You had the operation. The surgeon says it went well. The wound has closed, the follow-up scan looks fine, and everyone around you is expecting you to be back on your feet. Months later, though, the pain is still there, sometimes exactly where it started, sometimes somewhere new.
If this sounds familiar, you are not imagining it, and you have not failed to heal properly. Pain that outlasts the expected recovery from surgery is a recognised, well-studied medical condition with its own name: chronic post-surgical pain (CPSP). It is not a personal weakness or a sign that something was done wrong. It has identifiable causes, a defined diagnostic pathway, and treatments that can help.
What counts as normal recovery pain?
After most operations, pain follows a fairly predictable pattern, that is associated with tissue healing times: it is at its worst in the first few days, when there is lots of inflammation. It then gradually eases over the following weeks as tissue repairs itself. Swelling settles, movement becomes easier, and reliance on strong pain medication drops away.
How long this takes varies enormously and depends on multiple factors. A small hernia repair may feel back to normal within a few weeks. A spinal fusion, a hip replacement, or major chest surgery can reasonably take several months before things feel settled. There is no single universal deadline for “normal” recovery but tissue healing times give us good guidelines. For most surgery that only involves soft tissue (skin, muscle, ligaments) the healing time is typically 6-8 weeks, while the healing time for any surgery involving bone is about double that.
What matters far more than any calendar date though, is the trend. Normal recovery pain should be gradually and steadily improving, even if slowly. It is when pain plateaus, worsens, or changes character, rather than simply taking “a while”, that it's worth taking seriously.
When does pain after surgery become "chronic"?
Clinically, chronic post-surgical pain is defined as pain that develops or increases after a surgical procedure and persists beyond the normal healing period, most commonly set at three months. The pain has to be linked to the surgical site or the area supplied by nerves that run through it. Importantly, other causes of pain, such as infection, a recurrence of the original problem, or a separate new condition, need to be ruled out first.
International pain research bodies estimate that, depending on the type of operation, 10–50% of surgical patients will experience some degree of persistent pain, and that it is significant enough to affect quality of life in roughly 2–10% of patients overall. Across studies looking at pain at six to twelve months after surgery, the median figure sits at around 20–30%. This is a common, and often under-recognised complication of surgery.
Why Does Pain Persist After the Tissue Has Healed?
It can feel deeply confusing when a scan or examination shows that everything has healed, yet the pain hasn't resolved and may even have gotten worse. Several overlapping mechanisms explain this:
● Nerve injury or irritation during the procedure. Small nerves are often cut, stretched, or trapped in scar tissue during surgery. Injured nerves can continue firing danger signals long after the incision itself has healed.
● Sensitisation of the nervous system. An intense or prolonged period of postoperative pain can leave the spinal cord and brain in a more reactive state. This is a process called central sensitasition, where the nervous system keeps amplifying danger signals even once tissue damage has resolved.
● Scar tissue, adhesions, and altered movement patterns. As tissue remodels, it can pull on surrounding structures or restrict normal movement, changing the way you move and load the area, which itself can generate ongoing discomfort.
● Inflammation that never fully resolves. The same inflammatory chemicals that drive normal acute healing can, in some people, remain active for longer than expected, feeding both peripheral and central sensitisation.
Which surgeries carry a higher risk?
Some operations are more strongly associated with chronic post-surgical pain than others, largely because of the amount of nerve tissue involved and the extent of the dissection required:
● Knee and hip replacement: reported rates vary widely across studies, but persistent pain affecting daily life is seen in roughly 10–20% of patients in the first two years, most often in knee replacement.
● Hernia repair: even though it's considered a “minor” operation, ongoing pain of some degree is reported by up to around a third of patients, with a smaller proportion experiencing pain severe enough to interfere with daily function.
● Breast and thoracic surgery: these carry some of the highest rates, with studies reporting persistent pain in roughly a quarter, to over half of patients after mastectomy or breast cancer surgery, and around a third to half after thoracotomy.
● Spinal surgery: a meaningful proportion of patients continue to have significant back or leg pain after one or more operations, sometimes referred to as failed back surgery syndrome or persistent spinal pain syndrome.
It's important to understand that a higher statistical risk for developing chronic post-surgical pain after a particular surgery does not mean a poor outcome is inevitable. The majority of people who have these operations go on to recover well. Risk simply means it's worth knowing what to watch for.
What does chronic post-surgical pain feel like?
CPSP doesn't always feel like ordinary “sore” pain. Because nerve involvement and sensitisation are so often part of the picture, patients frequently describe:
● Burning, shooting, or electric-shock-like sensations, suggesting nerve involvement
● Numbness, tingling, or unusual sensitivity to light touch around the scar
● A dull ache or stiffness that returns predictably with activity
● Flares that seem to track with weather changes, stress, poor sleep, or fatigue
Are some people more likely to develop It?
Research has identified several factors that increase the likelihood of developing CPSP.
● Higher levels of pain at the surgical site in the weeks before the operation
● A pre-existing chronic pain condition elsewhere in the body
● Significant anxiety, low mood, or poor sleep around the time of surgery. A meta-analysis of surgical patients found a consistent link between higher preoperative anxiety and a greater likelihood of chronic pain afterwards
● Very intense pain, or early nerve-type symptoms, in the first days after the operation
These are best understood as modifiable risk factors. Addressing anxiety, sleep, and pain control before an operation are some of the evidence-based ways to reduce the chance of CPSP developing in the first place.
How is chronic post-surgical pain diagnosed?
There is no single blood test or scan that confirms CPSP. Diagnosis relies on a careful, structured clinical process:
● A detailed history of the operation itself and exactly how the pain has evolved since - its onset, character, and pattern
● A physical and neurological examination, including careful assessment of the scar and surrounding tissue for altered sensation
● Ruling out other explanations, such as infection, loosening or failure of any surgical hardware, or a new and unrelated condition
What treatment options are available?
The most encouraging evidence around CPSP is that it responds well to treatment, if the right combination of approaches is used. No single therapy works for everyone, but the following, used together, offer the best outcomes:
● Medication targeted at nerve pain, rather than standard anti-inflammatories or opioids alone, since much of CPSP has a neuropathic component
● Targeted injections and nerve blocks, including scar infiltration and diagnostic or therapeutic nerve block procedures, both to confirm the nociceptive source and to interrupt the signal directly
● Physiotherapy, graded movement, and scar desensitisation, since carefully progressed activity helps retrain an oversensitive nervous system.
● Psychological support, to interrupt the pain–stress–guarding cycle that keeps the nervous system on high alert, and to build confidence in moving and functioning again
Evidence consistently shows that combining approaches outperforms relying on any single treatment. This is also true in prevention: research on medications given around the time of surgery shows that agents such as intravenous lidocaine, ketamine, and gabapentinoids, can each modestly reduce the risk of chronic pain developing, particularly when used as part of a broader, multimodal anaesthetic and rehabilitation plan, rather than in isolation.
Can anything be done before surgery to prevent CPSP?
If you know you have an operation coming up, or are supporting someone who does, there is an opportunity to reduce the risk of CPSP. This is the idea behind prehabilitation: optimising your pain control, sleep, general conditioning, and expectations in the weeks leading up to surgery, rather than waiting to react once problems appear.
Because preoperative anxiety and unmanaged pain are two of the strongest known risk factors for CPSP, addressing them proactively through education, gentle conditioning, and psychological preparation, gives the nervous system the best possible starting point for recovery.
When should you ask for a specialist review?
It's reasonable to seek a dedicated pain assessment if, three months or more after surgery, any of the following apply:
● Pain is still limiting your day-to-day function
● You're experiencing nerve-type symptoms such as burning, numbness, tingling, or electric-shock sensations
● You find yourself needing more pain medication over time, rather than less
● Pain is disrupting your sleep, your mood, or your ability to return to work or normal activities
It is useful to consult with your surgeon first, to exclude any other explanations, but if your surgeon is happy with the surgical outcome and you still have pain, then consulting with a practitioner who has a special interest in pain management may be helpful.
Pain that outlasts healing deserves its own diagnosis
If your body has healed after surgery, but the pain hasn't, you may be presenting with chronic post surgical pain. This is a recognised clinical diagnosis with a name, a set of causes, and hopeful treatment pathways. Chronic post-surgical pain is common, it is real, and for most people it is manageable with the right, multidisciplinary approach.
You don't need to wait it out to see if it eventually fades. If your pain after surgery isn't following the recovery you were expecting, it may be worth consulting with a healthcare provider with a special interest in chronic pain.
Frequently asked questions:
Why do I still have pain months after surgery?
In most people, pain settles steadily as tissue heals. When pain persists beyond three months, it is usually being driven by nerve irritation, a sensitised nervous system, scar tissue, or unresolved inflammation, rather than by ongoing tissue damage. This is called chronic post-surgical pain and it is a recognised, treatable condition.
How long should pain last after surgery?
This varies by procedure, but pain should follow a clear trend of gradual improvement over weeks to a few months. There is no single fixed deadline, but pain that plateaus, worsens, or changes character rather than steadily easing is worth having assessed.
What is chronic post-surgical pain?
Chronic post-surgical pain (CPSP) is pain that develops or increases after an operation and persists beyond the expected healing time, usually defined as three months, once other causes such as infection or recurrence have been excluded.
Is nerve pain after a knee replacement normal?
Some burning, tingling, or numbness around the scar is common in early recovery, but persistent nerve-type pain beyond three months should be assessed, as it may indicate nerve irritation or sensitisation that may respond well to targeted treatment.
What can be done about pain after hernia repair that won't go away?
Persistent pain after hernia repair is often linked to irritation of small nerves in the area. A thorough assessment may identify treatment targets.