eHEALTH includes the application of ICT (information and communications technologies) across the whole range of functions that affect the health sector.
eHealth systems include tools for health authorities and professionals, from national to International, from the doctor to the hospital manager, nurses, data processing specialists, social security administrators and - of course - the patients, as well as personalized health systems for individuals and community.
Examples include health information networks, electronic health records, telemedicine services, personal wearable and portable communicable systems including those for medical implants, health portals, and many other ICT-based tools assisting disease prevention, diagnosis, treatment, health monitoring and lifestyle management (this description is based on text at the Europe's Information Society eHealth portal).
One of the major problems identified in healthcare services is the lack of ICT standards especially for interoperability related to the eHealth area. ETSI is addressing this issue.