My husband is feeling a light pain on the right hand side behind his back where his kidney is for the past 2 weeks - he has had 2 kidney stones before - could this be another kidney stone?

Kidney stone: Yes . May also be gallbladder - unusual in back , sciatica, infection, rarely intestinal/ appendix. Follow up with MD, they could do a urine test and or ultrasound to assess the issue. Also if a stone check the type , oxalate, urate acid as some foods precipitate stones Drink fluids - that helps pass/ prevent stones. https://www.kidneyfund.org/kidney-disease/kidney-problems/kidney-stones/