Hello, every now and then I get a sharp pain right under the top part of my sternum. I ve noticed lately that it s most common when I m sitting and often right after I drink seltzer water or maybe eating something. It s happened other times, too, but this does seem to coincide. It never lasts more than a few seconds but because of it s position, it always creates considerable anxiety thereafter (so who knows which symptoms are actually real at that point).