高原是一个特殊的生态环境系统。低压、缺氧、低温、紫外线强等因素是导致高原病的主要原因之一。慢性高原缺氧所致疾病是指长期生活在高海拔的世居者或移居者对高原缺氧环境逐渐失去耐受而导致的临床综合征。高原红细胞增多症(high altitude polycythemia,HAPC)是最常见的一种慢性高原病,可引起机体复杂的病理生理改变,患者常常出现一系列消化道 Plateau is a special eco-system. Low pressure, hypoxia, hypothermia, strong ultraviolet radiation and other factors are one of the main causes of altitude sickness. The disease caused by hypoxia in the chronic plateau refers to the clinical syndrome caused by the gradual loss of tolerance of the native or migrants living in high altitude for a long time to the plateaus. High altitude polycythemia (HAPC) is the most common type of chronic high altitude disease that causes complex pathophysiological changes in the body. Patients often have a series of gastrointestinal