Dear lybrate-user Ji
Lower back pain
is because of so many reasons Starting from simple postural problem to compression at nerve roots One of d most common one is L4-5 disc disease For seeking a relevant advice you need to answer few questions, Has to undergo proper set of specific tests to rule out certain specific disorders.
Every case needs a detailed understanding through certain investigations and evaluations.
However rest/ hot fomentation and few days of muscle relaxants usually works well The good news is - its always treatable if timely addressed Good luck.