The value of mHealth for sustainable healthcare is discussed. It is projected that mHealth can become a disruptive technology that is set out to radically transform the current state of medical disciplines. In particular, the mHealth solutions can provide better understanding of the organism stability margins and of the emergence of diseases as well as ensure more patient safety under drug and physiotherapy prescription. The issue of measuring the physiological quantities is addressed, with the conventional yet complex task of quantitative accuracy evaluation being discussed. The concept of complexity and its relevance for the physiological parameters defining both the health state and disorders is accounted for. The principles of body area networking and the relevant standards are briefly overviewed, with a focus on security issues. The concept of biofeedback implemented through mHealth sensor technologies is examined. Basic requirements to facilitate market acceptance and response are analyzed. Selected case studies of pervasive health monitoring are presented. Possible current and future mHealth applications are considered. Since some general problems of healthcare are touched upon in the article, it is intended to provoke a controversy.