Dementia or Delirium?

Delirium -- similar to dementia, but worse, and starts in a day or so instead of worsening over the course of weeks, months, or years.  May include hallucinations, agitation, severe confusion, dizziness and falling.

So come to find out, urinary tract infections are often misdiagnosed in the elderly.  Often the typical UTI symptoms are non-existent in the elderly or those with Parkinsons.  It's important for family and care-givers to recognize that "sudden-onset dementia" may be a sign of UTI.  Of course, it may be something else, and it's always important to figure out.  But UTI is one of those things that doesn't quickly come to mind as an explanation for Grandpa's sudden and severe confusion.