Sciatica may be caused by acute trauma, lumbar spine lesions, pyriformis syndrome, diabetes and other factors. 1. Acute trauma: for example, external blows or traffic accidents may cause damage to the sciatic nerve, which will easily cause sciatica, and may be accompanied by swelling, subcutaneous bruising or bleeding and other symptoms. 2. Lumbar spine lesions: for example, lumbar disc herniation, lumbar spine osteophytes, lumbar spine slippage, etc., which may cause pressure on the nerve root, and it is easy to induce sciatica. 3. Piriformis syndrome: As the sciatic nerve usually passes under the piriformis muscle, chronic strain or acute injury to the piriformis muscle may cause compression and irritation to the sciatic nerve, which may easily trigger sciatica. 4. Diabetes: diabetes itself, improper medication, blood sugar increases repeatedly, may induce peripheral neuropathy, easy to make the sciatic nerve damage, can cause sciatica. After the symptoms of sciatica appear, it is recommended to consult a doctor as soon as possible for examination and treatment to avoid continuous aggravation of the lesion.