Mo so nguoi sanh voi mot LES yeu tu nhien. Voi nhung nguoi khac, thuc an beo, cay, mot so thuoc uong, quan ao chat, hut thuot la, uong ruou, tap the dung manh bao, hay thay doi vi tri cua than hinh ( cuoi xuong, hay nam xuong) co the la nguyen nhan cua LEX de co ran,nguyen nhan cu Reflux.