Rumination is the focused attention on the symptoms of one's mental distress. In 1998, Nolen-Hoeksema proposed the Response Styles Theory,[1][2] which is the most widely used conceptualization model of rumination. However, other theories have proposed different definitions for rumination. For example, in the Goal Progress Theory, rumination is conceptualized not as a reaction to a mood state, but as a "response to failure to progress satisfactorily towards a goal".[3] According to multiple studies, rumination is a mechanism that develops and sustains psychopathology conditions such as anxiety, depression, and other negative mental disorders.[4] There are some defined models of rumination, mostly interpreted by the measurement tools. [5] Multiple tools exist to measure ruminative thoughts. Treatments specifically addressing ruminative thought patterns are still in the early stages of development.[6]