Spinal fluid, also known as cerebrospinal fluid (CSF), does not normally leak out of the nasal passages; a fracture of the base of the skull may cause CSF to flow out of the nasal passages. Cerebrospinal fluid is generally found in the ventricles and subarachnoid space, which serves to relieve pressure on the brain and spinal cord, and does not normally leak out. If trauma fractures the base of the skull, resulting in meningeal tears, pterygoid injuries, and temporal bone injuries, symptoms of cerebrospinal fluid leakage from the nose can occur, often with a clear, colorless, watery fluid that flows with changes in head position, and the diagnosis can be confirmed through laboratory, imaging, and specialty testing. When the above symptoms occur, it is important to go to the hospital in a timely manner. You should not block the nasal cavity with anything or perform nasal irrigation to avoid intracranial infection. Avoid stimuli such as hard coughing and sneezing. After systematic examination to clarify the cause of the disease and the lesion site, take standardized treatment, fistula can be healed after self-repair or surgical treatment.