Cerebral contusions causing coma are very serious and are often the result of extensive and severe cerebral contusions or secondary edema or hematoma causing brain herniation. A cerebral contusion is an injury to the brain or cerebellar cortex that includes rupture of the soft membranes, blood vessels, and brain tissue of the brain, along with possible traumatic subarachnoid hemorrhage. Cerebral contusions are often serious injuries to brain tissue, and after the injury usually cause cerebral edema and cerebral hematoma, which become increasingly severe within a few days, squeezing other brain tissue and causing other brain tissue damage, reaching a peak in 3-7 days. The increasing severity of cerebral hematoma and edema will cause higher and higher pressure in the brain, even causing brain herniation and coma by compressing the brainstem. From this process, it can be understood that brain contusions causing coma often represent a condition that has progressed to a very serious stage.