What is more severe, subdural or epidural hematoma?

Brain Bleed: An epidural hematoma is a brain bleed occurring outside of the brain but within the skull. This accumulation of blood can cause an increase in pressure within the skull leading to brain herniation if untreated.

Depends: If you are referring to outcomes, subdural hematomas generally have a worse outcome. This may because these tend to be in older patients and are associated with a rotational component. The blood is also pushing directly on the brain. If you are referring to rapidity of deterioration although both can have a rapid decline, classically, the epidural is more rapid because it is an artery bleeding.