4. Changes in mood
Yet another classic early warning sign of dementia is a distinct change in the mood. For instance, a person with early-onset dementia who is normally upbeat and happy may suddenly seem depressed or could have a sudden bout of extreme anger and rage that passes quickly.
On the other hand, it could also make someone who is usually reserved to become more outgoing and upbeat.
In either case, if you notice that you or someone you love is experiencing mood swings for no apparent reason, it’s a good idea to see a doctor determine the cause.