Hugh Allen, 48, is believed to be suffering from dementia or some other cognitive impairment.
Allen is described as a black man standing 5 feet 8 inches and weighing 185 pounds with brown eyes.
He was last seen at an apartment on Gorman Street in Raleigh, authorities said.
Anyone with information about Allen should call the Raleigh Police Department at 919-996-3335.
Developed in 2007, Silver Alert is a system to quickly notify the public about missing endangered adults who suffer from dementia or other cognitive impairments, such as Alzheimer's disease.
It also allows caregivers and nursing homes to report a person missing. In the past, only a family member could report an adult missing.
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