New figures from the Alzheimer's Society show that, in some parts of the East Midlands, just four in ten people with dementia are being diagnosed with the condition.
The charity says it's disappointing that the number of cases being spotted varies so greatly between different parts of the region.
Our correspondent Peter Bearne has been talking to one woman who says health professionals repeatedly refused to accept her elderly mother had the disease.
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Turning colder, but mainly dry with sunshine.
Cold and frosty overnight. Dry, cold and sunny tomorrow.