The Mayo Clinic on Dementia: Good thing our stellar Medical Community would warn the American people if we were about to entrust someone with codes to Nuclear Armageddon. Symptoms Dementia symptoms vary depending on the cause, but common signs and symptoms include: Cognitive changes Memory loss, which is usually noticed by a spouse or someone else Difficulty communicating or finding words Difficulty with visual and spatial abilities, such as getting lost while driving Difficulty reasoning or problem-solving Difficulty handling complex tasks Difficulty with planning and organizing Difficulty with coordination and motor functions Confusion and disorientation Psychological changes Personality changes Depression Anxiety Inappropriate behavior Paranoia Agitation Hallucinations