1989年，美国芝加哥FD专题会议将功能性消化不良分为5个亚型：反流样消化不良（refluxlikedyspepsia）、运动障碍样消化不良（dysmotilitylikedyspepsia）、溃疡样消化不良（ulcerlikedyspepsia）、吞气症（aerophagia）及特发性消化不良（idiopathicdyspepsia）。
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