More than half of the world’s population currently lives in cities, with one in three living in slums. By 2030, the world is projected to have 43 megacities with more than 10 million inhabitants, most of them in developing regions. While one in eight people currently live in 33 megacities worldwide, close to half of the world’s urban dwellers reside in secondary cities with fewer than 500,000 inhabitants. These secondary cities, particularly in Africa and Asia, are also expected to grow very fast. Reason enough for Be-cause Health, Belgium’s platform on international health, to take the urban turn, and put the spotlight on how to ensure the right to health in cities. In tandem with the Institute of Tropical Medicine, Sensoa organised two panels that took on the challenges of health service delivery in mega-cities and urban slums.