Rumination is a way of responding to distress that involves repetitively and passively focusing on the symptoms of distress, and on its possible causes and consequences. Rumination is more common in people who are pessimistic, neurotic, and who have negative attributional styles. The tendency to ruminate is stable over time and serves as a significant risk factor for clinical depression. Not only are habitual ruminators more likely to become depressed, but experimental studies have demonstrated that people who are induced to ruminate experience greater depressed mood. There is also evidence that rumination is linked to general anxiety, post traumatic stress, binge drinking, eating disorders, and self-injurious behavior.

Rumination was originally believed to predict the duration of depressive symptoms. In other words, ruminating about problems was presumed to be a form of memory rehearsal which was believed to actually lengthen the experience of depression. The evidence now suggests that although rumination contributes to depression, it is not necessarily correlated with the duration of symptoms.

Rumination is similar to worry except rumination focuses on bad feelings and experiences from the past, whereas worry is concerned over potential bad events in the future. Both rumination and worry are associated with anxiety and other negative emotional states.

Measurement

The tendency to ruminate can be assessed with the Ruminative Responses Scale of the Response Styles Questionnaire. On this measure, people are asked to indicate how often they engage in 22 ruminative thoughts or behaviors when they feel sad or blue.