May also be called lumbago, referring to pain in the muscles and joints of the<unk>  lasting > 6 weeks is risk factor for more serious disease
Night pain and unrelenting pain are worrisome symptoms<unk>  pain in IV drug user is spinal infection until proven otherwise
95% of herniated discs occur at L4-L5 or L5-S1 (for both pain extends below the knee)
Lower back pain
Spine related
Back pain 
Acute ligamentous injury
Hip pain
Acute muscle strain
Hip pain 
Disk herniation 