Organizational changes can be defined as a process that changes and adapts existing organizations. In order to successfully implement organizational changes within the organization, it is necessary to define what needs to be changed, examine which changes employees are willing to accept and how much changes they can endure. It is important to implement changes gradually and to instruct all employees on possible changes given that employees are the carriers of the organization. There are three basic organizational changes. These are personnel changes, changes in the organizational structure and technological changes. The most important changes are the personnel ones because during these changes employee resistance to change occurs. In order to implement the changes effectively it is necessary to motivate employees for changes, to convince them that they are necessary and that they provide benefits. Each and every organizational change causes some kind of stress among employees. Stress is a state of tension which is reflected in the coping of individuals with unusual requirements, constraints and opportunities. Sometimes it can be positive, but in most cases it raises certain consequences among employees which can be physical, psychological and behavioural ones.