An assembly for the purpose of self-treatment by electromagnetic waves. The assembly includes a transmitting coil arranged to transmit electromagnetic waves, the transmitting coil comprising a case in which an electromagnetic coil is accommodated. The coil is connected to a cord which, at the end remote from the case, is fitted with a plug suitable for connection to an output of a personal computer, or the like, associated with a patient. The computer or other component of the assembly also is provided with an access code for accessing a treatment site on the internet or other computer network. The treatment site is arranged for transmitting to the patient's computer a data file which, upon being processed therein, generates via the transmitting coil, a treatment signal tailored to the respective patient.