Which type of stroke occurs due to a blockage in blood flow?

An ischemic stroke occurs when a blood vessel supplying blood to the brain is obstructed, most commonly due to a blood clot. This blockage prevents essential oxygen and nutrients from reaching brain cells, leading to cell death and functional impairments. Ischemic strokes are the most prevalent type, accounting for about 87% of all strokes. Early recognition and treatment are vital in reducing brain damage and improving outcomes.

The other types of strokes referenced in the options involve different mechanisms. Hemorrhagic strokes, for instance, occur due to bleeding in the brain, often from a ruptured aneurysm or other blood vessel problems. A transient ischemic attack (TIA) is sometimes referred to as a "mini-stroke," which also involves a temporary blockage of blood flow but resolves on its own without lasting effects. The term "functional stroke" is not a recognized medical term in the context of strokes. Understanding these distinctions is crucial for recognizing the importance of swift intervention in ischemic strokes, where clot removal or dissolution can drastically improve prognosis.