page_title: Intracranial hemorrhage
section_title: Subdural hematoma
hierarchical_section_title: Intracranial hemorrhage / Types / Subdural hematoma
caption_attribution_description: Diagram of cerebral aneurysm
context_page_description: An intracranial hemorrhage is bleeding in the brain. The most dangerous type of stroke, a hemorrhagic stroke, is a type of intracranial hemorrhage. It is a bleed in the brain that happens when the brain has not been injured.
  When blood vessels in the brain break or are injured, they bleed. Bleeding in the brain is very dangerous, because if enough blood builds up, the blood can squeeze or crush the brain. It can also make it impossible for oxygen to get past the blood to parts of the brain. Without oxygen, these parts of the brain will die.
context_section_description: A subdural hematoma is a collection of blood under the dura mater, between the dura and the arachnoid layer. ("Subdural" means "under the dura.") Usually, subdural hematomas are caused by injuries to the head that tear veins. Because these veins are smaller, and because veins do not bleed as fast as arteries, subdural hematomas may not bleed as quickly as epidural hematomas.
  Subdural hematomas can happen right away after a bad injury to the head. These are called acute subdural hematomas. These are the most dangerous of all head injuries. They kill about 60% to 80% of people who have them.
  Subdural hematomas can also be chronic. This means they take days or weeks to happen. They are usually caused by injuries to the head that are not very bad. Sometimes, if a person has a vein in their dura that slowly leaks blood every now and then, chronic subdural hematomas can take years to build up.
caption: Diagram of a cerebral aneurysm. A hemorrhagic stroke can happen when a cerebral aneurysm bursts, like a popped balloon
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