Electromagnetic hypersensitivity
Most experiments show that people who claim to have EHS can't correctly tell if they are near EM radiation or not, and the medical and scientific communities don't think its a real illness. Several double-blind experiments suggest that people who say they have EHS can't detect if electromagnetic fields are present, and are just as likely to report feeling sick after a phony exposure as they are after real exposure, making scientists think it is the nocebo effect.