Employee was helping load bolts on roof bolter on 1 section. As he loaded the bolts he said he felt a pain in lower back. He did not go to see doctor, and continue to work every day till Oct 6. He never said anything the whole time or on Oct 6 about back hurting. He called us Oct 7th, and said his doctor had him off on the strain from the 9-14-2015 incident.