Hello,
As Dr. Vaibhav has already pointed out, it can be due to faulty posturing. Or it can even be Nerve compression.
Next Steps
Try over the counter analgesic after consulting with your family doctor ,( if not allergic to them or if you don't have any
kidney problems).
and Hot fomentation thrice a day on the affected area.
Health Tips
Try finding out which movement is triggering the pain.