Pain is classified three ways: by mechanism (nociceptive, neuropathic or nociplastic), by duration, and by the tissue it comes from. The category decides whether a treatment has any chance of working. An anti-inflammatory that clears up a sprained ankle in three days will do close to nothing for burning nerve pain in the feet.
Almost every article about pain types gives you a list. A list is not useful on its own. What helps is knowing which category your pain falls into, because the category decides whether a treatment has any chance of working. An anti-inflammatory that clears up a sprained ankle in three days will do close to nothing for burning nerve pain in the feet. A nerve block that shuts down a facet joint completely will not quiet pain made by the brain and spinal cord themselves.
This page covers how pain medicine actually sorts pain: by mechanism, by how long it lasts, and by the tissue it comes from. Then it covers the part most pages leave out. That is what each category changes about treatment.
Start with what pain is
The International Association for the Study of Pain revised its definition of pain in 2020 to “an unpleasant sensory and emotional experience associated with, or resembling that associated with, actual or potential tissue damage.” Two things in that sentence do real work. Emotional is part of the definition, not tacked on. And “or resembling that associated with” was added on purpose. It means pain without tissue damage that can be shown is still pain, not a lesser kind of complaint. That matters for the third mechanism below. Most pain-type articles never mention it.
The three pain mechanisms
Mechanism is the most important axis in the clinic, because it ties most directly to treatment. There are three accepted mechanism types.
Nociceptive pain
Nociceptive pain comes from actual or threatened damage to tissue that is not nerve — bone, muscle, ligament, tendon, joint capsule, skin. The nerves are working correctly. They are reporting a real problem in the tissue they watch over.
It usually acts the way people expect pain to act. It matches the size of the injury. It is worse with use and better with rest. You can often point to it. And it usually improves as the tissue heals. People describe it as aching, throbbing, sharp with movement, or a deep pressure.
Common examples: a fracture, osteoarthritis of the knee or hip, a rotator cuff tear, facet joint arthropathy, sacroiliac joint pain, post-surgical pain in the first days after an operation.
Neuropathic pain
Neuropathic pain is caused by a lesion or disease of the somatosensory nervous system itself (the parts of the nervous system that carry body feelings like touch and pain). The problem is in the wiring, not in the tissue the wiring reports on. The nerve sends a pain signal that does not match any tissue damage where the pain is felt.
It sounds different, and the difference is usually clear once you know to listen for it. Patients describe burning, electric shocks, shooting, stabbing, pins and needles, crawling, or numbness that hurts. The pain follows the area a nerve supplies rather than a joint or a muscle. Two findings are near-signatures: allodynia, where a normally painless stimulus — a bedsheet, a sock, a breeze — causes pain, and hyperalgesia, where a mildly painful stimulus causes far more pain than it should. Neuropathic pain also tends to be worse at night. That is one of the few clues that sets it apart from a mechanical problem in the same limb.
Common examples: diabetic peripheral neuropathy and postherpetic neuralgia after shingles. Another is painful radiculopathy (what most people mean when they say sciatica). Others are trigeminal neuralgia, pain after nerve injury during surgery, and phantom limb pain. Central neuropathic pain after spinal cord injury or stroke is one more.
Grading matters here. Neuropathic pain does not get a yes-or-no label. It is graded as possible, probable, or definite. The grade depends on three things. Does the pain map onto a real nerve pathway? Does the exam confirm sensory signs in that area? Does a test confirm a lesion or disease of the somatosensory system? The group that wrote the grading system adds a useful caution. Even the “definite” level shows that a lesion is present, not that it must be the cause of the pain.
Nociplastic pain — the third category most pages miss
Nociplastic pain comes from altered nociception (changed pain signaling). There is no clear evidence of tissue damage firing the pain sensors. There is no evidence of disease or lesion of the somatosensory system causing the pain. Put plainly: the tissues look fine, and the nerves test intact. The pain is real. It comes from changes in how the nervous system processes signals.
This is the newest of the three types. It changes how a large group of patients gets understood. Before it existed, these patients were forced into whichever of the other two boxes fit worst. Or they were told nothing was found.
Published clinical criteria cover chronic nociplastic pain of the muscles, bones and joints. Among other things, they require that the pain be regional rather than in one small spot. It must be present for at least three months. Nociceptive or neuropathic mechanisms must not fully explain it. And there must be signs of pain hypersensitivity in the painful region. Other features raise confidence: sensitivity to sound, light or odor, poor sleep that does not refresh, fatigue, and trouble with attention or memory.
Common examples: fibromyalgia, many cases of persistent nonspecific low back pain, some temporomandibular disorders, irritable bowel syndrome, and interstitial cystitis or bladder pain syndrome.
Mixed pain — the ordinary case
Real patients are rarely one thing. A person with long-standing lumbar degeneration (wear in the lower spine) can have nociceptive facet pain, neuropathic radicular pain (nerve root pain) down one leg, and nociplastic amplification on top of both. Consensus recommendations sort low back pain by phenotype (pattern type). They are clear that the goal is finding the dominant mechanism, not proving a single one. The same group notes the recommendations are an early step. They are not yet ready for routine clinical use without more evidence. That is an honest limit of the framework. Know it before anyone tells you a questionnaire has sorted you.
Acute pain and chronic pain
Duration is a second, separate axis. Any of the three mechanisms can be acute or chronic.
Acute pain is recent. In most cases it has a clear cause, and it goes away as the cause heals. It is doing a job: it forces rest and protects healing tissue.
Chronic pain is defined as pain that persists or recurs for more than three months. That three-month line is not random red tape. It is the working cutoff in the ICD-11 classification of chronic pain.
The bigger change in that classification is in its structure. Chronic pain is split into chronic primary pain, where the pain is a disease in its own right rather than a symptom of something else. The other side is six categories of chronic secondary pain, where the pain comes from a known underlying condition. These are cancer-related, neuropathic, visceral, post-traumatic and post-surgical, headache and orofacial, and musculoskeletal.
Why this matters to you: chronic primary pain is a positive diagnosis. It is not what is left after everything else is ruled out. It does not mean nothing was found. It means the pain itself is the condition being treated.
Somatic and visceral pain
A third axis describes where nociceptive pain starts.
Somatic pain comes from the body wall, muscles, bones and joints. Surface somatic pain — skin, mucosa — is sharp and easy to pin down. Deep somatic pain — muscle, bone, joint, fascia — is duller and aching. It is harder to point at, but you can still roughly place it.
Visceral pain comes from the internal organs, and it acts unlike anything else. It is spread out and hard to pin down. It matches the amount of organ damage only loosely. It typically comes with autonomic responses (automatic body reactions) — nausea, sweating, changes in heart rate and blood pressure. It also carries a strong negative emotional quality. Patients often call it sickening or frightening rather than simply painful. And it refers.
Referred pain, and why it fools people
Referred pain is felt somewhere other than where it starts. The classic example is a heart attack felt in the left arm and jaw. Others are gallbladder pain in the right shoulder blade and kidney pain in the groin.
The mechanism is convergence, meaning signals meet at one point. Nerve fibers from the organs feed into the dorsal horn of the spinal cord. There they land on viscerosomatic convergent neurons. These cells also get input from the skin and deep tissues of the same body segments. The brain gets a signal from this shared relay and blames the body wall. That is where it has far more practice placing sensation.
Referral is not limited to organs. Deep body structures refer too, in set patterns. Hip osteoarthritis refers into the knee. Cervical facet joints refer into the head and shoulder. Lumbar facet joints refer into the buttock and thigh. That is why the spot a patient points to is a clue, not an answer. And it is why a workup that only images the painful spot misses a large share of cases.
Why the category changes the treatment
This is the part that makes sorting pain worth doing. The categories are not just labels. They predict which treatments have a way to work.
Nociceptive pain
It responds to treatments aimed at the tissue and the pain input. These include anti-inflammatory measures, load management and gradual loading, and physical therapy. They also include image-guided interventional procedures aimed at the pain source once it is found. Examples are facet or medial branch procedures and sacroiliac joint procedures. Others are epidural injections where an inflamed nerve root is the source, and radiofrequency ablation of the nerves supplying a painful joint. Diagnostic blocks earn their place here, because confirming the source before treating it is what separates a targeted procedure from a guess.
Neuropathic pain
It responds poorly to standard anti-inflammatories. That is the most common reason patients arrive sure that nothing works. The NeuPSIG systematic review and meta-analysis gave its strongest backing to four drugs. They were tricyclic antidepressants, serotonin–norepinephrine reuptake inhibitors, pregabalin and gabapentin. Here are the actual numbers, because the honest version is more useful than the confident one. Combined numbers needed to treat for 50% pain relief were 6.4 for SNRIs, 7.7 for pregabalin, and 7.2 for gabapentin. That is how many patients had to be treated for one of them to get that much relief. That means most patients in those trials did not reach 50% relief on a single drug. The authors concluded that poor response to drug treatment is a major unmet need. That is exactly the gap that interventional and neuromodulation approaches exist to address: nerve blocks, sympathetic blocks, and spinal cord or peripheral nerve stimulation.
Nociplastic pain
This is where treating the wrong category does real harm. Repeated procedures aimed at a structure that is not making the pain bring repeated letdowns. Every failed result feeds the belief that the pain cannot be treated. Care here is built differently. It uses graded activity and reconditioning, and it restores sleep. It treats the metabolic and inflammatory drivers where they are present. It uses psychological approaches with evidence behind them in chronic pain. That includes Acceptance and Commitment Therapy, which the Padda Institute delivers in-house rather than referring out. Interventional procedures still have a role where a real nociceptive or neuropathic piece is adding to the pain. Mixed cases are the rule. But procedures are not the whole plan.
Visceral and referred pain
This requires finding the actual source. Say the source is found, and the pain persists despite treatment of the underlying condition. Then targeted sympathetic and plexus blocks are the interventional options — a celiac plexus block for upper abdominal visceral pain, for example.
What this framework cannot do
Here are two honest limits. A page that only sells the framework is not much better than a list.
The categories are descriptors, not diagnoses. Nociplastic pain in particular is defined partly by what it is not. So it depends on how carefully the other two were ruled out. A rushed exam produces a nociplastic label the same way it produces a “nothing found” label.
The evidence base for mechanism-guided treatment is younger than the framework. The low back pain phenotyping consensus says it plainly. Early evidence suggests these phenotypes might respond differently to treatment. But more research is needed before specific recommendations can be made. Anyone who claims a questionnaire picks your treatment is ahead of the evidence.
There is a bigger problem for the patients this practice actually treats. Randomized trials of pain treatments routinely leave people out. They exclude people with significant metabolic dysfunction, obesity or diabetes. They exclude people with autoimmune and inflammatory disease, or several other conditions at once. They exclude people on many drugs (polypharmacy), people who failed earlier treatment, and people with long-lasting symptoms. Those exclusions make cleaner trials and a narrower answer. A modest result in a screened group does not prove a treatment fails in the patients who were screened out. It also does not test what happens when treatments are combined or given in sequence rather than alone. Trials also tend to run short. So they measure how fast a treatment starts working, not how long it lasts. None of that is a reason to ignore the evidence. It is a reason to read it as a picture of the group that was studied.
How the category actually gets determined
Not by a quiz. The working category comes from your history: what the pain feels like, where it goes, what sets it off and eases it, and how it acts at night. That is paired with a physical exam. The exam looks for changed feeling in the area a nerve supplies and for hypersensitivity in the painful region. When a nerve problem is suspected, electrodiagnostic testing (EMG and nerve conduction studies) can confirm or rule out a lesion. When a tissue pain source is suspected, a diagnostic block confirms whether that structure is truly making the pain before anything is done to it.
Dr. Gurpreet Singh Padda, MD, MBA, MHP evaluates and treats all three mechanisms. That includes the mixed cases that make up most of a pain practice. If your pain has been treated as one category and has not responded, the working theory may be what needs a second look.
To be seen: call or text us, or request an appointment. No referral is required, and you do not need to be an existing patient. Same-day appointments are available.
Frequently asked questions
1. What are the main types of pain?
Pain is sorted on three separate axes. By mechanism there are three types. Nociceptive pain comes from tissue damage. Neuropathic pain comes from a lesion or disease of the nervous system. Nociplastic pain comes from altered pain processing that neither of the first two fully explains. By duration, pain is acute or chronic, with three months as the dividing line. By source, nociceptive pain is somatic (body wall, muscles, joints) or visceral (internal organs). Most patients with long-standing pain have more than one mechanism running at once. Learn more: Why medications and surgery may not fix your pain.
2. What type of pain do I have?
The pattern usually points the way. Aching, throbbing pain that is worse with use, better with rest, and easy to point to suggests nociceptive pain. Burning, shooting or electric pain that follows the area a nerve supplies suggests neuropathic pain. So does pain that is worse at night or comes with numbness or hypersensitivity to light touch. Widespread pain lasting months, with sleep that does not refresh, fatigue and sensitivity to sound or light, suggests a nociplastic piece. These overlap. So the working answer comes from a physical exam and, when needed, nerve testing. Learn more: What EMG and nerve conduction studies measure.
3. What is nociplastic pain?
Nociplastic pain comes from altered nociception (changed pain signaling). There is no clear evidence of tissue damage firing the pain receptors. There is no lesion that can be shown in the somatosensory nervous system. It is a positive category, not a way of saying nothing was found. Fibromyalgia is the classic example. Published criteria require regional pain, not pain in one small spot. It must be present at least three months, with signs of pain hypersensitivity in the affected region. Other supporting features include sleep that does not refresh, fatigue, and sensitivity to sound, light or odor. Learn more: Fibromyalgia and how widespread pain is evaluated.
4. What is the difference between nociceptive and neuropathic pain?
Nociceptive pain comes from tissue — a joint, a muscle, a bone. The nerves are working correctly and reporting a real problem. Neuropathic pain comes from damage to the nerves themselves. So the signal no longer matches any tissue injury where the pain is felt. The real-world difference is large. Nociceptive pain often responds to anti-inflammatory measures and to procedures aimed at the tissue source. Neuropathic pain often does not. It is treated with nerve-directed medications, nerve blocks and neuromodulation instead. Learn more: Why diabetic neuropathy burns worse at night.
5. When does acute pain become chronic pain?
The accepted cutoff is three months of pain that persists or recurs. The ICD-11 classification of chronic pain uses it. The classification also splits chronic primary pain, where the pain is the condition itself, from chronic secondary pain, where it follows a known underlying disease. Passing the three-month mark does not mean the pain is permanent. But it does mean the workup should look beyond the original injury. Learn more: What untreated chronic pain does to the brain.
6. What is referred pain?
Referred pain is felt in a place other than where it starts. Nerve fibers from internal organs and deep body structures meet on the same spinal cord neurons that get input from skin and muscle. So the brain blames the body wall for the signal. Hip arthritis felt in the knee, gallbladder pain in the right shoulder blade, and cervical facet pain felt in the head are all referred pain. It is a common reason imaging the painful spot finds nothing. Learn more: Mid-back pain between the shoulder blades.
7. What is visceral pain and how is it different?
Visceral pain starts in the internal organs. It is spread out and hard to pin down. It matches poorly with how much organ damage is present. It refers to other areas. And it typically comes with nausea, sweating and a strong sickening quality. Somatic pain from muscle, bone and joint is easier to pin down and more in line with the size of the injury. When visceral pain persists despite treatment of the underlying condition, targeted plexus and sympathetic blocks are an option. Learn more: Celiac plexus block for upper abdominal pain.
8. Why does knowing my pain type matter?
Because it decides which treatments have a way to work. Anti-inflammatories work on inflamed tissue and do fairly little for damaged nerves. A block that quiets a facet joint will not help pain made by the brain and spinal cord. Procedures repeated on a structure that is not the source bring repeated letdowns. Getting the category right is what turns a string of attempts into a plan. Learn more: Why pain injections stop working.
9. Can you have more than one type of pain at the same time?
Yes, and it is the usual case in long-standing pain. Someone with lumbar degeneration can have nociceptive facet pain, neuropathic radicular pain (nerve root pain) in one leg, and nociplastic amplification over both. The consensus recommendations on sorting low back pain are clear that the aim is finding the dominant mechanism, not proving a single one. Treatment plans that address only one piece of a mixed case tend to bring partial results. Learn more: Why leg pain persists after back surgery.
10. Which pain types respond to interventional procedures?
These procedures have the clearest way to work on nociceptive pain with a clear source. That is why diagnostic blocks are used to confirm the source before a longer-acting procedure is done. Neuropathic pain has interventional options — nerve blocks, sympathetic blocks, spinal cord and peripheral nerve stimulation. They are often used exactly because medicines often work only partly. Nociplastic pain is generally not fixed by a procedure alone. Still, a nociceptive or neuropathic piece that exists alongside it may be worth treating. Learn more: How an epidural steroid injection works.
Dr. Gurpreet Singh Padda, MD, MBA, MHP
