You probably know cardiovascular disease and cancer are the leading causes of death, but a risk you may not be familiar with is going to the hospital. A new study from Johns Hopkins University School of Medicine reviewed Medicare data and statistics from 13 hospitals to gain insight into the frequency at which medical errors contribute to death. In the study, the authors focused on preventable lethal events and their findings may give you a heart attack—medical error is the 3rd most common cause of death in the United States. The goals of the study are to increase funding for research into patient safety and to draw attention to the need for system improvements, not to scare the living daylights out of you. Too late.