Chew or swallow. Talk or think of words. They may even wander away and get lost. Dementia happens when brain cells no longer work or are damaged. The most common cause of dementia is Alzheimer's disease.
Strokes can also cause a person to have dementia.
Talk to your doctor about any symptoms you notice. Ask questions to check memory and thinking. Check for depression. There is no cure for dementia. But some people can be treated with medicine.