hi Robert. my girlfriends father is suffering from upper back or upper chest pain , because of this he has been having a hard time sleeping, and breathing , also he has lost weight recently, and when they took him to the hospital the only thing that was found is that he has very low Hemoglobin , and the doctors cant find anything else, they are still doing tests and we are waiting to hear back, so i thought i might look this up also He is 50 years old, and usually very healthy, doesn t have a history with anemia , no cholesterol , no other diseases in the past. Do you have a clue what this might be?