Why Do I Have Pectus Carinatum?

Finding out you have pectus carinatum can bring up a lot of questions. The biggest one is usually: "Why did this happen to me?"

The simple answer is: we do not know the exact cause yet. Pectus carinatum happens when the chest wall grows in a way that pushes the breastbone, also called the sternum, outward. It is sometimes called "pigeon chest," but the medical name is pectus carinatum. Researchers believe it is usually linked to how the ribs, cartilage, and chest wall grow during childhood and the teenage years.

And here is the most important thing to know right away: you did not cause it. It is not from bad posture, sleeping the wrong way, exercising incorrectly, or doing anything wrong.

What Is Happening Inside the Chest?

Your ribs connect to your breastbone through flexible tissue called costal cartilage. This cartilage helps your chest move when you breathe and gives the front of the chest some shape and flexibility.

With pectus carinatum, doctors believe this cartilage may grow too much, grow unevenly, or grow out of sync with the ribs and breastbone. When that happens, the cartilage can push the sternum forward, creating the raised or "keel-like" shape in the chest. Some studies suggest that pectus carinatum may involve cartilage that grows longer than it should, along with differences in rib growth, so it is not always just one simple growth issue.

Why Does It Often Show Up During the Teenage Years?

Pectus carinatum can sometimes be seen when a child is very young, but for many people it becomes much more noticeable during a growth spurt — and that makes sense, since puberty is when the body is growing quickly. Bones, cartilage, muscles, and the chest wall are all changing at once. If the cartilage and ribs grow in an uneven way, the chest shape may become more obvious during this time.

So, a chest that looked only slightly different before may suddenly seem more noticeable in the early teen years. That can feel surprising, but it is very common for pectus carinatum to become more visible as the body grows.

Does Pectus Carinatum Run in Families?

You're not as alone in this as it might feel. Pectus carinatum shows up in roughly 1 out of every 1,500 children, and it's noticeably more common in boys than girls.

Sometimes, yes, it does run in families. There is a clear family connection for some people — Johns Hopkins Medicine notes that nearly 25% of pectus carinatum cases have a family history of chest wall issues.

That does not mean everyone with pectus carinatum inherited it in a simple, direct way. In many cases, it is probably multifactorial, meaning several genes and growth factors may work together. Some people have relatives with a similar chest shape, while others are the only person in the family with it.

Can It Be Linked to Other Conditions?

Most of the time, pectus carinatum is an isolated chest wall difference. That means it is the main issue and not part of a larger condition.

In some people, however, pectus carinatum can be associated with connective tissue or genetic conditions. These may include conditions such as Marfan syndrome, Noonan syndrome, Loeys-Dietz syndrome, and Morquio disease.

This does not mean you have one of these conditions just because you have pectus carinatum. It simply means that a doctor may look at the bigger picture, especially if there are other signs such as unusual flexibility, scoliosis, very tall and thin body shape, heart concerns, eye issues, or a strong family history.

The Good News: Pectus Carinatum Can Often Be Treated

One of the most encouraging things about pectus carinatum is that it can often be improved without surgery, especially when the chest wall is still flexible.

This is where bracing comes in.

What Is Pectus Carinatum Bracing?

A pectus carinatum brace is a custom-fitted chest brace that gently presses on the area of the chest that sticks out. Think of it a little like braces for teeth. Dental braces slowly guide teeth into a better position over time. A chest brace works in a similar way by applying steady, controlled pressure to help reshape the chest wall.

The brace usually has padded plates. One plate rests over the most prominent part of the chest, and another rests against the back. These are connected with adjustable bars or straps. The front plate applies pressure, while the back plate helps keep the brace stable.

How Does the Brace Work?

Bracing works best when the chest wall is still flexible. That is why it is often recommended during childhood or adolescence, before the cartilage becomes too stiff.

The brace does not usually change the chest overnight. It works gradually. The patient wears it for the number of hours recommended by their care team, and the pressure is adjusted over time. Regular check-ins help make sure the brace is working well and still feels comfortable.

Some children and teens may wear a brace for several months to a year or longer, depending on their age, chest flexibility, severity, and how consistently they wear it.

Advantages of Bracing

Bracing has some big benefits:

It works. Studies report that brace therapy is successful in up to 80% of pectus carinatum patients, especially when started while the chest is still flexible.

It is non-surgical. For many people with a flexible chest wall, bracing can improve the chest shape without an operation.

It is gradual. The brace works slowly and gently, guiding the chest into a better position over time.

It is adjustable. As the chest changes, the brace can be adjusted by the care team so the pressure stays effective and comfortable.

It can fit into daily life. Many patients can remove the brace for things like showering, sports, or certain activities, depending on the instructions from their provider.

It can help confidence. For some people, pectus carinatum affects how they feel in clothes, at the beach, during sports, or around friends. Improving the chest shape can help them feel more comfortable and confident in their own body.

Final Thought

Pectus carinatum can feel confusing at first, but it is a known and treatable chest wall condition. The exact cause is still not fully understood, but researchers believe it is usually connected to cartilage growth, rib development, genetics, and growth spurts.

The best part? There are options. For many children and teens, bracing is a simple, non-surgical way to guide the chest into a better shape while the body is still growing. With the right care team, the right brace, and consistent use, real improvement is possible.

If you've noticed these signs in yourself or your child, the next step is simple: talk to a doctor who specializes in chest wall conditions. Getting evaluated early, while the chest is still flexible, gives bracing the best chance to work.

For more information on Pectus Carinatum Bracing contact us through info@pectuslab.com.