You should consult a physiotherapist. This pain can be due to the nerve compression in the back region leading to pain in the thighs or down the legs.
Next Steps
Consult a physiotherapist.. TENS+Heating therapy +traction (may require) +some strengthening as well as stretching exercises will be helpful for sure.
Health Tips
At home.. Rest +no long sitting /standing /travelling /driving +no cold exposure +no manual exertions +no weight lifting +avoid cold exposure +no forward bending.