EE was shoveling coal from around belt structure & lost his balance & fell against belt structure - 30"" coal seam - 2 other employees were there at that time & asked him if he was ok. He replied he was ok & continued work. Asked him if he wanted to go to dr & he said No - however he changed his mind & went. He was off for 2 days. Has a history of missing 1 to 2 days per week