[en] Radiofrequency electromagnetic waves have been a major health, environmental and societal concern for several years now, in France and abroad. Despite the measures taken to regulate and monitor the levels of exposure to electromagnetic fields, for several decades the scientific literature has regularly reported cases of people suffering from various disorders attributed to exposure to fields emitted by household appliances, electrical facilities and communicating devices. In this context, the Agency has published several opinions and collective expert appraisal reports, particularly in 2003, 2005, 2009, 2013 and, most recently, in 2016, on the potential health risks of exposure to radiofrequency waves. It also wished to pay due attention to the issue of electromagnetic hypersensitivity (EHS), by devoting a specific in-depth expert appraisal to this subject. This expert appraisal, whose results are published in this report, was based on an analysis of the scientific literature and on numerous hearings (with hospital and general practitioners, researchers, associations and the people concerned). It was also supplemented with data based on more than 500 additional comments from scientists and stakeholders, in the framework of the open public consultation that ran from 27 July to 15 October 2016, and which was based on a preliminary expert appraisal report. The Agency's expert appraisal showed the great complexity of the issue of electro-hypersensitivity. First of all, there are currently no validated diagnostic criteria for EHS, and the expert appraisal found that it is only possible to define EHS on the basis of self-reporting by individuals. The Agency also concluded that the pain and suffering (headaches, sleep, attention and memory disorders, social isolation, etc.) expressed by the people declaring themselves as electro-hypersensitive is a reality of life, requiring them to adapt their daily lives to cope with it. The 40 experts, who worked on this expert appraisal for almost four years, investigated many hypotheses in an attempt to understand these symptoms. However, current scientific knowledge shows no cause and effect relationship between the symptoms of people declaring themselves as electro-hypersensitive and their exposure to electromagnetic waves. Nevertheless, these symptoms, which can have a significant impact on the quality of life of these people, require and warrant suitable care by health and social service players. To this end, the Agency recommends asking the French National Authority for Health to consider the relevance of formulating recommendations for health professionals to ensure suitable care for people declaring themselves as electro-hypersensitive. The Agency also recommends developing training for health professionals on the issue of electro-hypersensitivity and training for social service professionals in supporting and counselling people declaring themselves as electro-hypersensitive, as well as taking their questions and expectations into account in their practices and fostering greater coordination between the players involved in their care. The Agency also recommends continuing research: - by strengthening the interactions between scientists and associations of people declaring themselves as electro-hypersensitive; - by supporting the establishment of research infrastructure suitable for investigating EHS, mainly in order to conduct long-term follow-up studies, while ensuring that the experimental conditions are controlled and take into account the circumstances of people declaring themselves as electro-hypersensitive; - by securing long-term funding for research work on the health effects of radio-frequencies.