The main cause of your lower back is repeated strain to your spine. It mostly happens when you sit for long hours as in office work or long travel. Others facors like bending down for long hours and also lifting weights. I suggest you try getting bed rest for 1 week or more along with some hot packs and spine strengthening exercise
Next Steps
bed rest for 1 week or more
Health Tips
spine strengthening exercise
avoid lifting weight
bending down
squating
sitting for long hours