The causes of sciatica generally fall into two categories. The first is primary sciatica, which is usually caused by inflammation of the sciatic nerve and is relatively rare in clinical practice. The second category is secondary sciatica, which occurs when the tissues and structures around the sciatic nerve undergo pathological changes, leading to stimulation and compression of the sciatic nerve, thus causing secondary sciatica. The majority of secondary sciatica cases are associated with lumbar spine disorders, such as lumbar disc herniation, tumors in the lumbar spinal canal, or degenerative joint disease of the lumbar spine, as well as sacroiliitis. A hospital examination is necessary to make a definitive diagnosis.