Today while standing next to my husband, I placed one of my hands on my husband's chest, leaned in and kissed him while he was sitting in a chair. As I pushed off of him he immediately yelled out in painbecause his chest started to hurt him. After the pain went away we discovered a lump located just below his sternum. He is not having any difficulty breathing and he is not in any pain (just initially it hurt). However, he was unable to keep his dinner down tonight, we think it might be just from his nerves, not knowing what is causing the lump. Could he have just a protruding sternum that we did notice before or could it be a more serious situation?