 In a wide sense, nosology deals not only with diseases, but with any kind of medical condition, like injuries, lesions or disorders.Medical conditions, like diseases, can be defined by cause, pathogenesis (mechanism by which the disease is caused), or by a collection of symptoms, medical signs and biomarkers, particularly when the other two definitions are not available (idiopathic diseases).From a nosological point of view, medical conditions could be divided in disorders, diseases, syndromes, lesions and injuries, each one with some specific meaning