Life is becoming more and more digital, and the smartphone has become our daily companion. This trend is also reflected in the health care system. The term mHealth includes not only portable heart rate monitors, but also smartphone apps that are declared as medical devices. Chronically ill patients are a popular and constantly growing target group for the mobile health market. How can patients and doctors benefit from such health treatments? What risks do they entail? We will get to the bottom of these and other questions in our Topic of the Month.