The causes of left-sided sciatica may be several: 1, lumbar disc herniation, if the lumbar disc herniation compression sciatic nerve will lead to sciatica after, so that the buttocks, lower limbs have radiating pain, treatment can be given Si for Pu pain, lumbago capsules to relieve pain, physical therapy to relieve pain. 2, pear muscle syndrome, if long-term cold or overexertion will lead to aseptic inflammation of the pear muscle, stimulating the peripheral nerve after triggering pain. If you have a history of herpes zoster, there may be sequelae after cure, mainly nerve pain, treatment can be given to Siweipu for pain relief and Micropo to nourish the nerves. 4, pelvic tumor, if there is a tumor in the pelvis will also compress the sciatic nerve, resulting in left sciatic pain.