Some degree of chest discomfort in the days following pacemaker implantation is expected, but the word “normal” does a lot of heavy lifting. Mild soreness around the incision site and the generator pocket is almost universal and typically fades within a few weeks. Chest pain that is sharp, worsening, or accompanied by fever, shortness of breath, or dizziness points to something that warrants urgent evaluation. The challenge for patients is that the line between routine post-surgical aching and a complication can feel blurry, and several distinct problems can all present as “chest pain.”
What Counts as Routine Discomfort
A pacemaker is implanted through a small incision just below the collarbone. The generator sits in a pocket created between the skin and the pectoral muscle (or sometimes beneath the muscle). Wires called leads are threaded through a vein into the heart. All of this involves cutting, tunneling, and anchoring hardware inside the body, so tenderness, bruising, and a dull ache around the pocket site are par for the course. Most people describe the first week or two as feeling like a deep bruise under the collarbone, and it commonly hurts more when raising the arm on that side or rolling onto the device in bed.
This kind of soreness is managed with over-the-counter pain relievers and usually resolves within two to four weeks. It is the closest thing to “normal” chest pain after a pacemaker. Anything that feels different from localized surgical-site tenderness deserves closer attention, because several less-common complications can masquerade as ordinary post-operative pain.
Pocket Hematoma
Blood can pool in the pocket where the generator sits, creating a swollen, painful lump. A pocket hematoma is defined as swelling that extends beyond the edges of the generator, sometimes with visible bruising on the overlying skin. Most pocket hematomas resolve on their own. Roughly one in ten, however, become clinically significant enough to require blood transfusion, surgical drainage, longer hospitalization, or a pause in blood-thinning medication.1PubMed Central. Risk Factors and Preventing Strategies of Pocket Hematoma After Cardiac Implantable Electronic Device Implantation: A Systematic Review Patients on anticoagulants are at higher risk. If the pocket area becomes progressively more swollen, tense, or painful in the hours and days after surgery, it is worth contacting your care team rather than assuming it will settle.
Pericarditis After Implantation
Pericarditis, an inflammation of the thin sac surrounding the heart, is one of the more distinctive causes of chest pain after pacemaker placement. The pain is typically sharp, worse with deep breathing or lying flat, and sometimes relieved by sitting up and leaning forward. It can show up anywhere from hours to a few weeks after the procedure.
How common is it? In a review of about 400 implantations, roughly 2% of patients developed pericarditis afterward, with symptoms resembling post-pericardiotomy syndrome: chest pain in nearly every case, sometimes accompanied by fever, fatigue, and fluid around the heart visible on echocardiogram.2PubMed. Pericarditis following permanent pacemaker insertion A separate study of over 1,000 patients found a much higher rate among those who received active-fixation atrial leads, which screw into the heart wall to hold position. About 5% of patients with that lead type developed pericarditis, compared to zero among those with passive-fixation leads or ventricular-only leads. In three of those four cases, treatment with aspirin or ibuprofen resolved symptoms within about a week. One patient died of cardiac tamponade six days after the procedure, underscoring why post-implant pericarditis should be taken seriously even though it usually resolves with anti-inflammatory medication.3PubMed. Postpacemaker implant pericarditis: incidence and outcomes with active-fixation leads
The takeaway is that sharp, breathing-related chest pain developing in the first days or weeks after a pacemaker should prompt a call to your cardiologist. Pericarditis is treatable, but left unchecked it can occasionally progress to dangerous fluid accumulation around the heart.
Lead Perforation and Migration
The leads that carry electrical signals between the pacemaker and the heart are thin and flexible, but they sit inside a beating organ. Rarely, a lead tip can push through the heart wall. This complication is uncommon but potentially life-threatening. In one reported case, a patient returned to the emergency department the day after pacemaker placement with chest pain; imaging showed the ventricular lead had perforated the right ventricular wall, requiring emergency surgery for lead replacement and repair of the ventricle.4PubMed Central. Pacemaker Lead Migration and Ventricular Perforation in a Patient Presenting with Chest Pain
When an atrial lead perforates, it can poke into surrounding structures. One case documented an atrial lead screw that had pushed through the right atrial wall and embedded itself in the adjacent lung tissue, causing both a pneumothorax (air leaking around the lung) and air inside the pericardial sac.5BMJ Case Reports CP. Chest pain following permanent pacemaker insertion… a case of pneumopericardium due to atrial lead perforation Another report described a similar mechanism in which the screw-in tip of an atrial lead extruded through the right atrial appendage and was abutting a blister on the lung surface, producing both pneumothorax and pneumopericardium on the opposite side of the chest from where the pacemaker was implanted.6EP Europace. Pneumopericardium and pneumothorax contralateral to venous access site after permanent pacemaker implantation
These cases are rare enough to be written up individually in medical journals, which gives you a sense of how uncommon they are. But they illustrate why sudden, severe chest pain or sudden shortness of breath after a pacemaker should never be brushed off. Lead perforation is diagnosed with chest X-ray and CT scan, and treatment usually involves surgical intervention.
Pacing-Induced Chest Pain
Sometimes the chest pain has nothing to do with the surgical wound or a mechanical complication of the leads. The pacemaker itself, doing exactly what it was designed to do, can cause discomfort by changing the pattern in which the heart contracts.
One well-documented scenario is pacemaker-mediated angina. In a case involving a 78-year-old man who developed chest pain shortly after receiving a dual-chamber pacemaker, the pain was traced to the way the device was pacing the ventricle. When the pacing mode was switched so the ventricle was no longer being paced in lockstep with atrial tracking, his pain resolved immediately. The culprit was angina: the altered pacing pattern increased the heart’s oxygen demand in a way that provoked ischemic pain.7PubMed Central. Pacemaker-mediated angina This kind of problem is more likely in patients who already have coronary artery disease.
A related but distinct mechanism involves ventricular dyssynchrony. When a pacemaker stimulates the ventricle from a single point (typically the right ventricular apex), the two sides of the heart contract in a slightly lopsided sequence rather than the more synchronized pattern the heart’s own conduction system produces. In some patients this creates a sensation of chest tightness or discomfort. Researchers have reported that switching to His-bundle pacing, which activates the heart’s natural wiring, can eliminate this type of pain.8PubMed Central. His-bundle pacing to treat an unusual case of chest pain after pacemaker implant If you develop a vague aching or pressure in the chest that does not seem related to the incision and does not behave like pericarditis, it is worth asking your electrophysiologist whether the pacing settings could be contributing.
Diaphragmatic and Muscle Twitching
Not all pacemaker-related chest sensations are pain in the traditional sense. Some patients feel rhythmic twitching or fluttering in the chest wall or upper abdomen. This happens when electrical impulses from the pacemaker inadvertently stimulate nearby muscles or nerves. The pectoral muscles, intercostal muscles, and the diaphragm can all be affected.9OSP Journal of Case Reports. Right Hemi-Diaphragmatic Twitching: A Case of Atrial Lead Displacement into the Superior Vena Cava and Review of Literature
In some cases, the right phrenic nerve, which runs near the right atrial appendage where atrial leads are often placed, gets stimulated with each pacing pulse, causing the diaphragm to twitch in sync with the heart rate.10PubMed Central. Sudden onset pacemaker-induced diaphragmatic twitching during general anesthesia Patients often describe this as a hiccup-like sensation or a rhythmic thump in the chest or belly. It is usually more annoying than dangerous, but it can signal that a lead has shifted out of position. The fix may be as simple as reprogramming the pacemaker’s output voltage downward, or it may require lead repositioning if the lead has truly migrated.
Infection at the Device Pocket
Chest pain that is accompanied by redness, warmth, swelling, or drainage around the incision site raises the possibility of infection. In a study of over 120 patients with device-related infections (including both pacemakers and defibrillators), the most common signs were redness and local pain at the pocket site.11PubMed. Diagnosis and management of infections involving implantable electrophysiologic cardiac devices Device infections can appear in the first few weeks after implantation or months to years later. Early infections tend to present with obvious pocket inflammation. Late infections sometimes involve the leads themselves and can spread to the heart valves, making them harder to diagnose.
Any fever, increasing redness, or pus at the wound in the weeks after surgery should be evaluated promptly. Device infections almost always require removal of the entire system rather than antibiotics alone, so catching them early matters.
Vascular Complications
The leads run through veins on their way to the heart, and the presence of foreign material inside a vein raises the risk of blood clots. Upper extremity deep venous thrombosis can develop in the subclavian, axillary, or more distal arm veins on the side of the pacemaker. One case report documented an 88-year-old man who developed clots in multiple veins of his left arm shortly after dual-chamber pacemaker implantation.12PubMed Central. A Case of Multiple Vein Thrombosis Following Pacemaker Implantation Symptoms of venous thrombosis in this setting include swelling, pain, and a heavy feeling in the arm on the pacemaker side, sometimes with visible distension of surface veins. If a clot breaks loose, it can travel to the lungs and cause a pulmonary embolism, which presents as sudden chest pain, shortness of breath, and rapid heart rate. Arm swelling on the device side should not be dismissed as just post-surgical swelling if it develops or worsens days after the procedure.
Shoulder Stiffness and Movement-Related Pain
A surprising number of pacemaker patients develop restricted shoulder movement on the side of their device. A study using objective measurements found that pain, the physical association of the device with the pectoral muscles, and patients’ conscious or unconscious guarding of the arm all contributed to limited range of motion and reduced shoulder function.13International Journal of Rehabilitation Research. Limitation of motion and shoulder disabilities in patients with cardiac implantable electronic devices Many patients are told to limit arm movement for a few weeks after implantation to prevent lead dislodgement, and some continue restricting movement long after the leads have settled, developing a stiff shoulder that can itself cause chest wall and upper-body pain.
Gentle, progressive mobilization of the shoulder after the initial healing period, guided by your clinical team’s instructions, helps prevent this cycle of guarding and stiffness. If your chest or shoulder pain worsens with specific movements months after the procedure, a frozen or stiff shoulder may be the culprit rather than the pacemaker itself.
Allergic Reactions to Device Components
This is a genuinely rare cause of chest and pocket-area discomfort, but it catches patients off guard because they rarely think of a medical device as something they could be allergic to. Pacemaker generators and leads contain metals like titanium and nickel, along with materials like epoxy resin. In susceptible individuals, these can trigger a delayed hypersensitivity reaction. Case reports have documented redness around the pacemaker pocket, wound breakdown, and chronic granulomatous inflammation confirmed on biopsy.14PubMed Central. Allergic reaction to pacemaker compounds: Case reports In one case, a patient developed erythema and wound dehiscence about two weeks after suture removal, with no signs of infection. The explanation turned out to be a type IV allergic reaction to the device materials.
If the pocket area remains persistently red, irritated, or weepy despite negative cultures for infection, an allergy to the device components is worth considering. The usual solution is replacing the device with one made from different materials, which obviously involves another procedure.
When to Call Your Doctor Versus Going to the ER
The sheer number of possible causes makes it useful to have a mental framework for urgency. Not every chest sensation after a pacemaker requires a trip to the emergency department, but some definitely do.
- Emergency (call 911 or go to the ER): Sudden severe chest pain, sudden shortness of breath, feeling faint or passing out, rapid swelling of the arm or neck on the device side, or signs of a stroke.
- Same-day call to your cardiologist: New sharp pain that worsens with breathing or lying down (possible pericarditis), increasing redness or swelling at the pocket with fever, rhythmic twitching in the chest or diaphragm, or a feeling that the pacemaker has shifted under the skin.
- Mention at your next visit: Mild, stable soreness at the incision site, occasional pulling sensation when raising the arm, or a general sense of awareness of the device under the skin without worsening pain.
Err on the side of contacting your team. Electrophysiologists and device clinics are used to fielding calls from patients in the weeks after implantation, and a quick device interrogation can reveal a lot about whether leads are in position, whether the pacing thresholds have changed, and whether the device is functioning as intended.
Leadless Pacemakers and Reduced Post-Procedure Pain
The landscape is changing. Leadless pacemakers are small capsule-shaped devices implanted directly inside the heart through a catheter in the leg, eliminating the chest incision, the subcutaneous pocket, and the transvenous leads entirely. A multicenter observational study comparing conventional and leadless pacemakers found that patients who received leadless devices reported significantly less procedure-related discomfort, fewer physical restrictions, and less preoccupation with the device.15Wiley Online Library. Quality of life of patients undergoing conventional vs leadless pacemaker implantation: A multicenter observational study That makes intuitive sense: no chest wound means no pocket pain, no shoulder guarding, and no lead-related mechanical complications like perforation or dislodgement.
Leadless pacemakers are not suitable for every patient. Current models work only for certain pacing needs, and they come with their own set of potential complications related to the femoral vein access and the anchoring mechanism inside the heart. But for candidates who qualify, the near-elimination of post-implant chest pain is a meaningful quality-of-life advantage. If you are being evaluated for a pacemaker and chest-area discomfort is a concern, asking whether a leadless device is an option for your situation is a reasonable conversation to have with your electrophysiologist.