Hello and welcome to Healthcare Magic. Thanks for your query. You have mentioned that you are bulimic and that you purged lat night. However, you have not mentioned whether you have the habit of inducing vomiting in order lose weight. The reason is that if you are in the habit of doing so, then that can be the probable cause for the blood that you threw up. Ver often, persons with bulima who induce vomiting have esophagial erosions and tears due to repeated vomiting and this causes bleeding. However, if you don t have the habit of induced vomiting, and had repeated cough recently, then this could be the possible cause. If you have any further episodes of bringing out blood then you need to report this to your doctor urgently. I would also suggest that you seek professional help for your bulimia, because if untreated, it can cause various medical complications. So, please don t hesitate to seek help. Regards, Dr. Jonas Sundarakumar Consultant Psychiatrist