Having moderate flank pain in the right side. No burning or blood on urination. Don't think it's muscular. Mostly sore, rarely sharp. Problem?

Flank pain. Fever associated, sweats or chills, diarrhea? Still may be kidney stones or urine infection - blood may be present, just not visible to the eye. Pulled muscle and bowel issues are still possible. If it is skin tenderness - may even be start of shingles. Fluids and rest - follow up with your physician if persisting or worsening.