Most of the increased intracranial pressure is caused by hypoxia and increased osmotic pressure in brain cells, resulting in brain cell edema. There are various diseases that cause increased intracranial pressure, such as massive cerebral hemorrhage, massive cerebral infarction, severe encephalitis, severe craniocerebral trauma, cerebral parasitic infection, and brain tumor can be caused. It can also occur if the patient has hypertensive encephalopathy. Carbon monoxide poisoning, when severe, can cause carbon monoxide toxic encephalopathy, which can also cause increased intracranial pressure. If the patient has diabetes mellitus, hyperglycemia may cause hyperosmolar encephalopathy, which can also cause increased intracranial pressure. Severe increased intracranial pressure may cause brain herniation, leading to the patient’s death. In the presence of increased intracranial pressure, patients may experience headache, nausea, vomiting, and may also develop optic papilloedema.