Pacemakers can cause breast pain, and the discomfort takes several forms depending on its underlying cause. Pain around the implant site is one of the most frequently reported complaints after a cardiac device procedure, and because pacemakers are typically placed just below the collarbone on the left side, the pain often radiates into or is perceived within the breast. The reasons range from straightforward surgical soreness to rarer complications like lead perforation through the heart wall, and some of them deserve urgent medical attention.
Pain in the Days After Implantation
The most common reason for breast or chest pain after getting a pacemaker is the surgery itself. A pacemaker is placed inside a small pocket carved into tissue beneath the skin, usually just below the collarbone. The pocket sits either above or beneath the pectoral muscle. That muscle connects directly to the chest wall and overlaps with breast tissue, so post-operative swelling, bruising, and tenderness in the area routinely produce sensations that patients describe as breast pain.
A retrospective study of 322 patients found that pain after pacemaker or defibrillator implant surgery remains a real problem in terms of both how severe it gets and how long it lingers, with a subset of patients experiencing pain that persists well beyond the expected healing window.1PubMed Central. Pain after pacemaker/ICD implants Most people feel meaningful improvement within a few weeks, but the fact that a recognizable subset does not is worth knowing about early on.
Occasionally, bleeding around the surgical site creates a hematoma, a collection of blood that swells and presses on surrounding tissue. One documented case involved a patient who developed a large hematoma measuring roughly 8 by 12 by 11 centimeters in the pectoral muscle area within hours of surgery, causing pain, nausea, and a dangerous drop in blood pressure.2PubMed Central. Retropectoral hematoma: A rare complication following biventricular implantable cardiac defibrillator upgrade Hematomas that large are rare, but smaller ones that produce localized breast or chest pain are more common and usually resolve on their own.
Chronic Pocket Pain
When pain sticks around for months or even years, the pacemaker pocket itself is often the culprit. The device sits in a small fibrous capsule that forms around it after surgery, and over time the generator can press against skin, fascia, or nerve endings in ways that create a grinding, aching, or burning sensation. One theory is that the device gradually erodes through the fatty tissue beneath the skin, bringing it closer to the surface and making the area more sensitive to pressure and movement.3Anaesthesia & Surgery Open Access Journal. Chronic Pacemaker Pocket Pain Treated Successfully with A Pectoralis Nerve Block
Thin patients are especially vulnerable. When there is not much tissue between the device and the skin, the pacemaker pushes outward with every arm movement or even just from lying on that side at night. In extreme cases, the device can actually erode through the skin surface. Some patients have had tissue grafts placed over their pacemakers to add a cushioning layer and relieve that pressure.4Pacing and Clinical Electrophysiology. Reduction of pacemaker pressure symptoms using nonantigenic preserved human dermis grafts
The character of chronic pocket pain often has both a muscular and a nerve component. One case report described a patient suffering from severe myofascial pain worsened by the pacemaker, combined with a neuropathic burning sensation over the pocket site. A nerve block targeting the pectoral nerves gave that patient complete pain relief and restored full shoulder range of motion, though the relief lasted about five to six months before the pain returned.3Anaesthesia & Surgery Open Access Journal. Chronic Pacemaker Pocket Pain Treated Successfully with A Pectoralis Nerve Block That mixed-pain picture helps explain why chronic pocket pain can feel so different from person to person and why it does not always respond to simple painkillers.
When a Pacemaker Lead Perforates the Heart
This is the complication that sounds alarming because it is. Pacemaker leads are thin wires threaded through a vein into the heart, where their tips make contact with the heart wall to deliver electrical impulses. Rarely, a lead tip pushes through the heart wall entirely. This perforation can happen right away, days later, or even weeks to months after implantation.
The symptom that brings patients in is often surprisingly vague. In one case, a 74-year-old woman’s only complaint was a tingling sensation in her left breast. Imaging confirmed that her pacemaker lead had perforated the right ventricle.5PubMed Central. Right Ventricular Perforation Presenting as Tingling of the Left Breast In another case, a patient returned to the emergency department eight days after implantation with moderately severe left chest pain and significant bruising, and imaging confirmed that the lead had migrated and perforated the heart.6PubMed Central. Delayed pacemaker lead perforations: Why unusual presentations should prompt an early multidisciplinary team approach
The reason breast pain or tingling can signal lead perforation is anatomy. When a lead pushes through the muscular wall of the heart, it can irritate the pericardium, the thin sac surrounding the heart, and nearby structures including the diaphragm and chest wall nerves. That irritation gets referred to the front of the chest, and patients with left-sided pacemakers often localize it to the breast. The takeaway here is practical: new or unusual breast sensations after pacemaker placement, even something as mild as tingling, deserve a call to your cardiologist.
Infection Around the Device
Infection of the pacemaker pocket is an uncommon but serious cause of pain. When bacteria colonize the tissue around the device, the area becomes red, swollen, warm, and tender. In advanced cases, the infection can erode through the skin. One unusual case involved a patient who developed a simultaneous breast and pacemaker pocket infection caused by Brucella bacteria, presenting with erythema, firmness, tenderness over the left chest wall, and visible skin erosion over the device.7IDCases. Simultaneous Brucella breast and pacemaker infection
Most pacemaker infections are caused by common skin bacteria introduced at the time of surgery rather than exotic organisms. Symptoms typically develop within weeks to months of the procedure, though late infections happen too. Fever, increasing redness, drainage from the incision site, and worsening tenderness are all red flags. Treatment almost always requires removing the entire device and leads, treating the infection with antibiotics, and eventually reimplanting a new system on the opposite side of the chest.
Device Migration and Twiddler’s Syndrome
Pacemaker generators are not bolted to bone. They sit inside a soft tissue pocket and are held in place mostly by the fibrous capsule that forms around them. Sometimes the device shifts position. In thin patients or those with loose connective tissue, the generator can migrate downward toward the breast. In more dramatic cases, patients unconsciously fiddle with the device through their skin, a phenomenon called Twiddler’s syndrome. This manipulation causes the leads to retract and coil inside the pocket, and the generator itself may rotate or shift significantly.8PubMed Central. A Case of Twiddler’s Syndrome: A Rare Complication of Pacemakers
When a device migrates into or near breast tissue, it can cause localized pain, a palpable lump, and skin changes. One striking case involved a 59-year-old woman who noticed bilateral breast masses over three months. Examination revealed skin dimpling in the upper part of her left breast that looked like it could be breast cancer. Imaging showed it was actually her cardiac device, which had migrated into the glandular tissue of the breast.9Radiology Case Reports. Unusual migration of implantable cardioverter defibrillator that clinically mimicking breast cancer: A case report That case underscores the importance of mentioning your pacemaker to any doctor evaluating breast symptoms, since even experienced clinicians can initially mistake a migrated device for something else entirely.
Why Women May Notice It More
Pacemaker discomfort in and around the breast disproportionately affects women for several anatomical reasons. The standard implant site sits directly above or adjacent to breast tissue, and in women with smaller frames the device can be more prominent. The device pocket’s proximity to the breast means that swelling, capsule tightening, or even normal arm movements can pull on tissue in ways that register as breast pain.
A review of cardiac device procedures in female patients found that the most common reasons for involving plastic surgery alongside the cardiologist were surgery near breast implants and device displacement or discomfort. About half of the devices in that series were placed above the pectoral muscle and half below it, a decision that affects how much the device interacts with overlying breast tissue.10Journal of Cardiovascular Electrophysiology. Cardiac implantable electronic devices in female patients: Esthetic, breast implant, and anatomic considerations Subpectoral placement, where the device sits beneath the chest muscle, tends to make the generator less palpable and may reduce direct pressure on breast tissue, but it involves a more involved dissection and carries its own trade-offs in terms of surgical recovery.
Women who have breast implants face additional complexity. The implant and the pacemaker generator compete for the same real estate beneath the collarbone, and the surgical team has to plan pocket placement carefully to avoid damaging the implant capsule while still positioning the leads properly. Discomfort after these procedures sometimes stems from the interaction between the two devices rather than from either one alone.
The Role of Anxiety in Pain Perception
Not all pacemaker-related breast pain is purely physical. Research into pain during cardiac device implantation found that significant pre-procedure worry roughly doubled the odds of patients reporting severe pain, with an odds ratio of about 2.1.11PubMed Central. Pain during cardiac implantable electronic device implantation The study also noted that women and patients receiving defibrillators (which are bulkier than standard pacemakers) were groups where interventions to reduce anxiety might particularly help.
This does not mean the pain is imaginary. Anxiety amplifies pain signaling in well-understood ways, making real physical sensations feel more intense and harder to manage. For patients already dealing with chronic pocket discomfort, an anxious or hypervigilant nervous system can turn moderate soreness into something that feels debilitating. Addressing that psychological component with reassurance, counseling, or sometimes medication can meaningfully reduce the pain experience even when the physical cause remains unchanged.
Options When the Pain Persists
For chronic pacemaker-related pain that does not improve with time and standard pain management, several interventions exist. Pectoral nerve blocks can provide meaningful temporary relief. As described earlier, one patient got months of relief from a single nerve block procedure, though the pain eventually returned and required repeat treatment.3Anaesthesia & Surgery Open Access Journal. Chronic Pacemaker Pocket Pain Treated Successfully with A Pectoralis Nerve Block
When nerve blocks and conservative measures fail, lead extraction and pocket revision become options. A study of 28 patients who underwent lead extraction specifically for chronic device-related pain found that about two-thirds achieved complete freedom from pain afterward. Average pain severity before the procedure was seven out of ten. Of the 18 who became pain-free, 11 had new devices reimplanted without the pain recurring. Among the nine patients who still had pain after extraction, most saw at least some improvement in severity.12EP Europace. Lead extraction for reduction of chronic pain related to cardiovascular implantable electronic device Lead extraction is not a minor procedure, so it tends to be reserved for patients who have exhausted other options, but those numbers suggest it works for the majority.
Another approach is moving the device to a subpectoral position if it was originally placed above the muscle, or to the opposite side of the chest entirely. Pocket revision without lead extraction can sometimes resolve the issue when the pain is clearly coming from the pocket site rather than the leads themselves.
For patients who need a new pacemaker and are worried about pocket-related complications, leadless pacemakers represent a fundamentally different approach. These tiny devices are implanted directly inside the heart through a catheter, with no chest incision, no pocket, and no leads running through the veins. A comparative study found that the lead-related, pocket-related, and infectious complications seen with traditional pacemakers were entirely absent in the leadless group.13PubMed. Comparative study of acute and mid-term complications with leadless and transvenous cardiac pacemakers Leadless pacemakers are not suitable for every patient, particularly those who need multi-chamber pacing, but the technology is expanding and eliminates chest-wall pain as a concern.
Pacemakers and Mammography
Women with pacemakers sometimes wonder whether their device will interfere with routine breast cancer screening. The answer is yes, but the interference is manageable. A study examining mammography in patients with pacemakers found that compression force on the side with the device dropped by up to 23 percent compared to the opposite breast, while breast thickness increased by roughly 9.5 percent on the pacemaker side.14PubMed. Pacemaker in patients undergoing mammography: A limitation for breast cancer diagnosis? In other words, the technologist cannot squeeze the breast as firmly on the pacemaker side, which means slightly less tissue compression and potentially a less ideal image.
Mammography is still performed on women with pacemakers, and the device itself is not damaged by the procedure. But the reduced compression can make it harder to visualize tissue near the device, and the generator itself shows up as a bright white block on the image, obscuring whatever sits directly behind it. Technologists typically use modified positioning to capture as much tissue as possible, and supplemental imaging with ultrasound or MRI may be recommended for the area around the device. If you have a pacemaker and are due for a mammogram, let the imaging center know ahead of time so they can plan accordingly.
There is also the practical discomfort question. Having a mammography paddle press down on a breast that already has a pacemaker sitting just above it can be more painful than the compression alone would be. Women who find mammography on the device side particularly uncomfortable should mention it to the technologist, who can often adjust the angle or positioning to minimize direct pressure on the generator.
When to Seek Help Urgently
Mild soreness around a pacemaker site is expected for weeks after implantation and can flare with activity for months. But certain patterns warrant prompt evaluation:
- Sudden new pain: Especially if it occurs days to weeks after the procedure, this can signal lead perforation or a developing hematoma.
- Redness and warmth: Spreading redness over the device site, particularly with fever, suggests infection that needs urgent treatment.
- Tingling or numbness: New tingling in the breast on the pacemaker side, even without pain, may indicate lead displacement and should be evaluated with imaging.
- Visible skin changes: Thinning skin over the device, a new lump, or any sign that the device is pushing through the surface all require medical attention before the situation worsens.
- Pain with pacemaker malfunction: If your device starts pacing erratically, you feel skipped beats, or you become dizzy alongside chest or breast pain, the issue may be mechanical and time-sensitive.
Chronic low-grade discomfort that has been stable for months is a different story and is worth discussing at a routine follow-up. But any acute change from your baseline deserves a same-day call to your cardiologist’s office. Most of these complications are manageable when caught early and become far more complicated when left to progress.