on 7-4-15 employee was taking a guard off and felt a twinge in his back. He reported a stiff back to supervisor. Employees back felt fine the next day and was not treated by a Dr at that time. Employee contacted supervisor on 8-10-15 and wanted to get his back checked by a Dr because it was bugging him. Employee was seen on 8-11-15 and placed on a 15 pound lifting restriction.