The concept of disability, which is not unitary in our legal system, is in constant evolution, and proof of this is the recent jurisprudence of the TJUE, which in the field of occupation and employment, has meant the configuration of a flexible concept of disability, which allows for the extension of the legal protection of Council Directive 2000/78/EC, of 27 November 2000, relating to the establishment of a general framework for equal treatment in employment and occupation, to those workers who suffer from ailments which, despite not being administratively classified as a disability, are worthy of this special protection. This doctrine is a novelty since, even though it is limited to labour relations, it abandons the traditional conception of disability as a permanent and irreversible situation.