When i was young i was diagnosed with what is called pigeons chest. In the past couple of days Ive felt discomfort where my ribs overlap right in the center i think that s called the sternum, Ive recently been working out is this due to my recent muscle build up? the pain is felt when ever my abdominal or chest muscles contract, some times i feel a little snap?
Here I would like to add that in this condition you should performed exercises only on the prescription of your physiotherapist. Allow him/her to evaluate you first and then decide an excercise protocol balanced in stretching and strengthening exercises combined with exercised to improve your lung capacity as well. And do not overdo any exercise or perform one that increases any sort of pain.
If it dosent help then you can definately consult the general surgeon for the same.