RSD may help distinguish sensations arising from a missing or altered neural map from CRPS, but it does not replace diagnosis. Having EDS does not guarantee CRPS, and vice versa. New neurological deficits, persistent swelling or a sudden change in symptoms should be reassessed for another cause.

Multidisciplinary treatment and rehabilitation

Treatment is individualised and multidisciplinary, with early coordinated care often more useful than switching between isolated therapies. Some people also draw on crystal-based spiritual support during reflection or prayer. Crystals have not been shown to treat CRPS or EDS and should not replace evidence-based care or rehabilitation.

A clinician-led plan may include:

Physiotherapy and occupational therapy that gradually restore movement while respecting CRPS sensitivity and EDS joint laxity.
Medicines tailored to pain type; paracetamol or anti-inflammatories may help when safe, while neuropathic medicines are sometimes considered.
Psychological support such as acceptance and commitment therapy or CBT to reduce fear-driven avoidance and improve coping, without implying the pain is imaginary.
Opioids, which are generally not a routine long-term solution because evidence of benefit is limited and harms can be substantial.
Selected procedures such as sympathetic nerve blocks or spinal-cord stimulators that may be discussed after specialist review, although suitability and evidence vary.
A written flare plan covering pacing, sleep, activity changes and clinical contacts.

Everyday measures that support rehabilitation include:

Keeping a diary of pain, swelling, sleep, activity and possible triggers.
Using paced activity and energy conservation instead of pushing through escalating symptoms.
Choosing low-impact movement, strengthening supporting muscles and seeking help before a familiar joint or limb becomes persistently painful.
Protecting sensitive skin and avoiding tight clothing, repeated minor injuries or extreme temperatures over an affected area.
Reviewing prescriptions and over-the-counter medicines with a GP and Australian pharmacist, and avoiding abrupt changes.

Rehabilitation is central, but it must not involve forcing painful movement or repeatedly provoking a sensitised limb. Flare-ups are common, and an agreed plan can distinguish an expected temporary increase from a new injury, infection or vascular problem. Sudden severe pain, a hot swollen limb, fever, chest pain or breathlessness needs prompt medical assessment rather than being labelled a routine CRPS flare.

Daily life, relationships and support

Chronic pain can affect mood, identity, work, finances and relationships, while movement restrictions may create social isolation. Anxiety, depression and fear of activity are common responses to persistent symptoms; they do not mean the pain is psychological or imaginary. Practical support may include workplace adjustments, accessible transport and pacing plans that preserve social contact.

Pain education can reduce the fear that accompanies movement, especially when family members interpret reduced activity as laziness. Clear explanations of allodynia, autonomic changes and flare patterns can make accommodations more likely. Peer-support groups and chronic-pain psychologists can help with isolation, workplace negotiation and rebuilding confidence at a sustainable pace.

Family members and friends can struggle with an illness whose severity changes and whose visible signs may be absent. Using explaining RSD to others can provide practical language for describing pain, sensitivity and limitations. Agreeing on what help looks like and respecting privacy are especially valuable when fatigue flares or appointments are difficult.

If symptoms are new, worsening or affecting daily function, arrange an appointment with a GP and ask for coordinated pain and hypermobility assessment. Bring a symptom timeline, medication list and records of relevant injuries or family diagnoses so the plan can distinguish CRPS, EDS complications and other treatable causes.