Chronic gastritis and gastroduodenal ulcer, other than occupational diseases are among the most common causes of sick leave among coal miners, due to the unique working and living conditions.

• 煤矿井下工人因为特殊的工作和生活环境，因慢性胃炎，胃和十二指肠溃疡而缺勤的比例较高，是除职业病以外的主要缺勤原因。