Which type of stroke is caused by a blockage?

An ischemic stroke occurs when a blood vessel supplying blood to the brain is obstructed, typically by a blood clot. This blockage can prevent vital nutrients and oxygen from reaching brain tissue, leading to cell death and potentially resulting in significant neurological damage. Ischemic strokes account for approximately 87% of all strokes, highlighting their prevalence.

In contrast, a hemorrhagic stroke results from a rupture of a blood vessel, leading to bleeding within the brain, rather than a blockage. Transient ischemic attacks (TIAs), sometimes called "mini-strokes," cause temporary disruptions in blood flow but do not result in permanent damage. The term "severe stroke" is not a specific medical category and does not define a stroke type based on its cause.

Understanding these distinctions is important in identifying and responding appropriately to different types of stroke emergencies.