Children's Hospital Colorado

Lactose Intolerance in Kids

What is lactose intolerance? 

Lactose intolerance is the inability to fully digest lactose, which is the main type of sugar that is found in milk and dairy products.

What causes lactose intolerance in kids?

As people get older, we gradually lose the ability to digest lactose. Lactose cannot be absorbed by the intestines and used in the body unless it is digested. Lactase is the enzyme in our intestinal wall which digests lactose into two smaller sugar particles that are then easily absorbed. 

As we age, lactase production decreases and in some individuals, this leads to lactose intolerance. When lactose is not digested and travels through the intestinal tract, it can lead to the development of symptoms like diarrhea. Undigested lactose is consumed by the bacteria that live normally in our large intestine leading to gas production. 

Who gets lactose intolerance?

Lactose intolerance is extremely rare in infants and young children, who are born with sufficient lactase to digest milk sugar. In older children, adolescents and adults, however, lactose intolerance is a common problem. The frequency of lactose intolerance varies by race and ethnicity, with the lowest occurrence in European Americans and higher occurrence in African Americans, Hispanic Americans, Asian Americans and Native Americans.

Get to know our pediatric experts.

Ed Hoffenberg, MD

Ed Hoffenberg, MD

Gastroenterology - Pediatric

David Brumbaugh, MD

David Brumbaugh, MD

Gastroenterology - Pediatric

Marisa Stahl, MD

Marisa Stahl, MD

Gastroenterology - Pediatric, Pediatrics

Jason Soden, MD

Jason Soden, MD

Gastroenterology - Pediatric