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.
More top news
Northampton General Hospital is one of the most advanced centres for radiotherapy after unveiling machines that target cells more accurately
Clear and cold with the breeze easing allowing a fairly widespread frost to form.
Doctors had advised switching off the life support machine of little Ava last year but her parents refused.