There is no such thing as the best clinical treatment for left-sided lumbar muscle strain. Left side lumbar muscle. Strain injury can be given medication, massage physiotherapy, lumbar back muscle exercise, change bad posture and other treatments. 1. medication: severe pain can be given ibuprofen, indomethacin, celecoxib and other pain relieving and anti-inflammatory drugs but should not be taken for a long time. 2. Massage and physiotherapy: massage, massage, physiotherapy such as infrared ray and ultra-short wave and other treatment methods can be given. 3. Exercise for lumbar and back muscles: Strengthening the functional exercise of lumbar and back muscles can improve the blood circulation of the muscles, which is beneficial to the responsiveness and strength of the muscles, the loosening of soft tissue adhesions, and the adjustment of internal and external balance of the spine. 4. Change the bad posture: maintain good sitting and standing posture, avoid high intensity physical activities in the waist, localized braking and so on. After the occurrence of lumbar muscle strain in daily life should pay attention to the care, work and rest to avoid prolonged lumbar force, to standardize the treatment can not be self-medication.