A health expert will warn the routine screening of all elderly patients for dementia would be a "disaster".
Dr Chris Fox, from the University of East Anglia's medical school, said the stigma and anxiety caused by being diagnosed with early dementia, before symptoms are apparent, greatly outweigh any benefits.
He added that fear is bolstered by the fact that there is not a prospect of a breakthrough in treatment on the horizon.
Speaking at the TEDMEDLive healthcare conference in Bristol later today, he will say the risk of misdiagnosis is too high.
More top news
Cold and sunny for most, increasingly cloudy from the west. Cloud and wind spreading from the west of UK.
A woman, 63, was allegedly grabbed from behind and dragged to the ground in a serious assault near a nature reserve.
A 21-gun salute was first sounded in the capital, Havana, as Castro's ashes were taken to the cemetery in eastern Cuba.