It's thought as many as 50,000 people may be living with dementia in the East - but haven't been diagnosed.
The statistics obtained by the Alzheimer's Society found doctors in some areas are spotting only a third of cases.
It means patients are missing out on the vital support they need.
Figures released today have revealed thirty thousand people in East Anglia are living with dementia - an increase of two thousand on last year.
It's thought as many as fifty thousand people may have the condition - but haven't been diagnosed. People who are worried about their memory should conact the Alzheimer's Society.