Awareness must be raised of two lesser-known signs that someone is having a stroke, researchers say.
A study found that leg weakness and loss of vision were largely unknown signs of a stroke.
While the majority of people surveyed knew to look out for symptoms used in the NHS FAST campaign - facial weakness, arm weakness and speech problems - just 57% considered leg weakness to be a symptom and 44% loss of vision.
The University Hospital of NHS Trust hopes to raise awareness of the signs, and remind people of the importance of calling 999 as soon as possible. Nurses will play a fundamental role in this process.
Carried out as part of a two-year innovation award funded by the East Midlands Strategic Health Authority, the trust surveyed 1,300 people in Leicestershire. Prof Naylor, who is based at the Leicester Royal Infirmary, said people needed to be aware of all five signs.