Medical history
Medication review
Memory and thinking tests
Physical examination
Blood tests
Hearing or vision evaluation
Brain imaging when appropriate
Doctors may also speak with a family member or caregiver because they may notice changes the person does not recognize.
Sudden Confusion Is Different
Dementia usually develops gradually.
Sudden confusion over hours or days is not typical of ordinary dementia progression and can be a sign of delirium or another medical emergency.
Possible causes include:
Infection
Stroke
Low blood sugar
Medication reactions
Dehydration
Electrolyte problems
Sudden confusion should be assessed promptly.
Can Dementia Be Prevented?
There is no guaranteed way to prevent all forms of dementia, but several habits can support brain health.
These include:
Managing blood pressure
Controlling diabetes
Avoiding smoking
Staying physically active
Maintaining social connections
Treating hearing loss
Sleeping adequately
Eating a balanced diet
Staying mentally active
Limiting excessive alcohol use
These habits also benefit cardiovascular and overall health.
The Bottom Line
The 10 early signs to watch for include:
Memory loss that disrupts daily life
Difficulty planning or solving problems
Trouble completing familiar tasks
Confusion about time or place
Problems with words or conversation
Misplacing things and being unable to retrace steps
Poor judgment
Withdrawal from activities
Mood or personality changes
Visual or spatial difficulties
One isolated symptom does not prove dementia.
What matters most is a pattern of progressive changes that interfere with everyday life.
If you or someone close to you is showing several of these signs, getting evaluated early can help identify the cause and determine the right next steps.
