<unk>  is a serious medical emergency because the buildup of blood within the skull can lead to increases in intracranial pressure, which can crush delicate brain tissue or limit its blood supply. Severe increases in intracranial pressure (ICP) can cause brain herniation, in which parts of the brain are squeezed past structures in the skull.
Intracranial hemorrhage
Intracerebral hemorrhage
Subarachnoid hemorrhage
Epidural hematoma
Intracranial hypertension syndrome
Brain herniation
Brain ischemia
Hemarthrosis