What Is Complex Regional Pain Syndrome (CRPS)? Causes, Symptoms & Treatment

What Is Complex Regional Pain Syndrome?

Complex regional pain syndrome (CRPS) is a chronic pain condition that causes severe, prolonged pain — typically in an arm, leg, hand, or foot — that is disproportionate to the original injury that triggered it. The pain is often described as burning, stabbing, or electric, and it can be so intense that even a light breeze or the touch of clothing becomes excruciating.

CRPS is classified into two types. CRPS Type I (formerly called Reflex Sympathetic Dystrophy or RSD) occurs without confirmed nerve damage — it often follows an injury such as a fracture, sprain, or surgery. CRPS Type II (formerly known as causalgia) involves confirmed damage to a peripheral nerve. Despite the distinction, both types share the same hallmark symptoms: burning pain, hypersensitivity, swelling, skin color and temperature changes, and motor dysfunction.

At The Bridge Health Recovery Center in New Harmony, Utah, Dr. Daren Brooks, D.O. and our multidisciplinary team have worked with hundreds of guests living with CRPS. What we've seen repeatedly is that standard medical approaches — nerve blocks, medications, physical therapy — provide partial or temporary relief at best. The reason? They target the symptoms without addressing the underlying nervous system dysregulation that drives CRPS.

Recognizing CRPS Symptoms: More Than Just Pain

CRPS symptoms are wide-ranging and can evolve over time, making diagnosis challenging. If you suspect you or a loved one may have complex regional pain syndrome, here are the key symptoms to watch for:

• Burning or throbbing pain — Often continuous and significantly more intense than expected from the original injury.
• Allodynia — Pain from stimuli that wouldn't normally be painful, such as a light touch, clothing, or cool air.
• Hyperalgesia — Exaggerated pain response to stimuli that would normally cause only mild discomfort.
• Skin changes — The affected area may appear red, purple, or pale and may shift between these colors unpredictably.
• Temperature changes — The skin may feel hot or cold to the touch, sometimes alternating between the two.
• Swelling and stiffness — Swelling in the affected limb, along with joint stiffness and limited range of motion.
• Sweating changes — Either excessive sweating or absence of sweating in the affected region.
• Muscle weakness or tremors — Difficulty moving the affected limb, involuntary spasms, or muscle atrophy in chronic cases.
• Hair and nail changes — Unusually rapid or slowed hair and nail growth in the affected area.

These symptoms are driven by a nervous system that has become locked in an abnormal pain-signaling loop — and understanding that is the key to treatment. "CRPS is not just a pain condition," explains Dr. Brooks. "It's a nervous system condition where the brain and body have lost the ability to turn the pain signal off."

"CRPS is not just a pain condition — it's a nervous system condition where the brain and body have lost the ability to turn the pain signal off." — Dr. Daren Brooks, D.O.

What Causes Complex Regional Pain Syndrome?

The exact cause of CRPS is not fully understood, but research points to a combination of nervous system malfunction, immune system involvement, and psychological factors — particularly unresolved trauma. In most cases, CRPS develops after an injury, surgery, stroke, or heart attack. However, the injury itself is often minor relative to the pain that follows.

Current research suggests several overlapping mechanisms:

• Peripheral sensitization — Nerve endings in the affected area become hypersensitive, firing pain signals continuously even when no new injury is occurring.
• Central sensitization — The spinal cord and brain undergo changes that amplify pain signals across the entire nervous system, a process also seen in fibromyalgia and chronic fatigue syndrome.
• Sympathetic nervous system dysregulation — The autonomic nervous system, which controls involuntary functions like blood flow and sweating, becomes dysregulated and contributes to the skin changes, temperature fluctuations, and swelling characteristic of CRPS.
• Neuroinflammation — Inflammatory processes in the nervous system perpetuate the pain cycle.
• Psychological and trauma factors — Studies show that unresolved emotional trauma, chronic stress, and anxiety significantly increase the risk of CRPS development and severity. At The Bridge, we consistently find that trauma history plays a central role in nervous system dysregulation.

This multifactorial nature of CRPS is precisely why single-modality treatments so often fail. A nerve block may temporarily reduce pain signals, but if the underlying nervous system and trauma remain unaddressed, the pain returns — often worse than before.

The Three Stages of CRPS: How the Condition Evolves

CRPS often (though not always) progresses through three stages. Understanding where you are in this progression can help shape treatment decisions:

Stage 1: Acute (0–3 months)

This stage is characterized by burning pain, swelling, and skin changes in the affected area. The skin may appear red and feel warm. Movement is painful, and many patients notice excessive sweating. Hair and nail growth may increase. At this stage, early and aggressive intervention — particularly nervous system–focused treatment — offers the best chance of preventing progression.

Stage 2: Dystrophic (3–12 months)

Pain intensifies and becomes more constant. The skin may shift from warm to cool, and swelling may harden. Muscle weakness and stiffness increase. Hair and nail growth may slow. The nervous system is becoming more entrenched in its dysregulated state, and standard treatments often show diminishing returns.

Stage 3: Atrophic (12+ months)

In this advanced stage, the affected limb may show muscle atrophy, significant loss of motion, and chronic skin changes. Pain may spread beyond the original site. This is where many patients find themselves after years of inadequate treatment — but even at this stage, nervous system healing is possible. Our team at The Bridge has seen remarkable progress in long-term CRPS patients who had nearly given up hope.

How Is CRPS Diagnosed?

There is no single test for CRPS. Diagnosis is clinical — meaning it is based on the pattern of symptoms, patient history, and ruling out other conditions. The most widely used diagnostic criteria are the Budapest Criteria, developed by an international group of pain specialists.

Under the Budapest Criteria, a CRPS diagnosis requires:

• Continuing pain disproportionate to any inciting event
• Patient reports of at least one symptom in three of four categories: sensory, vasomotor, sudomotor/edema, motor/trophic
• Clinical findings in at least two of four categories at the time of evaluation
• No other diagnosis that would better explain the symptoms

Imaging studies such as bone scans, X-rays, or MRIs may be ordered to rule out other conditions and assess bone changes. Thermography (skin temperature measurement) and quantitative sensory testing can also support a CRPS diagnosis. Many patients spend years pursuing a correct diagnosis — the average CRPS patient sees multiple specialists before getting answers.

If you've been told your pain is "all in your head" or that nothing more can be done, The Bridge team understands your frustration. CRPS is real, measurable, and treatable when the right approach is taken.

CRPS Treatment: What Actually Works

Conventional CRPS treatment typically includes a combination of medications (anticonvulsants, antidepressants, opioids), physical therapy, nerve blocks, spinal cord stimulation, and psychological support. While these interventions can provide relief, they frequently fall short of lasting recovery — particularly because they don't address the nervous system dysregulation at the root of CRPS.

The most effective approaches for CRPS treatment combine multiple modalities targeting the nervous system at multiple levels:

• Nervous system retraining — Techniques that teach the brain to reinterpret pain signals, reducing central sensitization. This includes graded motor imagery, mirror therapy, and pain reprocessing therapy.
• Somatic trauma work — Addressing the stored trauma in the body that perpetuates nervous system dysregulation. Somatic experiencing, EMDR-informed body-based approaches, and other trauma therapies can significantly reduce CRPS severity.
• Vagus nerve stimulation and breathing practices — Activating the parasympathetic nervous system to shift out of chronic sympathetic overdrive.
• Anti-inflammatory nutrition — Reducing neuroinflammation through dietary changes, targeted supplementation, and gut health optimization.
• Mindfulness and cognitive approaches — Reducing the fear-avoidance cycle and catastrophizing that amplify CRPS pain.
• Gentle movement and desensitization — Carefully graduated physical activity to retrain the nervous system's response to movement.
• Sleep optimization — Addressing the sleep disruption that is both a symptom and a driver of CRPS severity.

At The Bridge, our 21-day immersive program integrates all of these approaches in a concentrated healing environment — far removed from the stressors that keep the nervous system locked in fight-or-flight. For many guests, this immersive model produces results in weeks that years of outpatient treatment could not achieve.

The Nervous System Root Cause of CRPS

Perhaps the most important — and most underappreciated — insight about CRPS is that it is fundamentally a nervous system disorder. The pain, the hypersensitivity, the autonomic changes: all of these emerge from a nervous system that has become stuck in a state of chronic dysregulation.

Dr. Brooks explains it this way: after an injury or trauma, the nervous system is supposed to activate a protective pain response and then — once the threat has passed — return to baseline. In CRPS, that return to baseline never happens. The nervous system remains locked in a hypersensitive, hyperactivated state, continuing to generate and amplify pain signals long after any tissue injury has healed.

This is closely related to what happens in other nervous system–driven conditions: fibromyalgia, chronic fatigue syndrome, treatment-resistant depression, and PTSD. Many CRPS patients have multiple overlapping diagnoses — which makes sense, because they share a common nervous system dysregulation pathway.

The key insight that drives our approach at The Bridge: if the nervous system got stuck in this dysregulated state, it can also be guided back out of it. The brain is neuroplastic — it can learn new patterns, including new pain patterns. With the right tools, environment, and support, genuine recovery is possible.

How The Bridge Approaches CRPS Recovery

The Bridge Health Recovery Center was founded specifically to address the gap between what conventional medicine offers and what people with conditions like CRPS actually need. Located in the serene landscape of New Harmony, Utah — near the red rock canyons of Southern Utah — The Bridge provides a 21-day immersive healing experience that addresses CRPS at its nervous system root.

Our CRPS program integrates:

• Comprehensive nervous system assessment — Understanding where and how your nervous system has become dysregulated, and what specific factors are driving your CRPS.
• Trauma-informed care — Many CRPS patients have a trauma history that has never been properly addressed. Our team includes practitioners trained in somatic trauma approaches that can safely process this underlying material.
• Individualized daily protocols — Each guest receives a personalized program combining therapeutic modalities, movement, nutrition, and mindfulness practices tailored to their specific presentation.
• Nature immersion — The stunning landscape of Southern Utah is therapeutic in itself. Daily hikes, time in nature, and the removal from chronic stressors support nervous system recovery in ways that clinical settings cannot replicate.
• Peer community — Healing alongside others who understand chronic pain creates a powerful sense of not being alone — something that itself helps downregulate the nervous system.
• Skills for life after The Bridge — The goal is not just improvement during your stay but equipping you with tools and practices that continue supporting recovery long after you return home.

"What I find most rewarding," Dr. Brooks shares, "is watching someone who arrived convinced their condition was permanent begin to experience moments of relief — and then realize those moments can become their new normal."

"We don't just treat CRPS symptoms. We help your nervous system remember how to feel safe — and from that safety, genuine healing becomes possible." — Dr. Daren Brooks, D.O.

Frequently Asked Questions