Nerve damage can occur after any injury, with the results often being related to the severity of the injury. Minor injuries may cause some nerve damage, but your body tries to heal itself whenever possible. However, more serious injuries can cause severe nerve damage which often requires nerve repairs. Nerves are made up of fibers, which are also called axons. These fibers are covered with tissues that act as a type of insulation. Sometimes, after an injury, only the fibers are damaged. In the more serious scenarios, both the fibers and tissues are damaged. In some cases, the nerve is completely cut.