As the Syrian conflict enters its fifth year, the long-established principle that neither militaries nor armed groups can target medical workers and the health care system for attacks has eroded. By March 2015, at least 610 medical personnel have been killed, and there have been 233 deliberate or indiscriminate attacks on 183 medical facilities. Physicians for Human Rights has documented these killings and attacks through its interactive online map, which is updated monthly. This report provides a brief account of the violence committed against health workers in the Syrian conflict over the past four years.