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<p>Lactose intolerance is due to the lack of&nbsp;<a href="https://en.wikipedia.org/wiki/Enzyme" title="Enzyme">enzyme</a>&nbsp;<a href="https://en.wikipedia.org/wiki/Lactase" title="Lactase">lactase</a>&nbsp;in the&nbsp;<a href="https://en.wikipedia.org/wiki/Small_intestines" title="Small intestines">small intestines</a>&nbsp;to break lactose down into&nbsp;<a href="https://en.wikipedia.org/wiki/Glucose" title="Glucose">glucose</a>&nbsp;and&nbsp;<a href="https://en.wikipedia.org/wiki/Galactose" title="Galactose">galactose</a>.&nbsp;There are four types: primary, secondary, developmental, and congenital.&nbsp;Primary lactose intolerance occurs as the number of lactase declines as people age.<span style="font-size:10.8333px"> </span>Secondary lactose intolerance is due to injury to the small intestine such as from infection,&nbsp;<a href="https://en.wikipedia.org/wiki/Celiac_disease" title="Celiac disease">celiac disease</a>,&nbsp;<a href="https://en.wikipedia.org/wiki/Inflammatory_bowel_disease" title="Inflammatory bowel disease">inflammatory bowel disease</a>, or other diseases.<span style="font-size:10.8333px"> </span>Developmental lactose intolerance may occur in&nbsp;<a href="https://en.wikipedia.org/wiki/Premature_babies" title="Premature babies">premature babies</a>&nbsp;and usually improves over a short period of time.&nbsp;Congenital lactose intolerance is an extremely rare&nbsp;<a href="https://en.wikipedia.org/wiki/Genetic_disorder" title="Genetic disorder">genetic disorder</a>&nbsp;in which little or no lactase is made from birth.</p>

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