Chronic epidural hematoma is rare and refers to hematoma that occurs more than 2 to 3 weeks after injury. Generally speaking, more than 13 days after injury, the hematoma begins to calcify, which can be used as the basis for the diagnosis of chronic hematoma. This disease is more common in young men, probably because the dura mater is not as tightly attached to the skull as women, children and the elderly, and is easy to peel off. The common sites are just the opposite of acute epidural hematoma, that is, they are mostly located in the forehead, top, occipital, etc., and less in the temporal area. The reason is that hematoma in the temporal area is prone to brain herniation, so the course of the disease progresses faster.