One aspect of major depressive disorder is that thinking becomes globally pessimistic and negative about the self. This pervasive negativity and pessimism is often manifested in:

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Suicidal thoughts or preoccupations with death are a common manifestation of the pervasive negativity and pessimism seen in major depressive disorder. Obsessive thoughts and compulsive behaviors are more characteristic of obsessive-compulsive disorder, while manic episodes and flight of ideas are more characteristic of bipolar disorder. Catatonia and rapid cycling can occur in both bipolar disorder and depressive disorders, but are not specific to major depressive disorder.

One Aspect of Major Depressive Disorder Is That Thinking Becomes