Diseases in the ocean have many origins. Sewage from human-based outflows, dust and bacteria carried from land (desertification), and increasing water temperatures due to our warming climate, for example, have resulted in increased prevalence of waterborne disease outbreaks, some of which have caused mass mortalities. eDisease is working to capture broad trends of marine diseases across the globe — from fish to seals and corals — to work towards a better understanding of the movement and scale of various diseases, to promote new research questions, and support informed decisions.