Obsessive-Compulsive Disorder (OCD): A mental disorder characterized by unwanted and repetitive thoughts (obsessions) that lead to compulsive behaviors as a way of reducing anxiety caused by the obsessions.
Intrusive Thoughts: Disturbing or distressing thoughts that occur involuntarily in individuals with various psychological conditions, including anxiety disorders.
Rumination: Persistent and repetitive thinking about negative experiences, emotions, or problems without finding solutions. It is often associated with depression and can lead to increased feelings of sadness or hopelessness.