A visible dent or hollow in the center of your chest is almost always a condition called pectus excavatum, the most common congenital chest wall deformity. It affects roughly one in every 400 births and ranges from a barely noticeable shallow dish to a deep funnel-shaped depression of the breastbone. Many people live with a mild version for years before wondering whether it means anything, while others notice it worsening during adolescence and start asking questions about health consequences and treatment.
What Pectus Excavatum Looks Like and When It Appears
Pectus excavatum gets its name from the Latin for “hollowed chest.” The sternum (breastbone) and several of the cartilage segments connecting the ribs to the sternum curve inward, creating an indentation that can be shallow and broad or narrow and deep. The condition is present from birth in many cases, but it can be so subtle in infancy that nobody notices until the child is a few years old. In some people it stays mild and stable; in others, the dent deepens gradually through childhood and then accelerates during the teenage growth spurt.
That pubertal worsening is one of the most consistent patterns clinicians see. Once the deformity is noticed, it tends to progress slowly until puberty, when rapid progression is often observed.1PubMed Central. Pectus excavatum from a pediatric surgeon’s perspective This means a child who seemed to have only a minor dip in the chest at age eight may have a significantly deeper indentation by sixteen. The deformity is also more common in males than females, by a ratio of roughly three or four to one.
What Causes It
The honest answer is that nobody has pinned down one clear cause. For decades, the leading theory was that the cartilage connecting ribs to the sternum grows too fast, essentially pushing the breastbone inward. But that theory has been challenged. A study comparing rib and cartilage lengths on the more-depressed side of asymmetric patients found that the cartilage on the deeper side was actually shorter or the same length as the other side, which contradicts the overgrowth explanation.2PubMed. Does overgrowth of costal cartilage cause pectus excavatum? A study on the lengths of ribs and costal cartilages in asymmetric patients So the mechanism behind pectus excavatum remains an open question, and researchers continue to look for alternative explanations involving connective tissue development and structural biomechanics during growth.
What is clearer is that genetics plays a role. Families cluster for pectus excavatum at higher rates than you would expect from chance. A study tracing inheritance across 34 families found a mixture of inheritance patterns: some families followed a dominant pattern, others a recessive one, and still others showed X-linked or complex inheritance, suggesting multiple genes are involved rather than a single “pectus gene.”3PubMed. Family study of the inheritance of pectus excavatum If a parent, sibling, or close relative has a chest wall deformity, the odds of having one yourself are higher, though it is far from guaranteed.
Connective Tissue Disorders and Pectus Excavatum
Pectus excavatum sometimes shows up alongside connective tissue conditions like Marfan syndrome and Ehlers-Danlos syndrome. In Marfan syndrome, weakness in connective tissue throughout the body contributes to the structural abnormalities in the chest wall, and pectus excavatum is considered one of the hallmark skeletal features of the condition.4PubMed Central. Pectus updates and special considerations in Marfan syndrome That association matters because connective tissue disorders can also affect the heart and blood vessels, which means a person with pectus excavatum plus signs of a connective tissue problem, like unusually flexible joints, a tall and thin body type, or a family history of aortic problems, should be evaluated more thoroughly.
A recent review noted that while familial clustering supports a genetic contribution to pectus deformities in general, no single causative gene has been established, and syndromic associations, especially connective tissue disorders, remain the most clinically actionable part of the diagnostic workup because they warrant cardiovascular surveillance.5PubMed Central. Congenital Chest Wall Deformities in Children: A Narrative Review In other words, the dent itself is usually benign, but what it might signal about the rest of your body is worth investigating.
Can It Actually Affect Your Heart and Lungs?
People with mild pectus excavatum often have no physical symptoms at all. But when the indentation is moderate to severe, the depressed breastbone can physically compress the structures behind it. The heart sits just behind the sternum, and in deeper cases the right side of the heart gets squeezed against the spine. This compression can lead to shortness of breath and chest pain during exertion.6PubMed Central. Right ventricular compression observed in echocardiography from pectus excavatum deformity In rare and severe cases, the right ventricle can develop dysfunction from being chronically compressed.7PubMed Central. A case of right ventricular dysfunction caused by pectus excavatum
Lung function can also take a hit. Exercise testing in patients with pectus excavatum has shown reduced peak oxygen consumption and stroke volume during upright exercise compared to controls. Interestingly, when the same patients exercised while lying down, their performance came much closer to normal levels, suggesting that the upright position makes the heart-filling problem worse because gravity compounds the mechanical compression.8PubMed. Why is exercise capacity reduced in subjects with pectus excavatum? This is why some people with pectus excavatum feel fine at rest but notice they cannot keep up during cardio. It is not “just being out of shape,” and it is not anxiety, though both get blamed frequently. A multicenter study found that after surgical correction of severe pectus excavatum, forced vital capacity improved from about 88% to 93% of predicted, and peak oxygen consumption rose by about 10%.9Journal of the American College of Surgeons. Multicenter Study of Pectus Excavatum, Final Report: Complications, Static/Exercise Pulmonary Function, and Anatomic Outcomes
Clinicians now recommend cardiopulmonary exercise testing before any surgical correction to estimate the degree of functional impairment and determine whether further cardiac workup is needed.10The Annals of Thoracic Surgery. Cardiopulmonary Exercise Capacity and Magnetic Resonance Imaging in Pectus Excavatum
Other Conditions That Can Look Like a Chest Dent
Not every indentation in the chest is pectus excavatum. A few other possibilities are worth knowing about, especially if your dent is off-center, appeared after trauma, or is accompanied by other unusual features.
Poland syndrome is a rare congenital condition where part or all of the pectoralis major muscle on one side of the chest is missing, sometimes accompanied by rib abnormalities and hand anomalies on the same side.11PubMed Central. Poland syndrome The missing chest muscle can create a visible hollow that mimics a dent, but it is typically one-sided and involves soft tissue rather than a depressed sternum.12The Annals of Thoracic Surgery. Clinical Analysis of 113 Patients With Poland Syndrome
The sternum itself can also have natural anatomical variations. Imaging studies have documented a range of sternal variants including small holes (foramina), clefts, fusions between segments, and bony ridges, any of which can feel like an unusual dent or bump to someone poking around their chest.13PubMed. Frequency of sternal variations and anomalies evaluated by MDCT These are typically harmless and discovered incidentally on imaging done for unrelated reasons.
If a chest indentation appeared after a car accident, a fall, or a sports injury, a depressed rib fracture is a different possibility entirely. Traumatic chest wall deformities tend to be painful, localized, and associated with a clear injury event, which distinguishes them from the painless, gradually noticed dent of pectus excavatum.
How Doctors Measure Severity
If you have a chest dent and are wondering whether it is medically significant, the standard tool is the Haller index, a ratio calculated from a CT scan. It divides the widest internal width of the chest by the shortest distance between the sternum and the spine. A normal chest has a Haller index around 2.5. A value above 3.2 is generally considered severe and is one of the thresholds used to determine whether surgical repair is warranted.14Pediatric Radiology. Comparison of Haller index values calculated with chest radiographs versus CT for pectus excavatum evaluation
One persistent problem is that radiology reports sometimes note pectus excavatum on a scan without including an actual Haller index number, leaving patients and referring doctors without a clear sense of how severe the deformity really is. Clinicians have argued that whenever pectus excavatum is identified on imaging, an objective severity measurement should always be included in the report.15PubMed Central. Pectus excavatum severity underestimated due to lack of objective measures in radiological reports If your imaging report just says “pectus excavatum noted” with no number, it is reasonable to ask your doctor about getting the Haller index calculated.
The Emotional Weight of a Visible Deformity
Many people with pectus excavatum describe the cosmetic and psychological effects as more distressing than any physical symptoms. Research across multiple groups of adolescents and young adults with chest wall deformities has consistently found impaired body image, social avoidance, and reduced quality of life, even in people who do not meet criteria for a formal psychiatric diagnosis.16PubMed Central. Psychological Impact of Congenital Chest Wall Deformities Among Adolescents and Young Adults Avoiding swimming pools, changing shirts in locker rooms, and wearing baggy clothing to hide the chest are common experiences.
This psychological burden is taken seriously in treatment decisions. In fact, the decision to treat pectus excavatum is often guided as much by the patient’s perception of cosmetic discomfort as by physiological markers like the Haller index or exercise test results. Both factors matter, and a patient bothered significantly by their appearance has a legitimate reason to explore correction even if their cardiac and lung function tests come back normal.
Non-Surgical Treatment With a Vacuum Bell
The vacuum bell is a suction device placed over the chest that lifts the sternum outward when a small pump creates negative pressure under the cup. It sounds almost too simple to work, but it has accumulated a growing evidence base over the past fifteen years, especially for younger patients with flexible chest walls.
A retrospective study of 72 patients found that about a quarter achieved excellent correction and another 18% achieved good correction as measured by the Haller index. Patients who started before age eleven and continued for at least two years had significantly better outcomes.17PubMed Central. Vacuum bell therapy for pectus excavatum: a retrospective study A larger study following 259 patients over fifteen years found a 52% success rate among those who completed treatment, with more daily use, longer overall treatment duration, and overnight use all associated with better results. Complications were minor and occurred in about 23% of patients, mostly skin irritation. Recurrence after successful treatment was low, at about 2%. Among patients originally on a waiting list for surgery, roughly a quarter no longer needed the operation after vacuum bell therapy.18PubMed. 15 Years of Vacuum Bell Therapy for Pectus Excavatum: Long-term Outcomes and Influencing Factors
The catch is commitment. Treatment typically requires wearing the device for an hour or more daily over months to years. For adults with a rigid chest wall, results tend to be much less impressive than for children and young teenagers whose cartilage is still flexible. Physical therapy programs targeting posture, spinal mobility, and respiratory function are sometimes used alongside vacuum bell therapy or as a standalone approach for milder cases, though the evidence base for exercise-only treatment is still being established.
Surgical Correction
When pectus excavatum is severe, symptomatic, or causing significant psychological distress, surgery is the definitive treatment. Two main procedures exist.
The Nuss procedure is now the preferred operation for most patients. It is minimally invasive: a curved metal bar is inserted behind the sternum through small incisions on the sides of the chest and positioned to push the breastbone outward into a normal shape.19PubMed Central. Short Nuss bar procedure The bar stays in place for two to three years while the chest remodels around it, then is removed in a shorter follow-up surgery. A nationwide analysis of over 10,000 pectus repairs found that 86% were Nuss procedures, reflecting how dominant this approach has become.20PubMed. Outcomes After Pectus Excavatum Repair: A Nationwide Comparison of Nuss Versus Ravitch Operations
The Ravitch procedure is the older, open approach. It involves removing the deformed cartilage segments and repositioning the sternum, sometimes with a support strut. It is more invasive and generally involves a longer hospital stay and higher rates of complications like bleeding and the need for chest tubes.20PubMed. Outcomes After Pectus Excavatum Repair: A Nationwide Comparison of Nuss Versus Ravitch Operations A Society of Thoracic Surgeons database analysis confirmed that open repair patients were more likely to need more than six days of hospitalization, require blood transfusion, and be readmitted, though after statistical adjustment the overall complication rates were similar between the two approaches.21PubMed. Complications after Ravitch versus Nuss repair of pectus excavatum: A Society of Thoracic Surgeons (STS) General Thoracic Surgery Database analysis
A systematic review comparing the two procedures in children found no significant differences in overall complications, reoperation rates, wound infections, or pneumothorax between the Nuss and Ravitch approaches. In adults, though, the Nuss procedure was associated with a higher incidence of overall complications, suggesting the Ravitch approach may be preferable for older patients with a more rigid chest.22PubMed Central. Ravitch versus Nuss procedure for pectus excavatum: systematic review and meta-analysis Age and chest wall flexibility matter in choosing between the two, and some surgeons use a modified Nuss approach when pectus repair needs to happen alongside open heart surgery.23PubMed. Modified Nuss procedure versus Ravitch in concurrent repair of pectus deformity and open-heart surgery
What Life Looks Like After Surgery
Recovery from a Nuss procedure is not trivial. The first few weeks are painful, and patients typically need strong pain management. With the bar still in place, physical activity is restricted, and quality-of-life scores on physical measures tend to be lower than in patients who have already had their bars removed.24PubMed Central. Health-related quality of life after Nuss procedure for pectus excavatum: a cross-sectional study That finding makes intuitive sense: having a steel bar behind your breastbone limits what your torso can do comfortably.
The good news is that after bar removal, patients report high satisfaction, an improved sense of social belonging, and better well-being compared to before surgery.25PubMed. The quality of life after bar removal in patients after the nuss procedure for pectus excavatum Both patients and their parents report these gains. Quality-of-life improvements tend to hold steady after bar removal rather than continuing to climb, suggesting the biggest psychological and functional gains happen with the initial correction and are preserved once the hardware comes out.
When to Seek Evaluation
Pectus excavatum is usually well tolerated in younger children. Symptoms like pain in the affected cartilage areas, exercise intolerance, and shortness of breath tend to develop later, as the deformity worsens with rapid vertical growth during adolescence. For children with a noticeable dent, periodic monitoring through the growth years is reasonable. The decision to pursue active treatment is guided by a combination of the patient’s cosmetic concerns, the severity index on imaging, and any markers of physiological compromise such as reduced exercise capacity or cardiac compression on echocardiography.
If you are an adult who has lived with a chest dent for years and never had symptoms, the condition is unlikely to become dangerous on its own. But if you notice worsening exercise tolerance, new shortness of breath, or chest pain with exertion, those are reasons to bring it up with a doctor and get a proper workup including the Haller index and possibly a cardiopulmonary exercise test. The dent you have been ignoring might be doing more than you think.