section_path: Classification
section_name: Classification
paragraph_text: Classification
  
  Stroke can be classified into two major categories: ischemic and hemorrhagic. Ischemic stroke is caused by interruption of the blood supply to the brain, while hemorrhagic stroke results from the rupture of a blood vessel or an abnormal vascular structure.
  
  About 87% of stroke is ischemic, with the rest being hemorrhagic. Bleeding can develop inside areas of ischemia, a condition known as " hemorrhagic transformation." It is unknown how many cases of hemorrhagic stroke actually start as ischemic stroke.