ABSTRACT
The meninges, proximal cerebral blood vessels, and venous sinuses are pain sensitive. Therefore, it is not surprising that subarachnoid hemorrhage from a ruptured aneurysm or vessel distension from a venous thrombosis would produce head pain. Pus and subarachnoid blood act as irritants, setting up an inflammatory reaction and potentially interfering with CSF reabsorption, causing hydrocephalus.
