Scar tissue: the explanation that sounds right and usually isn't.

Your pain started after the surgery, so the scar must be the cause. It is a reasonable guess, and it is where most people get stuck.

This page is about understanding the condition and the role the brain and nervous system can play in it. It is not a diagnosis. Your own clinicians know your case.

What scar tissue is

Scar tissue is what the body builds to repair itself after an injury, accident or surgery. The original tissue is replaced largely by collagen, a tough, fibrous protein, which is why a scar feels firmer and less flexible than the skin or tissue around it. On the surface it may be thickened or raised. Inside the body, scar tissue can form bands called adhesions that connect structures which were previously separate, for example loops of bowel after abdominal surgery.

The neuroplastic contribution

The ATNS Index of Neuroplastic Symptoms says symptoms are often incorrectly attributed to scar tissue, which does not contain nerves, and that other reasons for the symptoms should be looked for, including neuroplastic symptoms. It points readers to its entry on adhesions, which makes the same point.

Neuroplastic symptoms are real physical symptoms produced by learned pathways in the brain and nervous system rather than by ongoing damage in the body. Surgery and injury are exactly the kind of events that can leave the nervous system sensitized: it learned that this region was under threat, and it kept the alarm on after healing was complete. The pain is real, often located right at the scar, and it is produced by the brain's protective map of the area, not by the collagen. That is not a dismissal; it is the explanation that fits the evidence, and it is the one that offers a way forward, because the brain can change. Our pages on adhesions, post-surgical pain and central sensitization cover related ground.

What the research shows

The best evidence comes from trials that tested the scar-tissue theory directly, by cutting adhesions and seeing whether pain improved.

In a blinded, randomized, multi-centre trial published in 2003, 100 patients with chronic abdominal pain attributed to adhesions had a laparoscopy. Half had their adhesions cut; half had the diagnostic look only, with no adhesions touched. Neither patients nor the doctors assessing them knew which group they were in. Both groups improved substantially in pain and quality of life, and there was no meaningful difference between them. The authors concluded that cutting adhesions was not effective. If the adhesions had been generating the pain, removing them should have helped more than leaving them alone.

A 2017 systematic review and meta-analysis of surgical treatment for adhesion-related chronic abdominal and pelvic pain found only two randomized trials and no significant long-term benefit from adhesiolysis over diagnostic laparoscopy. Observational studies reported better results, but without a comparison group those cannot separate the effect of surgery from the effect of expectation.

A 2026 updated meta-analysis pooled four randomized trials with 271 patients and again found no statistically significant difference in pain improvement between adhesiolysis and diagnostic laparoscopy alone (about 39 percent versus 36 percent). The authors concluded that the highest level of evidence does not show a clinically meaningful benefit of cutting adhesions.

Honest caveats: these trials are about internal abdominal adhesions, not every kind of scar, and the trials are few and have been criticised. But the pattern is consistent and it is the opposite of what the scar-tissue theory predicts. Notice also that patients in both arms improved: an operation they believed in changed their pain even when nothing was cut, which is itself a demonstration of the nervous system's role.

Signs the brain may be part of the picture

• Imaging and examination show a healed scar with no obstruction, hernia, nerve entrapment or infection.
• Pain at or around the scar has persisted long past the normal healing period, or began months after surgery.
• The pain spreads beyond the scar, moves, or appears in areas the surgery never touched.
• Scar massage, release techniques, injections or further surgery gave brief relief that faded.
• Pain flares with stress, fatigue or emotion rather than with physical loading of the area.

A solution that addresses it

There is an approach that addresses the brain's contribution to pain after surgery and injury. Pain and symptom reprocessing combines education about neuroplastic symptoms, somatic tracking (touching and attending to the scar region with curiosity and safety rather than fear), reducing threat, a graded return to movement and activity involving the area, emotional awareness and expression, and acceptance and commitment skills. It is delivered by trained clinicians and increasingly through digital programs. It does not require the scar to change at all, only the brain's interpretation of it.

Cindra is a daily AI companion built around these approaches, with daily check-ins, short practices and plain-language lessons for people whose symptoms have a neuroplastic component. If your scar has been taking the blame for too long, you can join the waitlist.

What to do next

First, make sure nothing else is going on. Have a clinician examine the area and, where appropriate, image it, to exclude hernia, infection, nerve entrapment, a retained problem from surgery, or, for abdominal scars, obstruction. Seek emergency care for severe abdominal pain with vomiting, a swollen belly and inability to pass wind or stool.

Second, if the scar is healed and nothing else is found, ask whether your pain fits a neuroplastic pattern. The signs above are a useful checklist. Be cautious about further procedures aimed at the scar itself; the trial evidence suggests they do not outperform doing nothing.

Third, start learning and practising. Begin with the exercise below, read about hurt versus harm, and return to movement with pacing. The scar has done its job; the task now is to convince the nervous system that the job is finished.

This article is for general education and is not medical advice, and it does not diagnose or treat any condition. Persistent symptoms deserve a proper medical assessment to rule out disease or injury before a neuroplastic explanation is considered. If your symptoms are new, changing, or come with red-flag signs such as fever, unexplained weight loss, numbness or weakness, chest pain, or loss of bladder or bowel control, see a clinician promptly.