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流行病学调查显示功能性消化不良（ＦｕｎｃｔｉｏｎａｌＤｙｓｐｅｐｓｉａ ＦＤ）广泛存在，几乎每个人一生中都曾有过消化不良的症状，只是持续时间的长短以及对正常生活影响的程度不同。人群中约有２０％～４０％的人有过消化不良症状，西方国家资料统计ＦＤ约占消化系疾病
Epidemiological studies have shown that Functional Dyspepsia FD is widespread and almost everyone has had indigestion symptoms throughout their lives, differing in both duration and extent of effects on normal life. About 20% to 40% of the population have had symptoms of indigestion, FD data in Western countries accounts for about half of the digestive diseases