

It can last a few minutes or persist up to 24 hours. This causes what's known as a mini-stroke. There's also a related condition called a transient ischaemic attack (TIA), where the blood supply to the brain is temporarily interrupted.

This can lead to brain injury, disability and possibly death. If the supply of blood is restricted or stopped, brain cells begin to die. Like all organs, the brain needs the oxygen and nutrients provided by blood to function properly. Time – it's time to dial 999 immediately if you see any of these signs or symptoms.Speech – their speech may be slurred or garbled, or the person may not be able to talk at all despite appearing to be awake they may also have problems understanding what you're saying to them.

