You probably mean the xiphoid process? Or in correct latin: processus xiphoideus.
The hard bone plate in the middle of your chest is called the sternum. It is attached to ribs coming from your backbone, and to the clavicle bone (the long thin bone from your sternum to your shoulder).
The sternum is divided into three parts: Caput, corpus and processus xiphoideus.
The latter is the lowest part of the sternum, and consist of a small but pointy bony formation. You find it where the lower ribs from each site meet. If it protrudes from your chest, it is perhaps just a perfectly "normal" anatomic anomaly. No person is completely normal, when it comes to anatomy. By far most people have some sort of anatomic oddity to them.
Se Google for pictures of the sternum.
A xiphisternum is a small cartilaginous extension to the lower part of the sternum, which in adult humans is often ossified.
A xiphoid is the cartilaginous extension of the lower sternum - otherwise known as the xiphisternum.
Only the xiphisternum, I think; but whether it's bone or cartlidge is debatable.
You could either be having a heartattack or your nervous or anxious about something.
When you see your doctor TODAY he or she will help you find out.
The posterior segment, or extremity, of the sternum; -- sometimes called metasternum, ensiform cartilage, ensiform process, or xiphoid process., The xiphiplastron.
you need to click on the treasure chest and then it will move.
You could have a food allergy related to nuts, or anything contained in that brand of peanut butter. I would talk to your doctor and see if you can get a referral to an allergist, or if he has other ideas about why it could be happening.
Frontal, Parietal,Occipital, Temporal bone, Spenoid, Xiphisternum, Sternum, pelvic bones are some of the examples of flat bones.
Some people can have a sensitivity to alcohol. So it could manifest as congestion. But I have never heard of that happening to anyone I know before.
They are growing attached to you. If your cat is sleeping on you, it either loves you, is scared of it's current bed, or is getting older than it should be.
Sounds like it could be heart related. If this is happening to you, get to a hospital.