It can be due to nerve compression which generally occurs in disc bulge case of the back region, lrads to pain the back, hip and travel down to the leg.
Next Steps
Go to a physiotherapist.. Ultrasonic therapy +IFT +Heating therapy +some strengthening exercises as well as stretching exercises will be helpful for sure.
Health Tips
At home.. Rest +hot water fomentation +pain killer gel +no long sitting /standing /walking /stair/travelling /driving +no cold exposure +no manual exertions +no weight lifting +no jerks to +no stair climbing +sit tall.