• 25 Oct, 2026
• UnityPain
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What Is CRPS? Complex Regional Pain Syndrome Explained

When Pain Becomes More Than Pain

Imagine burning your hand on a hot stove. The pain should fade after a few days. But what if it didn’t? What if the pain kept getting worse instead of better — and spread to areas that were never even injured? That is what life with Complex Regional Pain Syndrome, or CRPS, can feel like. If you or someone you love is living with this condition, please know that you are not imagining it. CRPS is a real, recognized medical condition, and you deserve real answers and real care.

CRPS is one of the most misunderstood pain conditions there is. Many people go months or even years before getting a correct diagnosis. That journey can be exhausting and heartbreaking. This article is here to help you understand what CRPS is, what causes it, and what kinds of help may be available to you.

What Is CRPS?

CRPS stands for Complex Regional Pain Syndrome. It is a chronic pain condition that most often affects one arm, leg, hand, or foot. The pain is usually much stronger than what you would expect from the original injury. In some cases, there may not even be an obvious injury that started it.

There are two types of CRPS. Type 1, formerly called Reflex Sympathetic Dystrophy (RSD), happens without confirmed nerve damage. This is the most common type. Type 2, formerly called Causalgia, involves confirmed damage to a specific nerve. Both types share many of the same symptoms and can be equally disabling. Doctors diagnose CRPS based on your symptoms and a careful physical exam, since there is no single lab test or imaging scan that confirms it.

What Are the Symptoms?

CRPS causes a wide range of symptoms that can come and go or change over time. The most common symptom is intense, ongoing pain — often described as burning, stabbing, or like an electric shock. Even a light touch, like clothing brushing against the skin, can cause severe pain. This is called allodynia.

Along with pain, people with CRPS may notice other changes in the affected area. These can include:

• Skin that changes color — turning red, blue, or pale
• Skin that feels much warmer or cooler than the rest of the body
• Swelling in the affected limb
• Changes in how fast hair and nails grow
• Sweating more or less than normal
• Stiffness or trouble moving the affected area
• Muscle weakness or loss of muscle over time

These symptoms happen because the nervous system and immune system are sending the wrong signals. The body’s normal pain response gets stuck in the “on” position, even when there is no longer a reason for it.

What Causes CRPS?

Doctors and researchers do not yet fully understand why some people develop CRPS and others do not. In most cases, CRPS starts after an injury, surgery, stroke, or heart attack. Common triggers include fractures, sprains, or even minor injuries like a needle stick. However, the severity of the original injury does not predict whether CRPS will develop.

Current research suggests that CRPS involves problems in both the central nervous system (the brain and spinal cord) and the peripheral nervous system (the nerves throughout your body). It may also involve an abnormal inflammatory response. Some researchers believe that the nervous system becomes “sensitized” and continues to send pain signals long after healing should have occurred. Genetics may also play a role, though more research is still needed to understand this fully.

How Is CRPS Diagnosed?

Getting a CRPS diagnosis often takes time, and that wait can be incredibly frustrating. There is no single test for CRPS. Instead, doctors use something called the Budapest Criteria, a set of established guidelines that look at your symptoms, medical history, and physical exam findings together.

Your doctor may also order tests to rule out other conditions. These can include X-rays, bone scans, MRI imaging, or nerve studies. It is important to see a doctor who is familiar with CRPS and chronic pain conditions. Early diagnosis and treatment are linked to better outcomes, so do not wait to seek help if you suspect something is seriously wrong.

How Is CRPS Treated?

There is no single cure for CRPS, but many people find meaningful relief with the right combination of treatments. The goal is to reduce pain, improve movement, and help you get back to doing the things that matter to you. Treatment usually works best when it combines several approaches at the same time.

Common treatment options may include:

• Physical therapy — Gentle movement and exercises to help restore function and reduce sensitivity
• Medications — Including anti-inflammatory drugs, nerve pain medications, or other options your doctor may recommend
• Nerve blocks and injections — Procedures that target the nerves involved in sending pain signals
• Psychological support — Counseling and coping strategies, since chronic pain affects mental health too
• Spinal cord stimulation — A procedure sometimes used for severe cases that do not respond to other treatments

At Unity Pain Management in Modesto, CA, our team understands how complex and overwhelming CRPS can be. We offer a range of services including medication management, trigger point injections, and referrals to physical therapy and spine injection specialists — and we work with most insurance plans. A personalized evaluation can help determine which options may be right for your situation.

Living With CRPS — There Is Hope

Living with CRPS is hard. The pain is real, the frustration is real, and the toll it takes on your daily life is real. But you do not have to face it alone. Many people with CRPS do find ways to manage their symptoms and improve their quality of life with the right support team in place.

If you have been struggling to get answers, or if your current treatment plan is not working, please reach out to a pain management specialist. You deserve care from a team that listens, believes you, and works with you toward better days. Do not give up — help is available, and taking that first step toward an evaluation could make all the difference.

References

• Harden, R. Norman, et al. “Validation of Proposed Diagnostic Criteria (the ‘Budapest Criteria’) for Complex Regional Pain Syndrome.” Pain. 2010.
• National Institute of Neurological Disorders and Stroke. “Complex Regional Pain Syndrome Fact Sheet.” National Institutes of Health. 2023.
• Birklein, Frank, and Margarita Dimova. “Complex Regional Pain Syndrome — Up to Date.” Pain Reports. 2017.
• Bruehl, Stephen. “Complex Regional Pain Syndrome.” BMJ. 2015.
• Mayo Clinic Staff. “Complex Regional Pain Syndrome.” Mayo Clinic. 2023.