功能性消化不良的患儿主诉各异，又缺乏肯定的特异病理生理基础，因此，对这一部分患者，曾有许多命名，主要有功能性消化不良、非溃疡性消化不良（nonulcerdyspepsia，NUD）、特发性消化不良（idiopathicdyspepsia）、原发性消化不良（essentialdyspepsia）、胀气性消化不良（flatulentdyspepsia）以及上腹不适综合征（epigastricdistresssyndrome）等。
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