A sternum fracture, or break in the breastbone, is usually caused by direct trauma to the bone. The swelling of the joints associated with sternum fractures can cause popping in this area as well.

Is it normal for your sternum to pop?

A popping or cracking sound in the sternum is generally not a cause for concern. However, anyone who wonders about the cause may wish to see a doctor. This is especially important when any other symptoms, such as pain or swelling, accompany the sound. These may indicate an injury or another health issue in the area.

What does a crack sternum feel like?

Chest pain.

A broken sternum typically causes moderate to severe pain when the accident occurs. The pain may get worse when you take a deep breath, cough, or sneeze. The area over the sternum may be tender and hurt if touched.