Ischemic strokes usually occur when a blood clot forms in a blood vessel in the brain or neck. Blood clots can also travel from other parts of the body, such as the heart, to the neck or brain and cause a stroke. A blood vessel that is extremely narrowed can also cause an ischemic stroke. In hemorrhagic strokes a blood vessel in the brain is leaking or broken. These types of strokes accounts for approximately one out of five strokes.
Hemorrhagic stroke is associated with a higher death rate than ischemic stroke.
Hemorrhage can occur from a weak or thinned out area on the artery wall that balloons out over time, and then ruptures. The right hemisphere of the brain controls the movement of the left side of the body. It also controls analytical and perceptual tasks, such as judging distance, size, speed, or position and seeing how parts are connected to wholes. A stroke in the right hemisphere often causes paralysis in the left side of the body. This is known as left hemiplegia .