Lumbar pain may be caused by lumbar spine fracture, lumbar muscle strain or lumbar spondylosis, etc. There is no fastest way to relieve pain, and you need to choose intramuscular pain injection or oral pain medication according to the cause of the disease. 1. Lumbar spine fracture: most of the lumbar spine fracture caused by back pain symptoms, and more intolerable, at this time the most effective pain relief measures for intramuscular or intravenous injection of pain medication, such as parecoxib sodium injection, dizocin injection, or strong analgesic drugs such as pethidine hydrochloride, morphine and so on. 2. Lumbar muscle strain: for lumbar muscle strain caused by back pain generally oral pain medication can be significantly relieved, such as oral diclofenac sodium, bisacodyl, and so on. For the acute stage of lumbar muscle strain injury may need oral weak opioid drugs such as tramadol, codeine and other drugs to improve the back pain. 3. Lumbar spondylosis: such as lumbar disc herniation, lumbar spondylolisthesis, etc., generally can be oral non-steroidal anti-inflammatory analgesic drugs such as indomethacin, celecoxib, meloxicam, etc., severe pain can be oral morphine hydrochloride tablets, hydrocodone hydrochloride extended-release tablets and other medications to relieve. As the causative factors of back pain are more, it is recommended to consult the hospital in time, after clarifying the condition, use the above drugs or comprehensive treatment under the guidance of the physician.