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
A Cambridge teen faces a three year driving ban after being caught drug-driving twice since passing his driving test in August.
Norfolk Constabulary has been responding to dozens of Twitter users angry at a viral video showing an arrest in Norfolk, Virgina.
Staff at Banham Zoo in Norfolk have just welcomed the arrival of a very precious new red panda cub.