Central Sensitization Explained: What the Science Says About Chronic Pain
This blog is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Consult a qualified healthcare professional about your symptoms and treatment options. Individual experiences and treatment outcomes may vary.
You expected your pain to improve as an injury healed, but it never quite did. Maybe everyday movement now feels more uncomfortable than it used to. Perhaps light pressure or touch can trigger pain, or your symptoms have become more widespread over time.
One possible piece of this puzzle is central sensitization.
Central sensitization describes increased responsiveness of nociceptive neurons in the central nervous system. It can contribute to increased sensitivity to pain, but it should not automatically be assumed to explain every case of chronic pain.
Understanding this distinction can help you make sense of persistent pain without reducing it to a single cause or diagnosis.
What Is Central Sensitization?
Central sensitization is a change in the responsiveness of the central nervous system that can contribute to increased pain sensitivity.
Think about someone whose back initially became painful after an injury. Even after the original injury has healed, they may continue to experience significant pain with certain movements or sensations.
That does not necessarily mean there is ongoing tissue damage. Pain is influenced by how the nervous system processes sensory information, and several mechanisms can contribute to persistent symptoms.
Central sensitization is different from peripheral sensitization, which involves increased responsiveness of nociceptive neurons in peripheral tissues.
A clinical perspective
A person can experience very real and disruptive pain even when the amount of pain they feel does not appear to correspond neatly with an injury or imaging finding.
That does not mean the pain is imaginary. It means there may be several factors involved in how pain is generated, maintained, or experienced.
How Can Central Sensitization Affect Chronic Pain?
Pain is more than a signal travelling from an injured body part to the brain.
The nervous system continually processes information about pressure, temperature, movement, and potential threats. Changes in how those signals are processed can contribute to pain hypersensitivity.
For some people, this may mean painful stimuli feel more intense or that normally non-painful sensations become uncomfortable.
Central sensitization is a mechanism, not a diagnosis, that automatically explains chronic pain. Persistent pain can involve nociceptive, neuropathic, nociplastic, or combinations of these mechanisms.
What Are the Symptoms of Central Sensitization?
There is no single symptom checklist that proves someone has central sensitization. However, clinicians may look for signs of increased pain sensitivity.
These may include:
Increased sensitivity to touch or pressure
Pain from stimuli that would not normally be painful
A stronger-than-expected response to painful stimuli
Pain or sensitivity extending beyond the original area
Persistent or widespread pain alongside other symptoms
Two terms you may encounter are allodynia and hyperalgesia.
Allodynia
Allodynia refers to pain resulting from a stimulus that would not normally be painful.
For example, light pressure from clothing, a bedsheet, or gentle touch may become uncomfortable when it previously felt completely normal.
Hyperalgesia
Hyperalgesia refers to an increased pain response to something that is already painful.
These signs can occur with sensitization, but they do not prove that central sensitization is the only explanation for someone's symptoms.
What Conditions May Involve Central Sensitization?
Central sensitization has been discussed in relation to various persistent pain conditions, including some presentations of musculoskeletal pain and fibromyalgia.
However, it would be misleading to say that these conditions are simply “caused by” central sensitization.
People can have multiple pain mechanisms at the same time. Their symptoms and contributing factors can also change over time.
That is why a careful assessment is more useful than trying to match your symptoms to a single label.
Central Sensitization vs. Nociplastic Pain: Are They the Same?
No. Central sensitization and nociplastic pain are related concepts, but they are not interchangeable.
Nociplastic pain is a mechanistic pain descriptor used when altered nociception contributes to pain without clear evidence of tissue damage causing nociceptor activation or a lesion or disease of the somatosensory system.
Nociplastic pain is one of three major mechanistic pain descriptors, alongside nociceptive pain and neuropathic pain.
Central and peripheral sensitization can occur with nociplastic pain, but sensitization is not specific to nociplastic pain.
A simple way to understand the difference
| Term | What it describes |
|---|---|
| Nociceptive pain | Pain associated with actual or threatened tissue damage |
| Neuropathic pain | Pain caused by a lesion or disease of the somatosensory nervous system |
| Nociplastic pain | Pain involving altered nociception that is not fully explained by nociceptive or neuropathic mechanisms |
| Central sensitization | Increased responsiveness of nociceptive neurons in the central nervous system |
Key takeaway: These terms describe different aspects of pain. One label should not automatically be used to explain every person's persistent pain.
How Do Clinicians Assess Central Sensitization?
There is no simple blood test, scan, or symptom quiz that independently confirms central sensitization in routine clinical practice.
Assessment generally starts with the bigger picture.
A clinician may explore:
When the pain began
How it has changed over time
What makes it better or worse
Previous injuries, illnesses, or treatments
Sensitivity to touch, pressure, temperature, or movement
Sleep and daily functioning
Other symptoms that may point toward different pain mechanisms
The goal is not simply to attach a label. It is to understand the person's pain experience, consider possible contributing mechanisms, and determine whether other explanations need to be investigated.
Not sure what's contributing to your persistent pain?
FlowState Therapy's pain-management service begins with an evaluation of your health history, pain experience, and treatment goals to determine whether its approach may be appropriate.
What Can Help With Chronic Pain?
There is no single treatment that works for everyone with persistent pain.
Depending on the person and the mechanisms involved, care may include pain education, physical rehabilitation or graded activity, psychological approaches, medication when appropriate, or coordinated care.
The goal is often broader than reducing a pain score. Sleep, movement, daily function, emotional wellbeing, and quality of life can all matter when developing a pain-management plan.
Psychological factors can influence pain without making the pain imaginary or “all in your head.” A person's pain experience can be shaped by biological, psychological, and social factors.
For people looking for chronic pain therapy in Ottawa, the starting point may be a conversation about symptoms, health history, goals, and available options rather than assuming one specific treatment is right for everyone.
Health Canada’s An Action Plan for Pain in Canada discusses the need for timely, equitable, person-centred pain care and better coordination across the healthcare system.
Can Psychedelic Therapy Help With Chronic Pain?
Psychedelic-assisted approaches are an emerging area of research in pain care.
That distinction matters. Research is still developing, and psychedelic therapy should not be presented as an established treatment specifically for central sensitization.
FlowState Therapy offers psychedelic pain-management services in Ottawa/Gatineau. Its process includes an evaluation of health history, pain experience, and treatment goals before determining whether the approach may be appropriate.
If you're considering psychedelic therapy in Ottawa, an assessment can help you understand whether this type of care may be suitable for your circumstances.
Frequently Asked Questions
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No. Chronic pain describes pain that persists over time, while central sensitization describes increased responsiveness of nociceptive neurons within the central nervous system.
A person can have chronic pain for many different reasons.
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No. They are related but distinct concepts.
Nociplastic pain is a mechanistic pain descriptor, while central sensitization refers specifically to increased responsiveness within the central nervous system.
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No.
Pain is a real experience. Psychological factors can influence how pain is processed without making the pain imaginary or “just psychological.”
A person's physical symptoms should be taken seriously while considering the biological, psychological, and social factors that may influence their pain experience.
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It can be one possible mechanism considered when someone experiences widespread or heightened pain sensitivity.
However, widespread pain can have different causes and mechanisms. A professional assessment can help determine what factors may be contributing.
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There is no single routine test that independently confirms central sensitization.
Clinicians may instead consider the person's pain history, sensory symptoms, physical findings, and overall presentation while considering other possible explanations.
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Consider speaking with a qualified healthcare professional if pain continues, interferes with sleep or daily activities, becomes increasingly difficult to manage, or affects your quality of life.
A professional can help assess your symptoms and determine whether further investigation or a different approach to pain management may be appropriate.
Understanding Your Chronic Pain Is a Step Forward
Living with persistent pain can be frustrating, particularly when the symptoms do not seem to have a straightforward explanation.
Central sensitization may help explain some patterns of increased pain sensitivity, but it is only one part of a much larger picture.
The most useful question may not be:
“Do I have central sensitization?”
Instead, consider:
“What mechanisms could be contributing to my pain, and what options are appropriate for me?”
That shift can lead to a more individualized conversation about assessment, treatment, and long-term pain management.
Explore Your Options With FlowState Therapy
If persistent pain is affecting your everyday life and you're exploring pain-management options, FlowState Therapy offers services in Ottawa/Gatineau.
You can start with a free 15-minute information call to ask questions about services, costs, and next steps.
