Almost one in five adults with no history of a stroke may have had an undiagnosed, or 'silent stroke', research has shown.
The US study finds that out of a random sample of 18,642 adults 17.8% report having one or more symptoms of stroke.
Of the sample questioned using telephone interviews, 8.5% report sudden numbness on one side of the body, 5.8% report sudden weakness on one side of the body, 4.6% experience sudden vision loss in one or both eyes.
A further 2.7% experienced a sudden inability to understand what others are saying and 3.8% were suddenly unable to express themselves in speech or writing, the findings add.
Archives of Internal Medicine (2006) 166:1952-1958