Causes of Subarachnoid Hemorrhage

In this article, we will discuss the Causes of Subarachnoid Hemorrhage. So, let’s get started.

Subarachnoid hemorrhage is defined as bleeding into subarachnoid space irrespective of its cause. The condition has a high mortality. It can be traumatic in origin or spontaneous (non-traumatic) caused by the rupture of a saccular aneurysm which is up to 5% in the normal population. Between 5 and 10% of stroke are due to subarachnoid hemorrhage.


Spontaneous (non-traumatic)

  1. Ruptured cerebral aneurysm (congenital or saccular and mycotic)
  2. Arteriovenous malformation
  3. Leakage of intracerebral bleed into subarachnoid space
  4. Hemorrhagic cerebral infarction/hypertensive hemorrhage
  5. Rupture of atherosclerotic vessel
  6. Bleeding or clotting disorder


  1. Skull fracture (cerebral contusion and laceration)
  2. Penetrating foreign body
  3. Bleeding from traumatic AV fistula
  4. Traumatic aneurysm (false aneurysm)




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