Symptoms of cerebral congestion are those of cerebral edema, and the three most common main symptoms include headache, vomiting, and optic nerve edema. In addition to manifestations of headache and vomiting, optic nerve edema can be detected through professional funduscopic examination. The causes of cerebral congestion can be analyzed according to the presence of intracranial infection, cerebrovascular disease, traumatic brain injury, brain tumor, or other manifestations of systemic diseases. The degree of cerebral congestion can also be determined based on clinical manifestations such as memory, consciousness, and respiration. Mild cerebral congestion can be relieved with conventional treatment, but in severe cases, cerebral hernia may be formed, which may cause displacement of brain tissues and even endanger life.