A Cerebrospinal Fluid (CSF) Leak is a leak of the fluid that surrounds the brain and spinal cord. Tears or holes in the membrane that surrounds the brain and spinal cord cause CSF leaks. Tears can be a result of various causes such as head injury or surgery, and spinal taps. Symptoms of a CSF leak may include: light sensitivity, nausea, neck stiffness, and drainage of CSF fluid from the ears or nose. CT scans and MRIs of the head or spine can diagnose this condition. CFS leaks may go away on their own after a few days, depending on their cause. Patients are recommended to go on bed rest and drink many fluids. Headaches can be treated with painkillers, and surgery to repair the leak is rarely necessary.