Digital tools including mobile apps, wearable sensors, and social network platforms offer unprecedented opportunities in health research and healthcare. However, this rapidly emerging sector is outpacing existing regulatory structures and challenging norms for ethical practice. Camille Nebeker, EdD, MS, Associate Professor of Behavioral Medicine in the Department of Family Medicine & Public Health at the UC San Diego School of Medicine describes how technologies, including wearable sensors and artificial intelligence, are leveraged to capture personal health data and infer health status. Nebeker presents the ethical considerations specific to informed consent, risks of harm and potential benefits while underscoring the role that funding agencies, policy makers, researchers, ethicists, and editors have in creating the infrastructure needed to advance safe digital health research and practice.