By David Tolin, Ph.D., ABPP Intrusive thoughts are a common human experience, yet they take distinct forms that differ in structure, function, and clinical significance. Three of the most frequently discussed types are obsessions, worry, and rumination. Although they share features—repetitiveness, perceived uncontrollability, and cognitive intrusiveness—their underlying processes and diagnostic implications diverge in meaningful ways. Obsessions, as defined in obsessive‑co

Worries conjured by our minds don’t obey the rules of reality any more than dreams, or nightmares.