Sciatic pain may be caused by acute injury, lumbar disc herniation, pyriformis syndrome, diabetic peripheral neuropathy and other factors. 1. Acute injury: when there is an acute injury in the sciatic area, such as an external blow or injury, so that the sciatic nerve is damaged, it will cause symptoms of sciatic pain, which may also be accompanied by swelling and subcutaneous bruising. 2. Lumbar intervertebral disc herniation: it may be related to lumbar degeneration, trauma and other factors, which can make the intervertebral disc herniation and compress the sciatic nerve, which will cause sciatic pain, accompanied by radiating pain in the lower limbs, numbness of the lower limbs and other symptoms. 3. Piriformis syndrome: it may be related to long-term strain, poor posture, trauma and other factors, which may cause damage to the piriformis muscle, excessive compression and stimulation of the sciatic nerve, which will cause sciatic pain. 4. Diabetic peripheral neuropathy: prolonged diabetes may lead to peripheral nerve damage, causing peripheral neuropathy, which will induce sciatic pain. If the sciatic pain lasts for a long time or there are other abnormalities, it is necessary to consult a doctor for examination and treatment in time to avoid delaying the condition.