Stress can be positive or negative. It is defined as a state of psychological and physiological imbalance resulting from the disparity between situational demands and an individual's ability to meet those demands. Sources of work stress include career concerns, role ambiguity, rotating work shifts, role conflict, occupational demands, lack of participation in decision making, lack of group cohesiveness, and interpersonal/intergroup conflicts. Stress can negatively impact physical and mental health as well as behaviors if not properly managed.