It can be due to muscular weakness which generally occurs in case of of overuse or of the muscles. The cause is long sitting /standing as in computer work /table work /studies /travelling. Consult a physiotherapist.
Next Steps
Go to a physiotherapist.. Ultrasonic therapy +IFT +Heating therapy +some strengthening 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 /travelling /driving /walking +no stair climbing +no cold exposure +no manual exertions +no weight lifting +postural correction (sit tall).