Yes, accidents or injuries can cause sciatica. Common causes include a herniated disc from trauma, spinal stenosis (narrowing of the spinal canal), piriformis syndrome (spasms or tightness in the piriformis muscle), spondylolisthesis (a vertebra slipping forward over another), and direct injuries to the lower back or buttocks, such as from car accidents or falls. Degenerative disc disease can also lead to sciatica by causing nerve compression. If you experience sciatica symptoms after an injury, consult a healthcare professional for a proper diagnosis and treatment plan.