Pectus Excavatum and Posture: The Hidden Connection

Pectus excavatum and posture are connected, but mostly in one direction: the sunken chest shapes how people stand, not the other way around. Posture work and strength training can change how noticeable the chest looks and how you carry yourself. They do not move the sternum or costal cartilage, whose position is skeletal.

Key points

• Posture and strength training change how a sunken chest looks and how upright a person stands. They do not move the sternum or costal cartilage, whose position is skeletal.
• The rounded-shoulder, forward-curled stance many people adopt is largely a learned way of standing that hides the chest, a documented part of the psychosocial picture of chest wall deformity in adolescents.
• The deformity is graded by the geometry of the chest, its width relative to its depth, not by how a person stands, so posture does not create the indentation and correcting posture does not remove it.
• The sternum's position responds to sustained mechanical force. Sternal elevation under a vacuum bell has been confirmed thoracoscopically during surgery (Haecker 2016).
• When the skeletal path is chosen, the response depends on age and consistency: younger cartilage is more pliable and reshapes more readily, and sustained daily use over months is the dominant factor in the result.
• Severity commonly changes during periods of rapid growth, independent of how a person sits or stands.

The short answer, expanded

Two things are true at once, and confusing them is where most of the myths start. The first is real: pectus excavatum shapes posture. A person with a visibly sunken chest often rounds the shoulders and curls the upper back forward, partly out of habit and partly to hide the indentation. That is a muscular pattern laid over a skeletal deformity, and it is a documented part of the psychosocial picture of chest wall deformity in adolescents.

The second point is the one people get backwards. Posture does not create the deformity, and correcting posture does not remove it. The sunken shape is a structural feature of the sternum and the costal cartilage, the flexible cartilage that joins the ribs to the breastbone. Standing straighter changes how the chest is presented and can make it look better. It does not change where the sternum sits.

So the honest version of the connection is this. Posture and the muscles around it govern how noticeable the chest is and how a person carries themselves. The bone and cartilage govern the depth of the indentation itself. Work on the first and you change appearance and comfort. Change the second and you have changed the deformity, and that takes sustained mechanical force, not a change in how you sit.

What the evidence actually shows

The two real connections

The link between pectus excavatum and posture runs through two mechanisms, and both are worth separating cleanly. The first is behavioural. The academic literature on chest wall deformity documents psychosocial impact in adolescents as a consistent finding, and one visible expression of that is a way of standing that hides the chest: shoulders drawn forward, upper back rounded, the head carried slightly ahead of the body. This posture is a response to the deformity, not its cause. It is a learned muscular habit, which is also why it can be unlearned with attention and training.

The second is muscular. Strength training increases the muscle mass that sits around and over the deformity and can reduce how noticeable it appears. It does not alter the position of the sternum or the costal cartilage. Both halves of that sentence matter. Building the pectoral, back and core muscles, and standing more upright, genuinely changes the silhouette a shirt drapes over. It does nothing to the depth of the indentation measured underneath.

What the sternum's position actually responds to

The depth of a pectus excavatum is a skeletal matter, and skeletal position responds to force, not to posture. The clearest demonstration is direct observation. During minimally invasive surgical repair, surgeons have watched the sternum and the attached rib cartilage lift under a vacuum bell through a thoracoscope (Haecker 2016). That is a mechanical event: negative pressure applied over the sunken area physically raises the bone while the device is on.

Turning that repeated lift into a change that persists is age-dependent and slow. Two things separate the people who respond from the people who do not. Younger cartilage is more pliable, so adolescents typically respond faster and more completely than adults. And consistency of daily use over months, rather than weeks, is the dominant factor in the result. A Swiss cohort at University Hospital Basel reported significant improvement in about 80% of 140 patients, and Scaife and colleagues (2025, n=240) reported a successful outcome in 66%. Reviewing 20 years of clinical application, Haecker and colleagues (2024) concluded the therapy is safe and a potential alternative to surgery in carefully selected patients, while stating plainly that no validated guidelines for it exist. A review of 13 studies placed the device's accepted indications in mild-to-moderate deformity and in patients who decline surgery (Loufopoulos et al. 2021). None of these tools is posture. They are mechanical or surgical.

What muscle and posture actually change

Posture and strength work operate on a different layer. They change how the chest is carried and how much muscle covers it, which is a real cosmetic and functional gain for many people, and they are low-risk. What they do not do is reach the skeleton. This distinction is easy to miss because the appearance can improve enough that people assume the underlying depth has changed. It has not. A separate confounder makes this harder to judge: severity commonly changes during periods of rapid growth, so a chest that looks better or worse over a year of adolescence may be responding to growth rather than to any posture routine. The only way to know whether the indentation itself has changed is to measure it the same way each time, not to judge it by how a person is standing on a given day.

Who this works best for

Posture and strength work suit a recognisable group.

• People whose main concern is appearance and stance. If the goal is to look and feel better in and out of a shirt, building muscle around the chest and back and correcting a rounded-shoulder habit acts directly on that.
• People whose habitual posture exaggerates the look. A forward-curled stance deepens the visual impression of the indentation. Straightening it does not move bone, but it removes the part of the appearance that posture was adding.
• Anyone at any age. Unlike the skeletal-correction path, back, chest and core strengthening carries little risk and no age window. It is reasonable to do while deciding on other options.
• People who understand what it is for. The gains are real when the expectation is set correctly: better presentation and posture, not a shallower chest.

Who this does not work for

This section matters more than the one above it, because posture work is where the most common false hope in this topic lives. It does not work for anyone expecting it to move the sternum or reduce the depth of the indentation. That depth is skeletal, and no amount of postural training reaches it. It does not resolve a deep, rigid deformity cosmetically on its own; muscle can soften the outline but cannot fill a structural hollow. It is not a treatment for anyone who has been told, incorrectly, that pectus excavatum is caused by slouching. The deformity is a structural feature of the chest wall, not a product of bad posture, and posture routines will not remove it. And it is not a substitute for medical assessment. Anyone with breathlessness disproportionate to exertion, palpitations, chest pain or reduced exercise tolerance should be assessed by a physician before starting any programme, because those symptoms change the calculation and are not something an exercise routine should precede.

What this means in practice

Three things follow from the evidence above.

Separate the two goals before you choose a tool. If the goal is to stand and look better, posture and strength work are low-risk, low-cost and worth doing on their own terms. If the goal is to change the depth of the indentation, that is a skeletal question, and the tools that address it are the vacuum bell in selected patients or surgery, not posture. Pursuing one while expecting the other is how people conclude that nothing works.

Do not let posture work delay a proper assessment. The skeletal-correction path is age-dependent. Cartilage stiffens steadily as a child grows, so the window in which the chest responds most readily narrows while a person waits. Posture training is a reasonable thing to do at any age, but in a young child it should sit alongside a timely assessment, not replace it.

Keep the cost asymmetry in view. Surgical repair in the United States commonly runs 40,000 to 70,000 dollars and involves a bar in the chest for two to three years plus a second operation to remove it. Posture and strength work cost little and carry little downside. That asymmetry does not make one the answer for every person, but it means the low-risk work is worth doing while the larger decision is made carefully. If you want to know whether your own chest is a candidate for the skeletal path, measuring the indentation properly at home is the first honest step, and what exercise can and cannot do is covered separately.

Not sure whether this applies to you?

The two questions this article cannot answer for you are whether your own chest is a reasonable candidate, and which device size fits it. Both depend on measurements only you can take.

The FormaChest assessment takes about four minutes. It screens your situation against the variables the research identifies as predictive (age, depth of the indentation, chest flexibility and symptoms) and returns an honest read on whether conservative treatment is a reasonable first step. That includes telling you when the answer is to see a surgeon first, which it does for roughly the situations described in the section above.

It also returns a vacuum bell size recommendation based on your own measurements, at no cost.

Sizing is normally not free or simple in this category. The usual process is to email photographs of your bare chest to a company and wait for a reply, or to print paper templates and tape them to yourself, with the manufacturer warning that self-measurement may produce the wrong model. The assessment asks for numbers you can take alone with a ruler. No photographs, no email exchange, no deposit.

Take the free assessment →

What the research does not tell us

Presenting the posture connection as settled would misrepresent it, and the gaps are specific. There is no quantified figure in this evidence for how much posture or strength work changes the appearance of a sunken chest; the honest claim is directional, that muscle and posture change how noticeable the chest is, not a percentage. No controlled posture-intervention trial is cited here, so the strength of the cosmetic effect is a matter of clinical observation rather than measured outcome. The direction of causation is not fully established either. The concealment posture is best understood as a response to the deformity, but the cited evidence does not cleanly separate cause from effect. Severity commonly changes during periods of rapid growth, which confounds any before-and-after impression attributed to a posture routine. And on the skeletal side, Haecker and colleagues (2024) note that no validated guidelines for conservative correction exist after 20 years of use, and long-term durability data remain weak. Anyone quoting a precise posture-improvement number is going beyond what this literature supports.

About this guide This article is published by FormaChest, a European manufacturer of vacuum bell correction systems, registered in Romania as AUGUMENTUM SRL. We make the device described above, and every figure quoted is cited to its source so you can verify it independently. The distinction this article draws, between changing how a chest looks and changing where the sternum sits, is the reason FormaChest ships the bell, brace and gel together rather than a device or a posture routine alone: the vacuum bell, a chest support brace, post-session skin care, the written protocol, and scheduled follow-up. Bought as a set, the bell, brace and gel come to $461.40 in the men's line and $491.40 in the women's line, while every competitor in this category sells the device on its own. See what is included →Tomas Titus is the founder of FormaChest (AUGUMENTUM SRL, Craiova, Romania). He had pectus excavatum and corrected it without surgery, documenting his own vacuum bell treatment on camera, taking each measurement before a session rather than after. His chest depth went from 25mm to 4mm. That is one person's result at 19; published adult timelines run 12 to 24 months and results vary. He is not a clinician, and nothing in this article is a substitute for assessment by one.

Related questions

• What is pectus excavatum?
• Can exercise fix pectus excavatum?
• What are the symptoms beyond the physical?
• Does the vacuum bell actually work?

References

1. Scaife ER, et al. Vacuum bell therapy for pectus excavatum. 2025. n=240
2. Haecker FM. Vacuum bell therapy. Annals of Cardiothoracic Surgery. 2016. PMID 27747177
3. Haecker FM, et al. 20 years clinical application of the vacuum bell for conservative treatment of pectus excavatum. Journal of Thoracic Disease. 2024. PMID 39268139
4. Loufopoulos I, Karagiannidis IG, Lampridis S, Mitsos S, Panagiotopoulos N. Vacuum Bell: Is It a Useful Innovative Device for Pectus Excavatum Correction? Turkish Thoracic Journal. 2021. PMID 35110237

This article is for information only and is not medical advice. Pectus excavatum should be diagnosed and assessed by a qualified physician. If you have chest pain, breathlessness, palpitations or reduced exercise tolerance, seek medical assessment before beginning any treatment.

Last reviewed: July 2026.