The use of electromagnetic field in the treatment of diseases has already been known for centuries. Low hazard, wide applicability, good clinical effect and the relatively low cost enable the electromagnetic field therapy to be widely used. The biological effect of the electromagnetic field is based on inter alia, analgesic, anti-inflammatory, osteogenetic and regenerative actions, which are associated with the changes in cellular signal transmission, action on biological membranes, ion transport processes, protein synthesis, cell proliferation and apoptosis. In addition, the electromagnetic field increases quantity of collagen content elevating its density and a more regular arrangement. Furthermore, it induces the activation of glutathione peroxidase and intensification of the process of erythropoiesis leading to better use of oxygen in the tissues around the wound. The electromagnetic field is used in rehabilitation of patients with diseases of skeletal, nervous and respiratory systems. Moreover, electromagnetic field may be used in the course of most inflammatory diseases and in the case of concomitant pain. The objective of this paper is to present the actual state of knowledge on selected applications of electromagnetic field in the biomedical treatment area.