A stroke is a medical emergency. There are two types - ischemic and hemorrhagic. Ischemic stroke is the most common type.
It is sometimes caused by a blood that blocks or plugs a vas within the brain. This keeps blood from flowing to the brain. Within minutes, brain cells begin to die. Another cause is stenosis, or narrowing of the artery.
This can happen due to coronary artery disease, a disease in which plaque builds up inside your arteries.
Transient ischaemic attacks (TIAs) occur once the blood offer to the brain is interrupted in brief. Having a ischemia will mean you're in danger for having a a lot of serious stroke.