Ischaemic (blocked artery) - this is when a artery to the brain becomes blocked and does not allow blood to flow to the brain. The tissue around the centre of the clot will started to die and if oxygen does not reach the brain within a few minutes the rest of the blocked area will start to die. This is the most common type of stroke.
Haemorrhagic stroke (brain bleed) - this is when a blood vessel ruptures in the brain. The blood spurts under high pressure causing a tear in the soft tissue. The brain is then squashed by a blood clot which is formed because of the rupture.