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Walk the evidence base by book and chapter — the raw source passages that ground Ask, Differential, and the rest.

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abstractpubmed· Abstract 2020· item PMID:32622451

Lactose Intolerance: A Concise Review to Skim the Surface. Lactose intolerance is a common but poorly understood cause of gastrointestinal symptoms. Contrary to popular belief, there is much more to its diagnosis beyond symptoms with exposure and management beyond milk- and dairy-product avoidance. In this article, we review definitions, genetic basis, pathogenesis, clinical signs, as well as diagnostic and management strategies.