What’s wrong with the bone in the middle of my chest that hurts when I expand it?

The pain in the middle bone of the chest when expanding the chest may be caused by normal physiological reasons, trauma or disease.
When expanding the chest, you should pay attention to the movement of the chest first, take deep breaths, and progress in a gradual manner.
If the pain in the middle chest bone after expanding the chest is recurring or worsens, it is important to pay attention to it and consult a doctor in time.