A Cerebrospinal Fluid (CSF) Leak occurs when there is a tear or hole in the membrane that surrounds the cerebrospinal fluid (CSF), the clear fluid that cushions and protects the brain and spinal cord. When a CSF leak happens, the fluid escapes, which can lead to a range of symptoms, such as headaches, neck stiffness, nausea, and dizziness. This condition can arise due to head trauma, spinal surgery, or conditions that weaken the protective layers around the brain and spine.