Dementia symptoms vary depending on the cause. Common symptoms include: Cognitive changes Memory loss, which is usually noticed by someone else. Problems communicating or finding words. Trouble with visual and spatial abilities, such as getting lost while driving. Problems with reasoning or problem-solving. Trouble performing complex tasks. Trouble with planning and organizing. Poor coordination and control of movements. Confusion and disorientation. Psychological changes Personality changes. Depression. Anxiety. Agitation. Inappropriate behavior. Being suspicious, known as paranoia. Seeing things that aren't there, known as hallucinations.