What could this be? Sometimes when I'm sitting and tip over to lay down I hear a popping noise in my lower chest in between my boobs near the sternum and idk what it is I've kinda just been ignoring it but do you think it could have something to do with an enlarged thymus or swollen lymph nodes in that area? Because I'm having a leukemia/lymphoma scare right now because I just went to the doctor due to lymphoma m/leukemia symptoms and it turns out I had an elevated white blood count so there is a possibility I could have one of them but I didn't have a complete blood count so idk bout my red cells or anything but anyway could this popping mayb relate to lymphoma or leukemia because of swollen thymus or swollen lymph nodes? Or anything else? If not what could it be?