WHILE EMPLOYEE WAS CLEANING ALONG D-53 BELT HE WAS SHOVELING MATERIAL FROM THE FLOOR TO THE BELT WHICH IS ABOUT SHOULDER HIGH. HE FELT A TUGIN THE AREA OF HIS L. BREAST. DURING THE EVE.HRS THE EMPLOYEE FELT THAT THIS AREA WAS GETTING TIGHTER AND UPON RETURNING TO WORK ON 11-20-01 HE REQUESTED A CHECK BY A DR.