An essential component of anxiety disorder is rumination .  That is the constant and intense brooding about problems or perceived problems.  It is the extreme version of simple worry and there is a name for it - pure obsessional  OCD or "Pure O." Now, there are several levels of worry.  And I want to make clear that this is a very intense type of worry and anxiety tied to disturbing thoughts.  In other words, if you ruminate about household chores this is not the same as having Pure O. Pure Obsession is unlike simple worry in that it