Infections of the brain and spinal cord are used by a bacteria or virus. The most common serious problem with the nervous system is stroke. A person may have a stroke if the blood supply to part of the brain is cut off. Then the nerve cells in that area die. The person then may not be able to do the things that are controlled by the damaged area of the brain. Strokes are most common in older adults.
The spinal cord is a bundle of nerves that starts at the base of the brain to the lower back. It runs through the spinal canal and is protected by the bones of the spine. Messages between the brain and the nerves travel up and down the spinal cord. This makes it possible for the brain and body to communicate