There are different definitions of stress according to each discipline. In psychology, it is defined according to the individual's ability to adapt. The medical approach focuses on the reactions of the body to stress situations. And the organizational approach seeks to define in terms of sources of stress situations. According to a national interprofessional agreement on stress at work in 2008 is defined as a condition that occurs when there is an imbalance between the perception of a person with constraints imposed by its environment and the perception that it has its own resources to cope.