An ischemic stroke is the most common form of stroke, and it occurs when blood clots or other debris obstructs an artery leading to the brain. This prevents the brain tissue from receiving the oxygen and other nutrients it requires to function.
A hemorrhagic stroke occurs when a ruptured artery begins to leak blood into the brain which puts excessive pressure onto the brain cells, causing the cells to become damaged.
A transient ischemic attack (TIA or “ministroke”) similar to a stroke, the blood supply is interrupted long enough to result in injury but the blood supply resumes quickly enough that the brain tissue is bruised but not killed. While TIAs do not lead to any lasting damage, they are concerning as they indicate another event, perhaps more permanent may be coming.