You might have spotted the FAST advert on the TV or online during October 2015.
The Stroke Association is working closely with Public Health England to make sure as many people as possible know the signs of stroke.
Do you know the FAST message? Acting FAST saves lives and ensures a better chance of recovery.
Watch Public Health England's television advert below.
The FAST test
Recognising the signs of stroke or mini-stroke and calling 999 for an ambulance is crucial. The quicker a patient arrives at a specialist stroke unit, the quicker they will receive appropriate treatment and the more likely they are to make a better recovery.
Stroke occurs approximately 152,000 times a year in the UK; that's one every 3 minutes 27 seconds. First-time incidence of stroke occurs almost 17 million times a year worldwide; one every two seconds.
If you suspect a stroke, always dial 999.