A cognitive process involved in the experience of anxiety that serves to maintain high levels of vigilance for personal danger. Compared with anxiety, worry is more closely associated with problem-solving (confidence, approach rather than avoidance of a problem and personal control of the problem). Worry is also less associated with negative affect (e.g. depression, confusion) compared with anxiety.
Mathews, A. (1990). Why worry? The cognitive function of anxiety. Behaviour Research and Therapy, 28(6), 455-468. doi: 10.1016/0005-7967(90)90132-3
Zebb, B. J., & Beck, J. G. (1998). Worry Versus Anxiety Is There Really a Difference?. Behavior Modification, 22(1), 45-61. doi: 10.1177/01454455980221003