He was diagnosed with otitis media, but the medication had no effect, and he took Chinese medicine for two months, but there was no improvement. It was not until recently that he went to the hospital with more and more flowing water that he found out that it was cerebrospinal fluid leakage from the ear. He has recently undergone a cerebrospinal fluid ear leak repair in the hospital and is recovering well. Although cerebrospinal fluid leakage does not necessarily cause harm to the body, it means that the brain tissue is connected to the outside world through the fissure, and if care is not taken, bacteria can easily enter the skull through the fissure retrogradely causing diseases such as meningitis, which can be life-threatening. The human brain is filled with cerebrospinal fluid, which is normally generated and absorbed, and once the meninges are broken, the cerebrospinal fluid will flow through the break into the sinus cavity because the skull base is connected to the middle ear and the nasal cavity. Cerebrospinal fluid aural leakage is divided into two categories: traumatic and spontaneous. Traumatic aural leakage occurs mainly when the meninges are broken or the intracranial pressure is increased due to head and facial trauma or head and facial surgery; spontaneous aural leakage of cerebrospinal fluid occurs for unknown reasons after the natural rupture of the meninges due to sudden force, such as sneezing or sudden bending and lowering of the head. In clinical practice, cerebrospinal fluid ear leakage is easily misdiagnosed as otitis media, while cerebrospinal fluid nasal leakage is easily confused with rhinitis and other diseases. It is reported that the overflow in patients with otitis media is often mucus, paddle or purulent, with different colors such as yellow and green. The overflow is clear water-like, especially after ear and cranial trauma, and more clear water flows out when turning sideways to the affected ear, lowering the head, or coughing, the possibility of having cerebrospinal fluid ear leakage is higher. In addition, the cerebrospinal fluid contains a large amount of glucose, so a quantitative sugar test of the clear water flowing from the cerebrospinal fluid can confirm the diagnosis. If detected early, most patients with cerebrospinal fluid leakage can be cured with conservative treatment, the simplest treatment being absolute bed rest, and the meninges can repair themselves. If it does not heal after 4 to 8 weeks of conservative treatment, cerebrospinal fluid ear leak repair should be performed. Director She also reminds patients that if they find fluid in their ears, they should not use cotton balls or toilet paper to plug the ear canal until the diagnosis is confirmed, as this can easily lead to the risk of intracranial infections such as meningitis.