The symptoms and hazards of low cranial pressure are as follows: 1. Symptoms: mainly include headache, dizziness, nausea, vomiting, vertigo, tinnitus, etc., of which headache is the most common symptom, the patient’s headache is mainly related to the change of position, when the patient is lying down, the headache symptoms can be reduced, when the patient sits up or upright, the headache symptoms can be significantly aggravated. 2. Hazards: mainly include subarachnoid hemorrhage, intracranial venous sinus thrombosis, and in severe cases, it can also cause patients to become unconscious. In severe cases, it can also cause patients to develop coma and other disorders of consciousness. Therefore, patients with low cranial pressure need to receive timely examination and treatment in neurology, the main means of examination is lumbar puncture cerebrospinal fluid examination, through lumbar puncture can determine the pressure of cerebrospinal fluid, so as to confirm the diagnosis of low cranial pressure. After the diagnosis is clear, treatment should be actively carried out, which mainly includes treatment for the primary disease, as well as extensive rehydration.