People who work in the health field are responsible for the wellbeing of patients in a medical or preventive context. Skills and techniques used within health are research, health administration, care taking, medication and treatment.
In a leadership position someone is responsible for a group of people, typically an organizational unit or the entire organization, depending on the size of the organization. Leaders are responsible and accountable for overseeing and guiding strategic activities, programs and managers who report to them. Just a few people in an organization are typically in a leadership role.