Heart surgery scar pain is remarkably common, affecting roughly a third of people who undergo open-heart procedures via sternotomy. The pain can linger for months or years, and it rarely has a single cause. What most people experience is some combination of nerve injury, bone healing issues, hardware irritation, scar tissue behavior, and changes in posture and muscle use. The frustrating part is that doctors sometimes struggle to pin it down to one culprit, because several of these mechanisms often overlap in the same person.
How Common the Problem Actually Is
Post-sternotomy pain syndrome, sometimes abbreviated PSPS, is defined as pain that persists for at least two months after open-heart surgery without a clear alternative explanation like infection. A systematic review and meta-analysis pooling data from multiple studies found that the overall prevalence sits at about 33%.1Anesthesiology and Pain Medicine. Global Prevalence Post-Sternotomy Pain Syndrome (PSPS) after Cardiac Surgery: Systematic Reviews and Meta-Analyse That means roughly one in three people who have their chest opened for heart surgery will deal with ongoing pain at or near the scar. Other research places the figure at around 30% with pain persisting along the sternal scar and sometimes radiating to the upper extremities, occasionally accompanied by tingling or numbness.2Pain Medicine. Pain Symptoms Accompanying Chronic Poststernotomy Pain: A Pilot Study Over two million sternotomies are performed worldwide each year, so this is not a niche problem.3Dovepress / Journal of Pain Research. Post-sternotomy pain syndrome following cardiac surgery: case report
The exact cause remains elusive in many cases, and researchers have acknowledged for years that the etiology is not fully understood. What is clear is that the pain is real, it is not “just anxiety,” and it involves a web of overlapping mechanisms rather than one simple explanation.
Nerve Damage From the Surgery Itself
One of the best-documented contributors to scar pain after heart surgery is direct injury to the intercostal nerves, the small nerves that run along the underside of each rib. During sternotomy, metal retractors pry the chest open wide enough for surgeons to work on the heart. That forceful spreading compresses and stretches the nerves, sometimes causing a complete conduction block. Research using nerve conduction testing found that both pressure and stretch from metal retractors damage the nerve fibers responsible for sensation, which explains why so many patients report numbness, tingling, or burning around their scar.4European Journal of Cardio-Thoracic Surgery. Assessment and follow-up of intercostal nerve damage after video-assisted thoracic surgery
When surgeons harvest the internal thoracic artery (also called the internal mammary artery) to use as a bypass graft, the risk of nerve injury jumps further. One study found definite anterior intercostal nerve damage on the side of harvesting in about 73% of patients, and all of those patients recalled prolonged pain or uncomfortable sensations after surgery. About 15% of the patients with confirmed nerve damage still had persistent chest wall pain five months to over two years later.5The Annals of Thoracic Surgery. Anterior intercostal nerve damage after coronary artery bypass graft surgery with use of internal thoracic artery graft That said, mammary artery harvesting is not the whole story. A prospective study found no statistically significant difference in chronic pain rates between different cardiac procedures, suggesting that other factors beyond artery harvesting also contribute.6PubMed. The incidence of chronic post-sternotomy pain after cardiac surgery–a prospective study
The nerve pain tends to have a distinctive character: burning, shooting, or electric-shock sensations, sometimes triggered by light touch on or near the scar. If your scar pain feels more like that than a deep ache, nerve damage is likely playing a role.
When the Breastbone Does Not Heal Properly
A standard sternotomy involves sawing the breastbone (sternum) in half, then wiring it back together at the end of surgery. Most of the time the bone knits together well, but incomplete healing or frank nonunion does happen and can be a significant source of ongoing pain. Pain and clicking at the sternum are among the most common complaints that bring these patients back to their surgeon.7PubMed Central. Late complications of chest wall reconstruction: management of painful sternal nonunion
A study that used CT scans to examine sternal healing found that patients with a gap wider than 3 millimeters had significantly higher chest pain intensity than those whose bone healed completely or had only a minor gap. When the dehiscence (incomplete closure) spanned more than one segment of the sternum, pain intensity climbed even further, and shoulder pain worsened too.8Thieme Connect / Thoracic and Cardiovascular Surgeon. Chronic poststernotomy pain after cardiac surgery: correlation of computed tomography findings on sternal healing with postoperative chest pain If your pain worsens when you cough, sneeze, twist, or press on the breastbone, a bone-healing problem may be part of the picture.
Sternal Wires and Hardware Irritation
The steel wires used to close the sternum are meant to stay put permanently, but they do not always sit quietly. Over time, wires can shift, protrude, or irritate surrounding tissue. In one case report, a woman developed pain at the lower end of her sternotomy scar a full twelve years after her original surgery. Examination revealed a palpable wire poking up beneath the skin, with visible discoloration above it.9PubMed Central. Patient-Related Progression of Steeper Sternal Wire Angles: A Case Report
Persistent post-sternotomy pain has also been linked to hypersensitivity reactions to the wire material, irritation of the sternal bone itself, inflammation of the rib cartilage (costochondritis), and nerves becoming trapped in scar tissue near the wires.10Journal of the Egyptian Society of Cardio-Thoracic Surgery. Persistent post sternotomy chest pain: Does sternal wire removal have a role? When wires are suspected as the culprit, removal can help. A study of patients who had their sternal wires taken out for persistent pain found that about 86% reported complete or partial symptom relief afterward. In cases where pain seemed related to specific wires, removing only those wires worked just as well as removing all of them.11PubMed. The outcome of sternal wire removal on persistent anterior chest wall pain after median sternotomy Wire removal was more common in patients with a history of allergies, suggesting that metal sensitivity may be a real mechanism in some people.
Rigid plate fixation, an alternative to traditional wires, appears to cause less early pain. A randomized trial comparing plates to wires found significantly lower pain scores in the plate group at three weeks, particularly with coughing and sneezing.12PubMed. Sternal closure with rigid plate fixation versus wire closure: a randomized controlled multicenter trial Plates are not used universally, but the evidence suggests that the closure method itself can influence how much pain you deal with down the road.
Scar Tissue and Skin Tension
The scar itself is not just a cosmetic mark. Sternotomy scars sit along the midline of the chest where skin tension is high, and that tension promotes thicker, more abnormal scar tissue. Keloids and hypertrophic scars, the raised, ropy types that extend beyond or remain elevated at the wound line, are a recognized complication of midline chest incisions.13Plastic and Reconstructive Surgery. Older Patients and Patients with Severe Arteriosclerosis Are Less Likely to Develop Keloids and Hypertrophic Scars after Thoracic Midline Incision: A Survey-Based Analysis of 328 Cases These abnormal scars can be itchy, tender, and genuinely painful. Younger patients and those without severe arterial disease appear more prone to developing them.
Even when a scar looks reasonably flat and well-healed on the surface, deeper adhesions can form where the scar tissue binds to the underlying bone, muscle, or fascia. Those adhesions restrict movement and pull on surrounding structures during everyday activities like reaching overhead, twisting, or taking a deep breath. Treatment for problematic scars ranges from silicone sheeting and pressure garments to steroid injections and, in some cases, surgical revision.14PubMed Central. Management of keloid and hypertrophic scars
Postpericardiotomy Syndrome
Not all chest pain after heart surgery originates from the scar or the bone. Postpericardiotomy syndrome, or PPS, is an inflammatory reaction that affects the pericardium, the sac surrounding the heart. It is believed to result from an immune-mediated response to injury of the heart and pericardium during surgery, leading to inflammation, fluid buildup around the heart, and sometimes fluid around the lungs as well.15PubMed Central. Evaluation and Management of Post-Cardiotomy Syndrome The classic presentation includes fever, sharp chest pain that worsens with deep breathing, and elevated blood markers of inflammation. It typically shows up days to weeks after surgery, though it can recur later.
PPS is diagnosed when a patient develops at least two of the following: new or worsening fluid around the heart, new or worsening fluid around the lungs, pleuritic chest pain, fever, or elevated inflammatory markers without another explanation.16PubMed Central. Predictors of post-pericardiotomy syndrome after native valve-sparing aortic valve surgery This is an important distinction because PPS pain can feel like it is coming from the scar when it is actually coming from deeper inside the chest. It is treatable, usually with anti-inflammatory medication, so getting it diagnosed matters.
Infection as an Underappreciated Cause
Most people think of wound infection as something that would be obvious, with redness, swelling, and fever. But low-grade sternal osteomyelitis, an infection of the bone itself, can be sneaky. It sometimes presents with little more than persistent bone pain, tenderness, and intermittent fevers that come and go. It can be mistaken for the more common post-sternotomy pain syndrome or even for cardiac problems like pericarditis.17Elsevier / International Journal of Surgery Case Reports. Primary sternal osteomyelitis: A case report If your scar pain is accompanied by warmth, swelling, or recurrent fevers, particularly weeks to months after surgery, infection should be ruled out even if the skin looks relatively normal.
Who Is Most Likely to Develop Chronic Pain
Certain people face a higher risk of developing persistent pain after heart surgery. Research has consistently identified several factors:
- Being female: Women have roughly double the odds of chronic thoracic pain compared with men.
- Younger age: Patients under 60 are at higher risk than older patients, possibly because younger nervous systems mount a stronger pain response.
- Higher body mass index: Obesity, particularly a BMI over 30, is repeatedly linked to worse post-sternotomy pain.
- Severe early pain: If you had intense pain in the first few days after surgery, your chances of it becoming chronic roughly triple.
- Non-elective surgery: Emergency or urgent operations carry about four times the risk of chronic pain compared with planned procedures.
- Reoperation: Having the sternum re-opened during the same hospital stay more than triples the risk.
These risk factors were identified through multivariate analysis, meaning they hold up even after accounting for other variables.18European Journal of Cardio-Thoracic Surgery. Risk factors for chronic thoracic pain after cardiac surgery via sternotomy Additional factors flagged in other studies include a history of previous coronary stenting, reduced heart function before surgery, and poor wound healing afterward.19PubMed. Incidence and Factors Associated With Post-Sternotomy Pain Syndrome in the National Heart Institute, Malaysia A recent meta-analysis added chronic pain history, intraoperative use of the short-acting opioid remifentanil, and moderate-to-severe pain in the first five days as significant predictors.20PubMed Central. Incidence and risk factors of persistent postoperative pain after cardiac surgery: a systematic review and meta-analysis
The Role of Depression and Psychological Factors
Your mental state before surgery has a measurable influence on how much pain you experience afterward. Patients with higher pre-operative depression scores reported significantly more intense pain than those with lower scores.21PubMed Central. Clinical factors and pre-surgical depression scores predict pain intensity in cardiac surgery patients This is not about pain being imagined. Depression alters how the nervous system processes pain signals, amplifying them. It also makes it harder to engage in rehabilitation, which creates a feedback loop: more pain leads to less movement, which leads to more stiffness and weakness, which leads to more pain.
The broader mechanism at work here is called central sensitization, where the spinal cord and brain become more reactive to pain signals over time. Chronic post-surgical pain after cardiac surgery involves a mix of peripheral nerve changes and these central nervous system adaptations, along with ongoing inflammatory pathways.22PubMed Central. Chronic postsurgical pain after cardiac surgery: A narrative review In plain terms, the pain system gets stuck in a heightened state. This helps explain why the pain can persist long after the tissues have healed structurally.
Posture Changes After Open-Heart Surgery
Something that rarely gets discussed with patients is how profoundly heart surgery changes posture. People instinctively protect their chest after sternotomy by hunching their shoulders forward and dropping their head. A prospective study of 73 patients measured head and shoulder position before and after surgery and found significant increases in forward head posture and forward shoulder angle by the time of hospital discharge, along with a meaningful drop in the strength of breathing muscles.23PubMed Central. A Prospective Study of 73 Patients to Compare Forward Head Angle, Forward Shoulder Angle, Maximal Inspiratory Pressure, and Self-Reported Breathing-Related Symptoms Before and After Open-Heart Surgery
This protective posture feels safer, but over weeks and months it creates strain in the neck, upper back, and shoulders. The muscles around the scar shorten, the chest wall becomes stiffer, and the scar tissue itself may tighten in its contracted position. Patients often attribute the resulting pain to their scar when it is actually driven by the postural compensation around it. Physical therapy focused on restoring upright posture, chest mobility, and breathing mechanics is one of the most underutilized tools for managing post-sternotomy pain.
What Can Be Done About It
Managing chronic scar and chest pain after heart surgery usually requires addressing more than one mechanism at once. On the medication side, nerve-targeting drugs like gabapentin or pregabalin are often tried for neuropathic pain, while anti-inflammatory medications may help with costochondritis or pericardial inflammation. For acute postoperative pain, regional nerve blocks have shown promise. A trial of parasternal intercostal nerve blocks as part of an enhanced recovery program after bypass surgery found that maximum pain scores dropped meaningfully and total opioid use fell by about 78%.24PubMed. Evaluation of an Enhanced Recovery After Surgery Protocol Including Parasternal Intercostal Nerve Block in Cardiac Surgery Requiring Sternotomy Pectoral nerve blocks also reduced pain scores for the first 18 hours after extubation and dramatically cut the need for rescue painkillers.25PubMed Central. Efficacy of Bilateral Pectoralis Nerve Block for Ultrafast Tracking and Postoperative Pain Management in Cardiac Surgery
When sternal wires are the suspected problem, removal is a reasonable option given the high rate of at least partial relief reported in studies. For patients with hypertrophic or keloid scarring, treatments include silicone products, corticosteroid injections, and occasionally laser or surgical revision. And for the postural and musculoskeletal components, hands-on physical therapy or osteopathic treatment can make a real difference. In one case, a patient who had undergone two cardiac surgeries saw pain drop from 7 out of 10 to 3 out of 10 after just four sessions of osteopathic treatment, with improved walking distance as well.26Elsevier / International Journal of Osteopathic Medicine. Effects of osteopathic treatments in a patient who underwent two cardiac surgeries – A case report
Does a Smaller Incision Mean Less Pain
With minimally invasive cardiac surgery growing in popularity, a natural question is whether a smaller cut means less suffering. The answer is somewhat, but with caveats. A comparison of full sternotomy versus mini-incision procedures found that on the third day after surgery, nearly all patients in both groups reported pain. By the seventh day, however, patients who had the smaller incision were significantly more likely to be pain-free, reported fewer painful areas, and experienced lower pain intensity that decreased over time. Patients with the full sternotomy, by contrast, showed no significant drop in pain intensity between the third and seventh days.27International Journal of Cardiovascular Sciences. Minimally Invasive Cardiac Surgery versus Sternotomy – Pain Investigation
A meta-analysis looking specifically at whether minimally invasive approaches produce less pain overall found mixed results depending on the type of procedure. For aortic valve replacement, the initial analysis favored the smaller incision, but that advantage disappeared once less robust studies were removed in a sensitivity analysis. For bypass surgery, neither approach came out ahead in terms of pain.28PubMed Central. Comparison of the Effects of Full Median Sternotomy vs. Mini-Incision on Postoperative Pain in Cardiac Surgery: A Meta-Analysis So while mini-incisions may offer a faster early recovery from pain, the long-term chronic pain picture is less clear-cut than you might expect. The type of procedure, how much retraction is needed, and whether an artery graft is harvested all seem to matter more than simply how long the cut is.
When Pain Returns Years Later
One of the more unsettling experiences is scar pain that resurfaces years after surgery when you thought the issue was resolved. This can happen for several reasons. Sternal wires gradually shift position over time due to weight changes, repetitive motion, or loss of bone density. The case of a wire protruding twelve years after surgery illustrates that hardware problems are not limited to the early recovery period.9PubMed Central. Patient-Related Progression of Steeper Sternal Wire Angles: A Case Report Post-sternotomy pain syndrome can also recur after long periods of being dormant, though the reason for these flares remains poorly understood.3Dovepress / Journal of Pain Research. Post-sternotomy pain syndrome following cardiac surgery: case report
New-onset pain at a healed sternotomy site also warrants a fresh workup. The differential diagnosis includes late sternal nonunion (the bone may have healed partially and then separated), new or recurrent costochondritis, pericardial inflammation unrelated to the original surgery, and, rarely, sternal infection. Late pain should not be dismissed as “just your scar acting up” without at least a physical examination and, when appropriate, imaging to check the integrity of the bone and hardware.