A stroke is the rapid loss of brain function due to a lack of blood supply to the brain. This can be due to ischemia (loss of blood flow) caused by a blockage (thrombosis or arterial embolism), or a hemorrhage. The result of this is loss of brain function in the affected area. This may result in an inability to move one or more limbs on one side of the body, inability to formulate or understand speech, or an inability to see one side of the visual field. Stroke may cause permanent damage, or death. A stroke is a medical emergency that requires immediate care. Stroke is the second leading cause of death globally. Strokes are classified as either ischemic or hemorrhagic. ischemic strokes are caused by an interruption of blood supply to the brain, whereas hemorrhagic strokes are caused by the rupture of a blood vessel or an abnormal vascular structure. Roughly 87% of strokes are caused by ischemia. Because ischemic strokes typically are caused by a blockage, a hemorrhage may develop as a result of the increased pressure, and because if this, it is unknown how many hemorrhage strokes actually start as ischemic. For more details on how to recognize and treat a suspected stroke, please feel free to take all the time you need to study our free Adult suspected stroke algorithm.