Obsessions: Obsessions are recurring thoughts, images, or urges that create anxiety or distress. They are typically unwanted and difficult to ignore.
Intrusive Thoughts: Intrusive thoughts are unwelcome, involuntary thoughts or mental images that may be disturbing or distressing.
Rumination: Rumination is the act of repeatedly thinking about the same negative thought or experience without making progress towards a solution. It often leads to increased feelings of sadness or anxiety.