The onset of Sciatica can be triggered by any number of events. Sitting at a desk for an extended period can cause symptoms. In addition, a traumatic event such as a slip and fall or an automobile accident can result in sciatic pain. Because the Sciatic Nerve is long and discomfort can occur at any point along its length, pain may shift locations and may radiate, shoot, stab, or merely ache, depending on where the pressure is on the nerve.