eHealth is currently a hot topic, but is certainly not a new one. The use of communications technology to relay health-related information or provide medical services has been around since the advent of this technology. It has been primarily over the last decade that eHealth has seen a global expansion, due to the far-reaching capabilities of the Internet and the widespread use of wireless technology. This paper will outline what eHealth is, what adherence is, and how eHealth can help with adherence, in cancer and supportive care particularly. It will discuss the current state of the art, and project into the future. Keywords: telemedicine; compliance; use of electronic media for health