small pain in the back - advice- NSAID
( tablet diclofen 50mg twice in a days after meal ) if not relived then tablet predisolone or in severe case injection prednisolone
for investigation- X-RAY LS - AP & lateral, MRI
confirmatory, if not relived then advice dissectomy or lamnectomy, usually relived by NSAID, traction, massage
, electrical , hope my advice useful to you, thank you.