Pain Science Glossary | Terms Explained Simply

Published March 4, 2026 · 10 min read

By Tauri Urbanik, research writer and PainApp founder

Why a glossary?

Pain science has a lot of terminology. And most of it is designed for researchers, not for the person sitting in pain trying to understand what is happening to them. This glossary translates the science into language that actually makes sense.

Every term below is explained the way you would explain it to a friend. No jargon for the sake of jargon.

A

Acceptance and Commitment Therapy (ACT)

A form of therapy that helps people accept difficult experiences rather than fighting them. For chronic pain, ACT focuses on living a full life alongside pain rather than eliminating it. Brain-based approaches like PRT take a different angle by targeting the pain signals themselves. See how PRT compares to other approaches.

Acute pain

Pain that shows up for a reason. You stub your toe, your toe hurts. That is acute pain. It is protective, time-limited, and directly connected to tissue damage. The opposite of chronic pain. Acute pain is your body working correctly.

Allodynia

When things that should not hurt, hurt. A light touch on your skin. Clothes against your body. A gentle breeze. If normal sensations produce pain, that is allodynia. It is a classic sign of central sensitization and suggests your nervous system has turned up its sensitivity.

Amygdala

The brain's alarm system. It decides what is dangerous and triggers your fight-or-flight response. In neuroplastic pain, the amygdala can become overactive, interpreting safe signals as threats and maintaining pain even without tissue damage.

B

Biofeedback

A technique that uses sensors to show you what your body is doing in real time, like heart rate or muscle tension. By watching these signals, you can learn to control them. Research shows biofeedback is effective for conditions like migraines, with effect sizes holding steady at 15-month follow-up. It is one of many brain-based approaches to pain.

Brain-based pain

Another term for neuroplastic pain. Pain generated by neural pathways in the brain rather than by structural damage in the body. The pain is real. The source is different from what most people expect.

C

Catastrophizing

Not what it sounds like. Pain catastrophizing is not being dramatic. It is a measurable pattern where your brain amplifies threat signals around pain. Thinking "this will never get better" or "something must be seriously wrong" keeps the danger signals firing. Reducing catastrophizing is a key part of recovery.

Central sensitization

Your nervous system stuck on high alert. The brain and spinal cord amplify incoming signals so that normal sensations register as painful. It is like a volume knob turned to maximum. Central sensitization is a core mechanism in fibromyalgia, migraines, IBS, and many other chronic pain conditions (Woolf, Pain, 2011↗).

Chronic pain

Pain that persists beyond normal healing time, typically more than 3 months. Some persistent pain is not a sign of ongoing damage. Research increasingly shows it is driven by learned brain pathways rather than structural problems.

Cognitive Behavioral Therapy (CBT)

A therapy that helps you change unhelpful thought patterns. For chronic pain, CBT teaches coping strategies and challenges negative beliefs about pain. It has solid evidence but tends to produce more modest results than PRT for neuroplastic pain.

Comorbidity

Having more than one condition at the same time. Chronic pain frequently co-occurs with anxiety, depression, fatigue, and sleep problems. This is not a coincidence. They often share the same underlying mechanism: an overactive nervous system.

Conditioned response

A learned reaction. Pavlov's dog salivated at a bell. Your brain can learn to produce pain in response to triggers that are not actually dangerous, like sitting, bending, or even thinking about a stressful situation. Breaking these conditioned responses is central to recovery.

D

Danger signals

The brain's interpretation of incoming information as threatening. In neuroplastic pain, your brain misinterprets safe signals from your body as dangerous and responds with pain. PRT works by helping your brain reclassify these signals as safe.

Disc bulge

A bulging or protruding spinal disc. Sounds scary. But research shows disc bulges appear in 50% of pain-free 40-year-olds and nearly everyone over 80 (Brinjikji et al., AJNR, 2015↗). A disc bulge on your MRI does not necessarily mean it is causing your pain.

Dorsal horn

The part of your spinal cord that receives incoming pain signals from the body before sending them to the brain. In central sensitization, the dorsal horn becomes hyper-excitable, amplifying signals before they even reach your brain.

E

EAET (Emotional Awareness and Expression Therapy)

A therapy that addresses emotional avoidance, conflict, and pain-related processes. In a fibromyalgia trial, EAET did not differ from CBT on the primary or most secondary outcomes, although it showed advantages on selected outcomes (Lumley et al., PAIN, 2017↗).

Extinction (neural)

How your brain unlearns a pattern. When a danger signal stops being paired with actual danger, the brain gradually stops responding to it. This is the mechanism behind PRT. You are not fighting the pain. You are letting your brain learn that it does not need the pain anymore.

F

Fear-avoidance

A cycle where fear of pain leads to avoiding activities, which leads to more sensitivity, which leads to more pain, which leads to more fear. Breaking this cycle is one of the most important steps in neuroplastic pain recovery.

Fibromyalgia

Widespread chronic pain with no identifiable structural cause. Research shows fibromyalgia is driven by central sensitization, where the brain amplifies pain signals throughout the body. Brain-based treatments significantly outperform conventional approaches.

Functional MRI (fMRI)

A brain scan that shows which areas are active in real time. fMRI studies have been crucial for proving that chronic pain involves different brain patterns than acute injury pain, and that brain retraining changes those patterns.

G

Gate control theory

An older but still useful model of pain. The idea is that the spinal cord has "gates" that can open or close to allow pain signals through. Modern understanding has expanded this to include the brain's role in deciding what gets through the gate.

Graded exposure

Gradually reintroducing movements or activities that you have been avoiding due to pain. Not pushing through pain, but gently showing your brain that the feared activity is safe. Done correctly, graded exposure retrains the danger signals.

Gut-directed hypnotherapy

A structured behavioral treatment for IBS that uses focused relaxation and gut-related suggestions. Reviews support it as an option for pain or global symptoms, although study results and delivery formats vary.

H

Hyperalgesia

When painful stimuli hurt more than they should. A pinprick feels like a stab. A bump feels like a punch. Your pain processing system is amplifying signals beyond what the input warrants. This is different from allodynia, where non-painful stimuli become painful.

K

Kinesiophobia

Fear of movement. You avoid bending, lifting, running, or other activities because you believe they will cause damage or make your pain worse. Kinesiophobia keeps the fear-avoidance cycle spinning and is one of the strongest predictors of chronic pain persistence.

M

Mind-body syndrome (MBS)

An older term for conditions involving neuroplastic pain. Dr. John Sarno used the term TMS (Tension Myositis Syndrome), later updated to MBS. It refers to pain and other physical symptoms generated by the brain in response to emotional and psychological factors.

N

Neural pathways

Routes in your brain and nervous system that carry signals. In neuroplastic pain, specific neural pathways have learned to produce pain. The good news: neural pathways are not fixed. They can be retrained, which is exactly what the "neuroplastic" in neuroplastic pain means.

Neuroplastic pain

Chronic pain generated by learned patterns in the brain rather than by tissue damage. The brain creates real pain signals through neural pathways that have become stuck. Research shows this accounts for some chronic pain. And because it is learned, it can be unlearned.

Neuroplasticity

Your brain's ability to change, reorganize, and form new connections throughout your life. This is actually great news for chronic pain. The same neuroplasticity that allowed your brain to learn a pain pattern allows it to unlearn that pattern.

Nocebo effect

The opposite of placebo. When negative expectations make symptoms worse. Being told "you have the spine of an 80-year-old" can increase pain even though age-related changes are normal. The nocebo effect demonstrates how powerfully your beliefs influence your pain.

Nociception

The process by which your nerves detect potentially harmful stimuli and send signals toward the brain. Nociception is not pain. It is just information traveling up the nervous system. Your brain decides whether that information becomes pain or not.

P

Pain catastrophizing

See catastrophizing.

Pain neuroscience education (PNE)

Teaching people how pain actually works as a treatment strategy. Research shows that simply understanding the neuroscience of pain reduces pain, fear, and disability (Louw et al., Physiotherapy Theory and Practice, 2016↗). Learning IS treatment.

Pain Reprocessing Therapy (PRT)

A brain-based treatment developed by Alan Gordon that teaches your nervous system to reinterpret pain signals as safe. A clinical trial published in JAMA Psychiatry found 33 of 50 participants assigned to PRT for primary chronic back pain were pain-free or nearly pain-free after 4 weeks of PRT, with results lasting at 5-year follow-up (Ashar et al., JAMA Psychiatry, 2022↗). Learn more about PRT.

Peripheral sensitization

When nerve endings in your body become more sensitive to stimuli. This is different from central sensitization, which happens in the brain and spinal cord. Both can contribute to chronic pain.

Phantom limb pain

Pain felt in an amputated limb. The limb is gone, but the brain still produces pain signals for it. Phantom limb pain is one of the most powerful demonstrations that pain is generated by the brain, not the body.

Placebo response

Improvement that comes from expecting improvement rather than from a specific treatment. Interestingly, brain-based pain treatments like PRT produced significantly better outcomes than placebo in clinical trials, confirming they work through specific mechanisms, not just expectation.

S

Safety reappraisal

The core technique in PRT. Looking at a pain sensation and helping your brain interpret it as safe rather than dangerous. Not ignoring the pain. Not fighting it. Simply giving your brain new, accurate information: this signal is not a sign of damage.

Somatic tracking

A technique used in PRT where you observe your pain sensations with curiosity instead of fear. Rather than bracing against the pain, you notice it neutrally. This sends safety signals to your brain and gradually reduces the pain response.

Structural pain

Pain caused by actual tissue damage. A broken bone, a torn ligament, a tumor pressing on a nerve. Structural pain is real and requires medical treatment. The key distinction is that some persistent pain is not structural, even when imaging shows "findings."

T

TMS (Tension Myositis Syndrome)

A term coined by Dr. John Sarno for pain caused by the brain rather than structural damage. The concept paved the way for modern neuroplastic pain science. TMS is now more commonly referred to as neuroplastic pain or mind-body syndrome.

V

Visceral pain

Pain from internal organs. Conditions like IBS and pelvic pain involve visceral pain that is often neuroplastic in nature. The organs themselves may be healthy, but the brain is amplifying or generating pain signals from them.

Understanding is treatment

Here is the thing that surprises most people. Learning this terminology is not just academic. Research shows that understanding pain neuroscience actually reduces pain (Louw et al., Physiotherapy Theory and Practice, 2016↗).

Every term you just read is a small piece of a bigger picture. Your pain is real. The science behind it is real. And the possibility of recovery is real too.

Frequently asked questions

What does neuroplastic pain mean?

Neuroplastic pain is chronic pain produced by learned neural pathways in the brain rather than ongoing tissue damage. The brain essentially learns a pain habit and keeps producing pain signals even after the body has healed.

What is central sensitization in simple terms?

Central sensitization means your brain and spinal cord have turned up the volume on pain signals. Normal touch or movement that should not hurt starts to hurt because the nervous system is on high alert.

What is Pain Reprocessing Therapy?

Pain Reprocessing Therapy (PRT) is a treatment that teaches your brain to reinterpret chronic pain signals as safe rather than dangerous. A clinical trial showed 33 of 50 participants assigned to PRT were pain-free or nearly pain-free after 4 weeks.

What is the difference between acute and chronic pain?

Acute pain is a normal response to injury or tissue damage. It protects you. Chronic pain persists beyond normal healing time, often 3+ months, and is frequently driven by brain-based mechanisms rather than ongoing damage.

References

1. Ashar YK, et al. Effect of Pain Reprocessing Therapy vs Placebo and Usual Care for Patients With Chronic Back Pain: A Randomized Clinical Trial. JAMA Psychiatry. 2022;79(1):13-23.DOI: 10.1001/jamapsychiatry.2021.2669
2. Woolf CJ. Central sensitization: implications for the diagnosis and treatment of pain. Pain. 2011;152(3 Suppl):S2-S15.DOI: 10.1016/j.pain.2010.09.030
3. Brinjikji W, et al. Systematic Literature Review of Imaging Features of Spinal Degeneration in Asymptomatic Populations. AJNR Am J Neuroradiol. 2015;36(4):811-816.DOI: 10.3174/ajnr.A4173
4. Lumley MA, et al. Emotional awareness and expression therapy, cognitive-behavioral therapy, and education for fibromyalgia: a cluster-randomized controlled trial. PAIN. 2017;158(12):2354-2363.DOI: 10.1097/j.pain.0000000000001036
5. Louw A, et al. The efficacy of pain neuroscience education on musculoskeletal pain: A systematic review of the literature. Physiotherapy Theory and Practice. 2016;32(5):332-355.DOI: 10.1080/09593985.2016.1194646