While operating 3331 600 loader EE's back began to hurt and right leg went numb. Did not want to see the Dr. and continued to work as EE saw improvement. On 3/10/2022 EE was in pain and wanted to see a Dr. EE went to the ER on 3/11 and was removed from work at that time. Became MSHA reportable with missed day on 3/11/22.