Hi doctors, was just wondering what is a subarachnoid hemorrhage?

Brain bleeding. Subarachnoid hemorrhage is bleeding in the brain. The location of the blood is beneath the arachnoid layer but above the pia layer. The arteries and veins of the brain run between the pia and subarachnoid layers. Trauma or a ruptured aneurysm are the most common causes of subarachnoid hemorrhage. A neurosurgeon can provide answers as to the cause of the bleeding and the prognosis for recovery.