,, | MeshID = D010259 | }} Paranoia's a thought process characterized by excessive anxiety or fear, often to the point of irrationality and delusion. Paranoid thinking typically includes persecutory beliefs concerning a perceived threat towards oneself. In the original Greek, παράνοια (paranoia) simply means madness (para = outside; nous = mind). Historically, this characterization was used to describe any delusional state. Sometimes in common usage, the… (More on Paranoia)